Ecologica Montenegrina 41: 15-34 (2021) This journal is available online at: www.biotaxa.org/em http://dx.doi.org/10.37828/em.2021.41.4

Bugs (Heteroptera) of treeless areas of Chukotka (Russia)

NIKOLAY N. VINOKUROV1* & OLGA A. KHRULEVA2

1Institute for Biological Problems of Cryolithozone, Siberian Branch RAS, 677980 Yakutsk, 41 Lenin Av., Russia *Corresponding author: E-mail: [email protected] 2A.N. Severtsov Institute of Ecology and Evolution RAS, Leninsky pr. 33, Moscow, 119071, Russia. E-mail: [email protected]

Received 4 March 2021 │ Accepted by V. Pešić: 26 March 2021 │ Published online 4 April 2021.

Abstract The article summarizes the data on bugs in the treeless areas of the Chukotka Autonomous Okrug (tundra zone and the elfin wood subzone). Taking into account the available literary sources, as well as new materials (obtained in 2010s), 62 species of Heteroptera from 41 genera and 12 families are known here; 18 species recorded for these landscapes for the first time and 11 — for the Chukotka AO as a whole. There are: Saldula fucicola (J. Sahlberg, 1970) (Saldidae), Acompocoris brevirostris Kerzhner, 1979 (Anthocoridae); Apolygus lucorum (Meyer-Dür, 1843), Leptopterna ferrugata (Linnaeus, 1758), Teratocoris saundersi Douglas et Scott, 1869, Plagiognathus obscuriceps (Stål, 1858), Plagiognathus pini Vinokurov, 1978, Psallus anticus (Reuter, 1876) (Miridae); Kleidocerys resedae (Panzer, 1797) (Lygaeidae); Aelia frigida Kiritshenko, 1926, Rhacognathus punctatus (Linnaeus, 1758) (Pentatomidae). The number of known Heteroptera species for the tundra region of Chukotka increased from 39 to 51; for the elfin wood subzone — from 10 to 32 species. Some distribution features of bug species within zonal and climatic gradients of Chukotka are revealed.

Key words: Heteroptera, Far East, Chukotka Autonomous Okrug, tundra zone, elfin wood subzone, fauna, new record, habitat distribution.

Introduction

Heteroptera is a large order of Hemimetabola sucking insects, with 40,000 species in the worldʼs fauna, whose taxonomic diversity decreases dramatically north of the forest boundary (Kiritshenko 1960; Chernov 1978; Danks 1981; Scudder 1997; Vinokurov 1998). The article summarizes the results of long-term studies of Heteroptera inhabiting treeless areas of the mainland of Chukotka Autonomous Okrug. The first mention of a bug from this region (Chiloxanthus stellatus Curt. listed as Salda borealis Stål) is given in an article by J. Salberg (1887); it was later included in the report Hemiptera and Anoplura of Arctic Eurasia and America (Breddin 1902). Then Kirichenko (1926) noted for Chukotka Chiloxanthus arcticus J. Sahlb., Anthocoris limbatus Fieb. (as Anthocoris nemorum F.), Lygocoris rugicollis Fall. and Lygus rugulipennis Popp. Later, in a generalizing work on the Heteroptera of the Arctic part of Russia (Kirichenko 1960), he added 7 more species for the Chukotka fauna: Callicorixa producta Reut., Calacanthia trybomi J. Sahlb., Salda littoralis L., Orthotylus artemisiae J. Sahlb., Chlamydatus wilkinsoni Dgl. Sс., Aradus lugubris Fall., Nysius ericae groenlandicus Zett.

Ecologica Montenegrina, 41, 2021, 15-34

BUGS OF TREELESS AREAS OF CHUKOTKA

In subsequent years, information about bugs in Chukotka continued to accumulate (Matis 1986; Kerzhner 1988; Vinokurov et al. 1988; Vinokurov 1990, 2005a, b, 2009, 2014; Marusik 1993; Shuh et al. 1995; Berman 2001; Berman et al. 2002; Kanyukova 2006; Kanyukova & Vinokurov 2009). Some of these publications (Vinokurov et al., 1988; Berman, 2001) indicated the presence of species in the region without data on their location. The most significant contribution in this study was made by Matis (1986), who particularly expanded the list of bugs of the tundra and north taiga landscapes of Western Chukotka (17 species in the vicinity of the Chaunsky Bay and 42 in the Omolon River basin, respectively). Total for the entire period of research (about 150 years) 68 species of bugs have been recorded on the territory of the Chukotka Autonomous Okrug (44 — from treeless areas of this region). All this data were contained in the faunal reports of larger regions or in taxonomic and ecological articles. This paper summarizes information about Heteroptera in treeless areas of Chukotka on the basis of field research materials, literature sources, as well as collections of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg (hereinafter — ZIN) and of the Institute for Biological Problems of Cryolithozone, Siberian Branch RAS, Yakutsk (hereinafter — IBPC).

Material and methods

Chukotka Autonomous Okrug (further Chukotka) is located in the extreme north east of Asia and includes the Chukchi Penunsula, neighboring areas in the continent, and some islands (Wrangel, Ayon, Ratmanova and others). It is bounded by East-Siberian and Chukchi Seas to the north and the Bering Sea to the east. This territory has diverse climatic conditions due to its geographic position, the influence of two oceans, the complex atmospherical circulation, and a diverse relief. Chukotka AO is situated in the arctic (along the northern sea coast) and subarctic climate zones. Within the territory, climate conditions vary from maritime on the north-eastern and eastern coasts to continental in the west coastal and interior sections. The mean January temperature varies from –18°C to –42°C, the mean July temperature from 4 to 14°C, and the annual rainfall precipitation varies from 200 to 500 mm. The winter lasts 10 months and vegetation grows for only 80–100 days, even in the southern part. The permafrost is abundant on a majority part of this area. A mountainous relief predominates, with lowlands only occupying coastal areas and large river valleys (e.g., Anadyr River). The territory of Chukotka includes the tundra zone, as well as elfin wood subzone and northern taiga (Yurtsev et al. 2010). The article presents only information about bugs of treeless (without northern taiga) landscapes, where a large new material was collected (Fig. 1). An analysis of their distribution is given using the administrative division of this territory, since the main material (both previously assembled and new) was obtained only from certain areas. In the western Chukotka with most continental climate (Continental-Chukchi Subprovince by floral division (Yurtsev et al., 2010)), bugs were collected in the Chaunsky District and in one locality of Iultinsky District (Bolshaya Osinovaya River). In Beringium- Chukchi Subprovince, they were collected in the eastern part of the Iultinsky District (Central Chukotka with a transitional climate) and from Chukotsky District lies on Chukchi Peninsula in the marine climate area. In the Southern-Chukchi Subprovince material was collected in the Anadyr District. The article includes the material on Heteroptera collected by the second author in 2011 and 2013, as well as specimens obtained at different times for the study of I.M. Kerzhner (ZIN, St. Petersburg) and the first author from D.I. Berman, Yu.M. Marusik, S.P. Bukhkalo and A.V. Stekolshchikov. In addition, at the request of the second author, the collection of bugs was carried out by N. I. Vartanyan and A. G. Dondua in 2015 during ornithological research in northern Chukotka. The main part of the studied material was collected in the localities indicated below (their zonal position is given by Yurtzev et al. 2010). Localily 1. Chaunsky District, environs of Pevek (subzone of the middle hypoarctic tundra). Material (about 800 specimens) was collected by O.A. Khruleva in late May–July 2011 using pitfall traps, sweep nets, sifting litter and hand collection. Five areas were studied. The first of them, the lower course of the Apapelgyn River, 20 km NE of Pevek (69º48ʹ N, 170º39ʹ E), is located in a flat landscape (Fig. 2). The rest areas located within a small mountain range on the peninsula (Fig. 3, 4). There are: Yanrapaakenay Hill, 1 km N of Pevek, 69º42ʹ N, 170º21ʹ E; Pekiney Hill, 1 km S of Pevek, 69º40ʹ N, 170º16ʹ E; Pekiney Hill, 7 km S of Pevek, 69º38ʹ N, 170º15ʹ E; vicinity of the Valkumey village, 18 km S of Pevek, 69º36ʹ N, 170º13ʹ E.

16

VINOKUROV & KHRULEVA

Figure 1. Collection points of Heteroptera on the mainland part of Chukotka. 1 — vicinity of Pevek; 2 — middle course of the Palyavaam River; 3 — Bolshaya Osinovaya River; 4 — Belyaka Spit; 5 — lower course of the Anadyr River; 6 — environs of Beringovskiy vill.; 7 — Vulvoveem River; 8 — Egvekinot vill.; 9 — middle course of the Amguema River; 10 — middle course of the Chegitun River; 11 — Markovo vill.; 12 — Utesiki; 13 — Anadyr town. Large circles are the main gathering points, small circles — the other points. The solid line is the boundary of the subzone of the northern taiga, the dotted line — the elfin wood subzone (by Yurtzev et al. 2010). Abbreviation of the zonal divisions: NT — the northern taiga subzone, EW — the elfin wood subzone; TZ — the tundra zone.

Locality 2. Chaunsky District, middle course of Palyavaam River, 68°35ʹ N, 174° E (subzone of southern hypoarctic tundra). Bugs were collected by D.I. Berman in June 2011, about 75 specimens in total. Locality 3. Iultinsky District, Bolshaya Osinovaya River (on the maps of Chukotka it is designated as Left Telekay, personal communication of Yu.M. Marusik), Telekay Grove area, 67°44ʹ N, 178°44ʹ E. The study area contains a floodplain forest enclave from Chosenia arbutifolia in the close intermountain valley, located within of the middle hypoarctic tundra subzone. Bugs were collected by Yu.M. Marusik in July 1989, and by Yu.M. Marusik and D.I. Berman in June–July 1991. The material collected in 1989 was partially published without detailed label data (Marusik, 1993). This article includes the data of bug labels (about 20 ex.) stored in the collection of the ZIN, St.-Petersburg. Locality 4. Chukotsky District, Kolyuchin Bay, northwestern part of the Belyaka Spit, 67°04ʹ N 174°36ʹ E (subzone of middle hypoarctic tundra). The bugs were collected by N.I. Vartyanian and A.G. Dondua in June–August 2015 using pitfall traps, about 5000 specimens in total. Locality 5. Anadyrsky District, lower course of Anadyr River (22 km above the mouth), environs of Amochi Mt, 64º50ʹ N, 175º58ʹ E (subzone of large elfin trees, Fig. 5, 6). Material was collected by O.A. Khruleva in July–August 2013 using pitfall traps, sweep nets, sifting litter and hand collection (about 100 specimens in total).

Ecologica Montenegrina, 41, 2021, 15-34 17

BUGS OF TREELESS AREAS OF CHUKOTKA

Figure 2. Environs of Pevek, the lower course of the Apapelgyn River, wetland. Photo by O.A. Khruleva.

Figure 3. Environs of Pevek, Yanrapaakenay Hill, slope of hill with spotted herb-dryad cover. Photo by O.A. Khruleva.

18

VINOKUROV & KHRULEVA

Figure 4. Environs of Pevek, near Valkumey vill., stream valley with alder and willow bushes. Photo by O.A. Khruleva.

Figure 5. Lower course of Anadyr River, Bushes of dwarf pine and a shrub-sedge-moss tundra in the background. Photo by O.A. Khruleva.

Ecologica Montenegrina, 41, 2021, 15-34 19

BUGS OF TREELESS AREAS OF CHUKOTKA

Figure. 6. Lower course of Anadyr River, floodpalin meadows with alder bushes. Photo by O.A. Khruleva.

Locality 6. Anadyrsky District, 40 km SSW of the Beringovskiy village (62°43.275ʹ N, 178°55.800ʹ E), subzone of southern hypoarctic tundra. Bugs were collected by A.V. Stekolshchikov in July 2012 (about 35 specimens).

The list of localities does not include those from which single specimens of bugs are represented. Since their exact coordinates are not available, the location of these points is indicated on the map approximately (Fig. 1). When listing the studied material, the names of localities are given as they were indicated by collectors on the labels. Abbreviations of collectors are as follows: AD — A.G. Dondua, AS — A.V. Stekolshchikov, DB — D.I. Berman, NV — N.I. Vartanyan, OKh — O.A. Khruleva, SB — S.P. Bukhkalo, YuM — Yu.M. Marusik. District designations in the material list are given in abbreviated form: ChnD — Chaunsky, IuD — Iultinsky, Chk — Chukotsky, AD — Anadyrsky Distrcts. Features of the distribution of species (ranges) are given by: Gorodkov 1984. The studied material is stored in the collection of Heteroptera in the IBPС (Yakutsk) and partially of ZIN (St. Petersburg) and A.N. Severtsov Institute of Ecology and Evolution RAS, Moscow (hereinafter — IPEE).

Results and discussion

Annotated check-list of Heteroptera of Chukotka

Family Corixidae

Callicorixa producta (Reuter, 1880) Literature. Kiritshenko 1960 [as Corisa praeusta (non Fieber, 1848)]; Kanyukova 2006. Distribution and ecology. Holarctic. Predator. Species was recorded from Anadyr, in our materials it is absent.

20

VINOKUROV & KHRULEVA

Family Saldidae

Chiloxanthus arcticus (J. Sahlberg, 1878). Literature. Kiritshenko 1926 [as Ch. pilosus Fall.], 1960; Matis 1986. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 5–22.VII.2011 (ОKh), 17 exs. ChkD: Kolyuchin Bay (Belyaka Spit), 14.VI–21.VII.2015 (NV & AD), 3079 exs. (coll. IPEE). Distribution and ecology.Tundra zone from the Kola Peninsula to Chukotka, the coast of the Sea of Okhotsk and Alaska. Predator. In the vicinity of Pevek, it was collected on a river sandy floodplain. On the Belyaka Spit, it was found only in dry habitats, a particularly high number (more than 800 exs. per 100 trap- days) was recorded on a dry sandy-pebble beach with willow-moss-lichen cover; larvae and adults met together during the entire collection period.

Chiloxanthus stellatus stellatus (Curtis, 1835). Literature. Sahlberg 1887 [as Ch. borealis Stål]; Kiritshenko 1926 [as Ch. borealis Stål]; Matis 1986; Vinokurov et al. 1988; Vinokurov 2005. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 14.VI–22.07.2011 (ОKh), 22 ♂, 27 ♀, 9 lar.; Pekiney Hill (1 km S of Pevek), 7–13.VI.2011 (ОKh), 1 lar. ChkD: Kolyuchin Bay (Belyaka Spit), 14.VI–25.VII.2015 (NV & AD), 2101 exs. (coll. IPEE). AD: 40 km SSW Beringovskiy vill., 14.VII.2012 (AS), 1 ♀. Distribution and ecology. Holarctic. Predator. In the vicinity of Pevek, the species was numerous in the valley of the Apapelgyn River, on the floodplain and in the swamp. On the Belyaka Spit, it was collected in biotopes with different moisture; the highest abundance was recorded in the swamp on the coastal plain; adults and larvae met together during the entire collection period.

Calacanthia trybomi (J. Sahlberg, 1878). Literature. Kiritshenko 1960; Matis 1986; Marusik 1993; Vinokurov et al. 1988; Vinokurov 2005b. Material. ChnD: Yanrapaakenay Hill (1 km N of Pevek), 27.VI–26.VII.2011 (OKh), 8 ♂, 14 ♀; Pekiney Hill (1 km S of Pevek), 29.VI–1.VIII.2011 (ОKh), 2 ♂, 1 ♀, 3 lar. ChkD: Kolyuchin Bay (Belyaka Spit), 27.VI–21.VII.2015 (NV & AD), 22 exs. (coll. IPEE). AD: 40 km SSW Beringovskiy vill., 5–27.VII.2012 (AS), 9 exs. Distribution and ecology. Circumpolar arctic. Predator. In the vicinity of Pevek, it was found sporadically in the mountainous part; bugs were quite numerous only in the spotted grass-shrub-moss tundra on the gravelly dry foothills and slopes of the north-western exposure. On the Belyaka Spit, specimens were collected in a zonal grass-dwarf shrub-moss tundra and in a dry sandy seashore bank 1.5–2 m in height with a forb-grass cover.

Macrosaldula rivularia (J. Sahlberg, 1878). Literature. Matis 1986; Vinokurov 2014. Material. AD: lower course of Anadyr River (22 km above the mouth), 21.VII–5.VIII.2013 (ОKh), 2 ♂, 2 ♀. Distribution and ecology. East Siberian-Nearctic. Predator. Collected in a sandy-pebble floodplain with a rare herb-grass cover.

Saldula fucicola (J. Sahlberg, 1970) Material. AD: 40 km SSW Beringovskiy vill., 10–27.VII.2012 (AS), 1 ♀. Distribution and ecology. Transeurasian. Predator. Along the banks of reservoirs. First record for Chukotka.

Saldula pallipes (Fabricius, 1794). Literature. Matis 1986; Vinokurov et al. 1988. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 5.VII.2011 (ОKh), 1 ♀. Distribution and ecology. Holarctic. Predator. Collected in a sandy floodplain.

Saldula saltatoria (Linnaeus, 1758). Literature. Matis 1986.

Ecologica Montenegrina, 41, 2021, 15-34 21

BUGS OF TREELESS AREAS OF CHUKOTKA

Distribution. Holarctic. Predator. Species was noted from the Chaunsky District (Kremyanka), in our materials it is absent.

Salda littoralis (Linnaeus, 1758). Literature. Kiritshenko 1960. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 22.VII.2011 (ОKh), 1 ♂. Distribution and ecology. Holarctic. Predator. Species was collected in a river floodplain.

Teloleuca bifasciata (Thomson, 1871). Literature. Marusik 1993; Vinokurov 2009. Material. AD: 40 km SSW Beringovskiy vill., 10–27.VII.2012 (AS), 22 exs. Distribution and ecology. Holarctic. Predator. Species was collected in different habitats: in depressions with abundant vegetation, pebble floodplain, as well as loamy-gravelly plots.

Teloleuca pellucens (Fabricius, 1779). Literature. Matis 1986; Vinokurov et al. 1988; Vinokurov 2009. Distribution and ecology. Holarctic. Predator. Species was found in Chaunsky (Apapelgyno, Ayopechan Isl.) and Anadyrsky (Novo-Markovo vill.) Districts. In our materials it is absent.

Family Nabidae

Nabis flavomarginatus Scholtz, 1847. Literature. Matis 1986; Vinokurov et al. 1988. Material. ChnD: lower course of Anadyr River (22 km above the mouth), 9.VIII.2013 (ОKh), 1 ♀. Distribution and ecology. Holarctic. Predator. The species was collected on a forb-grass meadow located on a sandy-pebble floodplain.

Nabis nigrovittatus J. Sahlberg, 1878. Literature. Berman 2001. Material. AD: lower course of Anadyr River (22 km above the mouth), 31.VIII.2013 (ОKh), 1 ♂. Distribution and ecology. Holarctic steppe. Predator. Previously, in Chukotka, the species was recorded without a collection area. The bug was collected in a grass-shrub-lichen-moss tundra with dwarf pine.

Nabis inscriptus Kirby, 1837. Literature. Kerzhner 1981; Matis 1986. Material. AD: lower course of Anadyr River (22 km above the mouth), 24–28.VII.2013 (ОKh), 1 ♀. Distribution and ecology. Holarctic. Predator. First record for the treeless areas of Chukotka. Bug was collected on the southern slope of the creek valley with a herb-shrub-lichen cover.

Family Anthocoridae

Acompocoris brevirostris Kerzhner, 1979. Material. AD: lower course of Anadyr River (22 km above the mouth), 4–8.VIII.2013 (ОKh), 1 ♂. Distribution and ecology. Far Eastern (in the Okhotsk Sea area). Predator, lives on the dwarf pine. First record for Chukotka. Bug was collected on a swamp river terrace with sedge-sphagnum-moss cover and shrubs of dwarf pine and alder.

Anthocoris limbatus Fieber, 1836. Literature. Kiritshenko 1926 [as Anthocoris nemorum L.]; Matis 1986; Vinokurov et al. 1988. Material. AD: Markovo vill., 12–24.VI.1996 (DB), 13 exs.; mouth of the Mine River, 12–13.VI.1996 (DB), 15 exs. Distribution and ecology. European-Siberian. Predator, in the crowns of Salix and Chosenia.

Tetraphleps aterrima (J. Sahlberg, 1878) Literature. Matis 1986; Vinokurov et al. 1988.

22

VINOKUROV & KHRULEVA

Distribution and ecology. European-Siberian. Predator. Species was found in Chaunsky District (Kremyanka), in our materials it is absent.

Family Miridae

Bothynotus pilosus (Boheman, 1852). Literature. Vinokurov et al. 1988. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 5–22.VII.2011 (ОKh), 1 ♂. AD: lower course of Anadyr River (22 km above the mouth), 26.VII–8.VIII.2013 (ОKh), 3 ♂, 4 ♀. Distribution and ecology. Holarctic. Predator, on shrubs. Previously, in Chukotka, the species was recorded without a collection area. In the vicinity of Pevek it was collected in a polydominant herb-shrub tundra, and in the Anadyr River — on a swamp river terrace with sedge-sphagnum-moss cover and shrubs of dwarf pine and alder.

Apolygus lucorum (Meyer-Dür, 1843). Material. ChnD: Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh), 1 ♀. AD: lower course of Anadyr River (22 km upstream the mouth), 8.VIII.2013 (ОKh), 1 ♀. Distribution and ecology. Transeurasian, brought in North America. First record for the treeless areas of Chukotka. In the vicinity of Pevek species was collected in the tussock sedge-shrub-moss tundra, in the Anadyr River — on a swamp river terrace with sedge-sphagnum-moss cover and shrubs of dwarf pine and alder.

Closterotomus fulvomaculatus (De Geer, 1777). Literature. Marusik 1993. Material. AD: lower course of Anadyr River (22 km above the mouth), 29.VII–8.VIII.2013 (ОKh), 2 ♂, 1 ♀. Distribution and ecology. Holarctic. Zoophytophagous, on shrubs. Species was collected in a shrub-moss tundra with dwarf pine and alder in a river valley.

Lygocoris rugicollis (Fallén, 1807). Literature. Kiritshenko 1926; Vinokurov et al. 1988. Material. AD: lower course of Anadyr River (22 km above the mouth), 20–24.VII.2013 (ОKh), 1 ♂, 1 ♀. Distribution and ecology. Holarctic. Phytophagous, on willows. Previously, in Chukotka, the species was recorded from the “Anadyrsky region” without specifying the collection area. It was collected in dry habitats near the water: the sandy-pebble river floodplain with a grassy cover and the rocky valley of the stream with a sporadic grass-shrub-lichen cover.

Lygus rugulipennis Poppius, 1911. Literature. Kiritshenko 1926 [as L. pratensis L]; Puchkov 1965; Matis 1986; Vinokurov et al. 1988; Marusik 1993. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 14.VI–22.VII.2011 (ОKh), 10 exs.; Pekiney Hill (1 km S of Pevek), 20.VII.2011 (ОKh), 1 ex.; Pekiney Hill (7 km S of Pevek), 13.VII.2011 (ОKh), 4 exs.; Valkumey vill. (18 km S of Pevek), 23.VI–29.VII.2011 (ОKh), 7 exs.; middle course of Palyavaam River, 11.VII.2011 (DB), 9 exs. AD: lower course of Anadyr River (22 km above the mouth), 22.VII–9.VIII.2013 (ОKh), 5 exs. Distribution and ecology. Holarctic. Polyphytophagous, on herbs and shrubs. In the vicinity of Pevek it was collected in different habitats. On the Anadyr River it was basically found in a floodplain forb-grass meadow; a single specimen was collected in a shrub-lichen-moss tundra with dwarf pine.

Polymerus unifasciatus (Fabricius, 1794). Literature. Matis 1986; Marusik 1993; Berman 2001. Material. ChnD: middle course of Palyavaam River, 11.VII.2011 (DB), 1 ♀. Distribution and ecology. Holarctic. Phytophagous, on Galium.

Ecologica Montenegrina, 41, 2021, 15-34 23

BUGS OF TREELESS AREAS OF CHUKOTKA

Actinocoris signatus Reuter, 1878. Literature. Marusik 1993. Material. ChnD: Pekiney Hill (7 km S of Pevek), 13.VII.2011 (ОKh), 4 ♂; Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh), 1 ♀. IuD: Bolshaya Osinovaya River, 15.VII.1989 (YuM), 1 ♀ (coll. ZIN). Distribution and ecology. Holarctic. Phytophagous, in wetlands on sedges. In the vicinity of Pevek species was collected in swampy habitats with moss-sedge cover.

Leptopterna ferrugata (Linnaeus, 1758). Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 22.VII.2011 (ОKh), 1 ♀. AD: lower course of Anadyr River (22 km above the mouth), 29.VII.2013 (ОKh), 1 ♀. Distribution and ecology. Holarctic. First record for the north of Far East. Phytophagous, in wetlands on sedges. In the vicinity of Pevek species was collected in a herb-shrub-moss tundra; on the River Anadyr — in the floodplain mesophytic meadow with forb-grass cover.

Leptopterna kerzhneri Vinokurov, 1982. Literature. Marusik 1993. Material. ChnD: Yanrapaakenay Hill (1 km N of Pevek), 18.VII.2011 (ОKh), 2 ♂, 1 ♀. IuD: upper course of Bolshaya Osinovaya River, 10.VII.1989 (YuM), 1 ♀ (coll. ZIN). AD: lower course of Anadyr River (22 km above the mouth), 22.VII–8.VIII.2013 (ОKh), 2 ♂, 6 ♀, 5 lar. Distribution and ecology. Siberian-Far Eastern. Phytophagous, on cereals. In the vicinity of Pevek species was collected on a steep south facing slope of hill with sporadic forb-legume-cereal cover. On the Anadyr River it was mainly found in a floodplain forb-grass meadow; a single specimen was collected in a shrub- lichen-moss tundra with dwarf pine.

Stenodema trispinosa Reuter, 1904. Literature. Matis 1986. Material. AD: lower course of Anadyr River (22 km above the mouth), 9.VIII.2013 (ОKh), 1 lar. Distribution and ecology. Holarctic. Phytophagous, on cereals. First record for treeless area of Chukotka. Species was collected in a floodplain forb-grass meadow.

Teratocoris saundersi Douglas et Scott, 1869. Literature. Marusik 1993. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 22.VII.2011 (ОKh), 3 exs.; Pekiney Hill (7 km S of Pevek), 13.VII.2011 (ОKh), 3 exs.; Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh), 10 exs. AD: lower course of Anadyr River (22 km above the mouth), 22.VII–9.VIII.2013 (ОKh), 15 exs. Distribution and ecology. Holarctic. Phytophagous, in wetlands on sedges. In the vicinity of Pevek species was collected in different wet habitats with herb-shrub-moss cover. On the River Anadyr it was found in a floodplain forb-grass meadow.

Teratocoris viridis Douglas et Scott, 1867. Literature. Matis 1986; Kerzhner 1988; Vinokurov et al. 1988. Material. ChnD: Pekiney Hill (7 km S of Pevek), 13.VII.2011 (ОKh), 4 ♂; Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh), 1 ♂. Distribution and ecology. Holarctic. Phytophagous, in wetlands on sedges. In the vicinity of Pevek species was manly collected in wet habitats with herb-moss cover and willow bushes.

Trigonotylus viridis (Provancher, 1872). Literature. Vinokurov et al. 1988. Material. AD: lower course of Anadyr River (22 km above the mouth), 9.VIII.2013 (ОKh), 1 ♂. Distribution and ecology. Holarctic. Phytophagous, on cereals. Species was collected in a floodplain forb- grass meadow.

Labops burmeisteri (Stål, 1858). Literature. Matis 1986; Vinokurov et al. 1988; Marusik 1993.

24

VINOKUROV & KHRULEVA

Material. IuD: Bolshaya Osinovaya River, 10.VII.1989 (YuM), 2 ♂, 1 ♀ (coll. ZIN). Distribution and ecology. Holarctic. Phytophagous, on cereals.

Orthotylus boreellus (Zetterstedt, 1828). Literature. Vinokurov et al. 1988; Marusik 1993. Material. IuD: Bolshaya Osinovaya River, 10.VII.1989 (YuM), 1 ♂ (coll. ZIN). Distribution and ecology. European-Siberian. Zoophytophagous, on shrubs.

Orthotylus artemisiae (J. Sahlberg, 1878). Literature. Kiritshenko 1960; Matis 1986; Marusik 1993. Material. Chukotka — ChnD: Yanrapaakenay Hill (1 km N of Pevek), 7–18.VII.2011 (ОKh), 16 ♂, 17 ♀; Pekiney Hill (1 km S of Pevek), 20.VII.2011 (ОKh), 10 ♂, 6 ♀; Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh), 2 ♂, 2 ♀. IuD: Egvekinot vill., tidal zone, 29.VII.1988 (YuM), 1 ♂ (coll. ZIN); Vulvoveem River, 8.VIII.1988 (YuM), 1 ♂ (coll. ZIN); 174 km of the Egvekinot–Iultin higway, 17.VII.1989 (YuМ), 4 ♂, 2 ♀ (coll. ZIN). AD: Anadyr town, 31.VII.1991 (SB), 2 ♀ (coll. IBPC). Yakutia (coll. IBPC) — lower course of Yana River, Kular ridge, vicinity of Kular vill., 27–28.VII.2000 (N.K. Potapova), 19 ♀; Yano-Indigirsky interfluve — Selenyakhsky ridge, the vicinity of the Deputatskiy vill., 6.VII–8.VIII.1999 (А.D. Stepanov), 8 ♂, 18 ♀; Kolyma Delta — Cherskiy vill., 29.VI–22.VII.1980 (А.К. Bagachanova), 11 ♂, 19 ♀; Pokhodsk, 45 km N of Cherskiy vill., 18.VII.1973 (N.N. Vinokurov), 1 ♂; Pokhodsk (Peschanaya area), 40 km N of Cherskiy vill., 9.VII.1980 (А.К. Bagachanova), 13 ♂, 2 ♀; Rogovatka area, 60 km N of Cherskiy vill., 14.VII.1980 (А.К. Bagachanova). 2 ♀. Distribution and ecology. Siberian-Nearctic. Phytophagous, on Artemisia. In the vicinity of Pevek, the species was collected mainly in anthropogenically altered habitats dominated by Artemisia tilesii, in Anadyr — on wormwood bushes near the road. Remarks. According to Kiritshenko (1960), in the north of Eurasia, this species lives in the tundra zone from the Obʼ River to Chukotka. Kerzhner (1987) questioned its presence in Chukotka, pointing out that, according to the verified materials of the ZIN collection, it is found from the Polar Urals to the mouth of the Yana River. Meanwhile, according to the IBPC collection, in the north of Yakutia, O. artemisiae is distributed in the lower reaches of the Yana River, the Yano-Indigirka interfluve and in the Kolyma Delta, and its presence in Chukotka is confirmed by the materials presented in this article.

Orthotylus bermani Kerzhner, 1988. Literature. Kerzhner 1988; Vinokurov et al. 1988; Marusik 1993. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 22.VII.2011 (ОKh), 1 ♀; middle course of Palyavaam River, 11.VII.2011 (DB), 1 ♀. ChkD: middle course of Chegityn River (Kasavaleen brook), pebble spit, 23.VII.1991 (SB), 1 ♀ (coll. IBPC). Distribution and ecology. East Siberian-Nearctic. In Northeast Asia, it was collected on Oxytropis spp. (Kerzhner 1988; Khruleva 2007), in the American sector — on Saussurea, Acteraceae (Scudder 1997). In the vicinity of Pevek species was collected at the edge of a road, on Tanacetum boreale.

Orthotylus discolor (J. Sahlberg, 1878). Literature. Kiritshenko 1960; Matis 1986; Kerzhner 1988; Vinokurov et al. 1988. Distribution and ecology. Holarctic Circumpolar. Phytophagous, in wetlands on sedges. Species was found in different areas of Chaunsky District, in our materials it is absent.

Orthotylus lenensis Lindberg, 1928. Literature. Vinokurov et al. 1988; Kerzhner 1988; Berman 2001. Distribution and ecology. Holarctic. Phytophagous, on Allium. Species was found in the Chaunsky District (Ichun River), in our materials it is absent.

Chlamydatus opacus (Zettersteft, 1838). Literature. Matis 1986; Kerzhner 1988; Vinokurov et al. 1988; Marusik 1993. Material. ChkD: Kolyuchin Bay, Belyaka Spit, 14.VI–21.VII.2015 (NV & AD), 476 exs. (coll. IPEE). Distribution and ecology. Holarctic. Trophic connections unknown. In Chukotka, the species was very abundant on sandy dunes of Ayopechan Island (Matis 1986) and in dry habitats with cryoxerophytic

Ecologica Montenegrina, 41, 2021, 15-34 25

BUGS OF TREELESS AREAS OF CHUKOTKA

vegetation on Amguema River (Marusik 1993). On Belyaka Spit, adults and larvae were collected only on a dry sandy seashore bank 1.5–2 m in height with a forb-grass cover (Leymus villosissimus and Lathryrus sp. predominate). In the Indigirka River Basin, specimens were collected in a grass-sedge steppes, in Central Yakutia — under Ephedra (Vinokurov, 1979).

Chlamydatus pullus (Reuter, 1870). Literature. Matis 1986; Vinokurov et al. 1988; Marusik 1993. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 5.VII.2011 (ОKh), 1 ex.; Yanrapaakenay Hill (1 km N of Pevek), 27.VI–29.VII.2011 (ОKh), 96 exs.; Pekiney Hill (1 km S of Pevek), 11.VII–1.VIII.2011 (ОKh), 20 exs.; Pekiney Hill (7 km S of Pevek), 13.VII.2011 (ОKh), 15 exs.; Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh), 1 ex.; middle course of the Palyavaam River, 11.VII.2011 (DB), 1 ♂, 3 ♀. Distribution and ecology. Holarctic. Polyphytophagous. In the vicinity of Pevek, species were collected in different habitats with dry and moderate moisture. They were most numerous on the steep southern slopes with forb-grass and forb-dryad vegetation.

Chlamydatus wilkinsoni (Douglas et Scott, 1866). Literature. Kiritshenko 1960; Kerzhner 1988; Vinokurov et al. 1988; Marusik 1993. Material. ChnD: Pekiney Hill (1 km S of Pevek), 2.VII.2011 (ОKh), 1 ♀; middle course of Palyavaam River, 11.VII.2011 (DB), 1 ♂, 5 ♀. IuD: upper course of the Bolshaya Osinovaya River, 14.VII.1991 (YuМ), 1 ♀ (coll. ZIN); Bolshaya Osinovaya River, Voroniya Hill, edge of the river terrace, 23.VI–VII.1991 (DB), 4 ♀ (coll. ZIN). Distribution and ecology. Holarctic. Trophic connections are not known. In the vicinity of Pevek species was collected on the north-eastern slope with shrub-moss tundra.

Dacota hesperia Uhler, 1872 Literature. Marusik 1993. Distribution and ecology. Holarctic. Phytophagous, on Dasiphora fruticosa (Rosacea) and shrub Betula (Vinokurov et al. 1988). Species was found in the Iultinsky District (Bolshaya Osinovaya River), in our materials it is absent.

Europiella artemisiae (Becker, 1864). Literature. Matis 1986 [as Plagognathus albipennis Fall.]; Marusik 1993 [as Plagognathus albipennis Fall.]; Shuh et al. 1995. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 5–22.VII.2011 (ОKh), 36 exs.; Yanrapaakenay Hill (1 km N of Pevek), 7–18.VII.2011 (ОKh), 15 exs.; Pekiney Hill (1 km S of Pevek), 20– 22.VII.2011 (ОKh), 25 exs.; Pekiney Hill (7 km S of Pevek), 13.VII.2011 (ОKh), 37 exs.; Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh), 22 exs. AD: lower course of Anadyr River (22 km above the mouth), 8.VIII.2013 (ОKh), 2 exs. Distribution and ecology. Holarctic. Phytophagous, on wormwood (Artemisia). In the vicinity of Pevek, this is a numerous species collected in dry biotopes with a high participation of Artemisia tilesii — in zoogenic meadows, anthropogenic disturbed areas, along roads. On the Anadyr River it was collected in a floodplain mesophytic herb-grass meadow and in a damp shrub tundra on a river terrace.

Plagiognathus obscuriceps (Stål, 1858). Material. AD: lower course of Anadyr River (22 km above the mouth), 8.VIII.2013 (ОKh), 1 ♂. Distribution and ecology. Holarctic. Phytophagous, on different shrubs. First record for Chukotka. Species was collected on a river terrace, in damp shrubby tundra with dwarf pine and alder.

Plagiognathus pini Vinokurov, 1978. Material. AD: lower course of Anadyr River (22 km above the mouth), 8.VIII.2013 (ОKh), 1 ♀. Distribution and ecology. East Siberian-Far Eastern. Phytophagous, on dwarf pine (Pinus pimula), the species distribution correlated with area of host plant. First record for Chukotka. It was collected on a river terrace, in damp shrubby tundra with dwarf pine and alder.

26

VINOKUROV & KHRULEVA

Psallus betuleti (Fallén, 1826). Literature. Matis 1986; Vinokurov et al. 1988; Marusik 1993. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 22.VIII.2011 (ОKh) 1 ♀; Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh) 1 ♂, 2 ♀. AD: lower course of Anadyr River (22 km above the mouth), 24–31.VII.2013 (ОKh), 2 exs. Distribution and ecology. Holarctic. Phytophagous, on Betula. In the vicinity of Pevek it was collected in moss-shrubby (willows, dwarf birch) tundra and in bushes of willow, dwarf birch and alder.

Psallus aethiops (Zetterstedt, 1838). Literature. Matis 1986; Vinokurov et al. 1988; Marusik 1993. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 5.VII.2011 (ОKh), 8 exs.; Pekiney Hill (7 km S of Pevek), 13.VII.2011 (ОKh), 10 exs. Distribution and ecology. Holarctic. Phytophagous, on Salix. In the vicinity of Pevek, it was collected in habitats with different hydrothermal characteristics, but always with a noticeable participation of willows in the vegetation cover.

Psallus anticus (Reuter, 1876). Material. ChnD: Yanrapaakenay Hill (1 km N of Pevek), 10–17.VI.2011 (ОKh), 3 ♀; Valkumey vill. (18 km S of Pevek), 23.VII.2011 (ОKh), 2 ♂. AD: lower course of Anadyr River (22 km above the mouth), 29.VII–5.VIII.2013 (ОKh), 3 ♂, 1 ♀. Distribution and ecology. Euroasian steppe. Phytophagous, on Spiraea. First record for Chukotka. In the vicinity of Pevek, it was collected in dry habitats with herb-shrubby cover. On Anadyr River it was collected in a floodplain mesophytic meadow and in moss-shrubby tundra with dwarf pine and alder.

Family Tingidae

Acalypta elegans Horváth, 1906. Literature. Vinokurov et al. 1988. Material. ChnD: Yanrapaakenay Hill (1 km N of Pevek), 10–17.VI.2011 (ОKh), 3 exs. AD: lower course of Anadyr River (22 km above the mouth), 20–31.VIII.2013 (ОKh), 2 exs. Distribution and ecology. Holarctic. On mosses. Previously, in Chukotka, the species was recorded without a collection area. The species was collected in pitfall traps: in the vicinity of Pevek on a dry hillock with sporadic wormwood-grass cover, in the Anadyr River — on a dry gravel-stony edge of a stream with sparse grass-shrub-lichen cover and a steep slope of a river valley with grass-shrub cover.

Acalypta nigrina (Fallén, 1807). Literature. Marusik 1993. Material. ChnD: Yanrapaakenay Hill (1 km N of Pevek), 17–26.VI.2011 (ОKh), 1 ex.; Pekiney Hill (1 km S of Pevek), 13–19.VI.2011 (ОKh), 1 ex. IuD: upper course of Bolshaya Osinovaya River, forest with Chosenia, in moss, 13.VII.1989 (YuM), 4 exs. (coll. ZIN). AD: lower course of Anadyr River (22 km above the mouth), 20–24.VII.2013 (ОKh), 3 exs. Distribution and ecology. Transpalearctic. On mosses. Species was collected in pitfall traps: in the vicinity of Pevek on a zoogenic meadows with forb-wormwood-cereals cover, in the Anadyr River — at a dry gravel-stony plots with sparse cereals-shrub-lichen and moss-lichen cover.

Family Aradidae Aradus angularis J. Sahlberg, 1878. Literature. Matis 1986; Vinokurov et al. 1988; Marusik 1993. Material. IuD: Bolshaya Osinovaya River, 15.VII.1989 (YuМ), 1 ex. AD: Anadyr River, basin of Mine River, 13.VI.1996 (DB), 1 ♂. Distribution and ecology. European-Siberian. Under the bark, on woody mushrooms. Bug was collected in the Chosenia grove, under the bark.

Aradus frigidus Kiritshenko, 1913. Literature. Marusik 1993; Kanyukova & Vinokurov 2007.

Ecologica Montenegrina, 41, 2021, 15-34 27

BUGS OF TREELESS AREAS OF CHUKOTKA

Material. IuD: Bolshaya Osinovaya River, floodplain, under the pebbles, 25.VII.1991 (YuМ), 1 lar. (coll. ZIN). Distribution and ecology. European-Siberian. Under the bark, on woody mushrooms.

Aradus lugubris Fallén, 1807. Literature. Kiritshenko 1960; Matis 1986; Vinokurov et al. 1988. Material. ChD: Yanrapaakenay Hill, 1 km N of Pevek, 10.VI.2011 (ОKh), 1 ♂. Distribution and ecology. Holarctic. Under the bark, on woody mushrooms. Species was collected on a dry gravel-loamy foothill, in spotted cereals-shrubby-moss tundra.

Family Lygaeidae

Nysius ericae groenlandicus (Zetterstedt, 1838). Literature. Kiritshenko 1960; Matis 1986; Vinokurov et al. 1988; Marusik 1993. Material. Mainland Chukotka — ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 14.VI– 22.VII.2011 (ОKh), 93 exs.; Yanrapaakenay Hill (1 km N of Pevek), 22.VI–26.VII.2011 (ОKh) 78 exs.; Pekiney Hill (1 km S of Pevek), 11–20.07.2011 (ОKh), 21 exs.; Pekiney Hill (7 km S of Pevek), 13.VII.2011 (ОKh), 6 exs.; Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh) 57 exs.; middle course of Palyavaam River, 11–25.VII.2011 (DB), 4 ♂, 12 lar. IuD: Bolshaya Osinovaya River, Voroniya Hill, VII.1991 (DB), 1 ex. AD: lower course of Anadyr River (22 km above the mouth), 22.VII–9.VIII.2013 (ОKh), 14 exs. Wrangel Island — middle course of Mamontovaya River, mouth of Vesely brook (71°10.5ˊ N, 179°45ˊ W), 21.VII–13.VIII.2006 (ОKh), 106 lar.; middle course of Vesely brook (71°11.5´ N, 179°43´ W), 18.VII.2019 (ОKh), 1 ♂; upper course of Neizvestnaya River (71°13ˊ N, 179°20ˊ W), 3–6.VII.2006 (ОKh), 1 lar.; Mineev Mnts (71°0.5´ N, 179°31ˊ W), 14.VII–14.VIII.2006 (ОKh), 1 lar. Distribution and ecology. Holarctic. Polyphytophagous. In the vicinity of Pevek, it inhabits a wide range of habitats, reaching a high abundance in dry biotopes with a predominance of wormwood (Artemisia kruhsiana or Artemisia tilesii); larvae were recorded from mid-June, adults — from July 4. In Anadyr River valley it was found mainly in a dry foodplain meadows, two larvae were collected in tussock sedge-moss tundra with dwarf pine. From Wrangel Island N. e. groenlandicus was previously listed without label data (Khruleva 2009, 2014). Few specimens were collected on a dry south facing slopes of hills and river terraces with cryoxerophytic vegetation. A high abundance of this species on Wrangel Island (a total of 102 specimens) was recorded only once: in sweep-nets carried out on August 6 and 13, 2006 in a zoogenic herb-wormwood meadow (fox burrow) at the mouth of Vesely brook, but in subsequent studies of this biotope in 2015 and 2019 the species was not found.

Kleidocerys resedae (Panzer, 1797). Material. AD: lower course of Anadyr River (22 km above the mouth), 22.VII–9.VIII.2013 (ОKh), 2 ♀. Distribution and ecology. Transpalearctic. Polyphytophagous. First record for Chukotka. On Anadyr River bugs were collected on a floodplain mesophytic and dry meadows.

Trapezonotus desertus Seidenstücker, 1951. Literature. Matis 1986; Vinokurov 1990; Marusik 1993. Material. ChnD: Pekiney Hill (7 km S of Pevek), 21.VI.2011 (ОKh), 1 ♀; middle course of Palyavaam River, 11–25.VII.2011 (DB), 2 ♂, 1 ♀, 1 lar. AD: lower course of Anadyr River (22 km above the mouth), 7.VIII.2013 (ОKh), 1 ♀. Distribution and ecology. Holarctic. Polyphytophagous, in litter. In a vicinity of Pevek species was collected on a dry south facing gravelly slope of hill with spotted forb-dryad cover; in the Anadyr River — in a stream valley with alder bushes.

Family Coreidae

Coriomerus scabricornis (Panser, 1805). Literature. Matis 1986. Material. ChD: Yanrapaakenay Hill (1 km N of Pevek), 3.VI–29.VII.2011 (ОKh), 3 ♂, 1 ♀; Pekiney Hill (7 km S of Pevek), 14–27.VI.2011 (ОKh), 3 ♀; middle course of Palyavaam River, 11.VII.2011 (DB), 2 ♂, 3

28

VINOKUROV & KHRULEVA

♀. Distribution and ecology. Transeurasian. Phytophagous, on Fabaceae. First record for treeless areas of Chukotka. In the vicinity of Pevek species were collected in different dry habitats, mainly in the southfacing foothills and slopes.

Family Rhopalidae

Stictopleurus crassicornis (Linnaeus, 1758). Literature. Matis 1986. Material. ChnD: Valkumey vill. (18 km S of Pevek), 23.VI.2011 (ОKh), 2 exs. Distribution and ecology. Transeurasian. Polyphytophagous, on shrubs. First record for treeless areas of Chukotka. Species were collected in a stream valley with willow and willow-alder bushes.

Stictopleurus sericeus (Horváth, 1896). Literature. Marusik 1993; Berman 2001; Kanyukova & Vinokurov 2009. Material. ChnD: lower course of Apapelgyn River (20 km NE of Pevek), 14.VI–22.VII.2011 (ОKh), 19 exs. Distribution and ecology. Euroasian steppe. Phytophagous, on Asteraceae. The adults and larvae were collected on a dry hillock in the river valley with predominated of Artemisia kruhsiana.

Family Scutelleridae

Phimodera laevilinea Stål, 1873 Literature. Berman 2001; Berman et al. 2002. Material. IuD: Bolshaya Osinovaya River, Voronya Hill, 25.VII.1991 (DB), 1 lar. AD: middle course of Anadyr River, Utesiki, 5 km above mouth, 23.VI.1996 (DB), 1 ♂. Distribution and ecology. Dauro-Mongolian steppe species, north to Chukotka through the extrazonal steppes. Phytophagous, on cereals. In northeast Asia, it is distributed in the mountainous steppes of Yana, Indigirka and upper Kolyma rivers basins. In the tundra zone of Yakutia, it was found in the Kolyma Delta (Krutaya Dresva area). For Chukotka, the species was previously recorded without label data (Berman et al. 2002) from the localities given in the "Material".

Family Pentatomidae

Aelia frigida Kiritshenko, 1926. Material. ChnD: middle course of Palyavaam River, 11–25.VII.2011 (DB), 6 ♂, 2 ♀, 1 lar. Distribution and ecology. Phytophagous, on cereals. The species with a disjunctive range in South (Altai) and North-East Siberia, inhabits the mountain steppes on the Verkhoyansky and Chersky ridges (Vinokurov 1979; Berman 2001; Khruleva & Vinokurov 2007). In the tundra zone of Yakutia, it was recorded on the Kular ridge (Vinokurov et al. 1998). First record for Chukotka.

Antheminia eurynota remota (Horváth, 1907). Literature. Berman 2001; Berman et al. 2002. Material. ChnD: Yanrapaakenay Hill (1 km N of Pevek), on the flower of Pulsatilla, 10–26.VI.2011 (ОKh), 14 exs.; Pekiney Hill (1 km S of Pevek), 13–29.VI.2011 (ОKh), 4 exs.; Pekiney Hill (7 km S of Pevek), 21.VI.2011 (ОKh), 1 ex.; Valkumey vill. (18 km S of Pevek), 23.VII.2011 (ОKh), 1 ex.; middle course of Palyavaam River, dry tundra, 11–25.VI.2011 (DB), 24 exs. AD: lower course of Anadyr River (22 km above the mouth), 7.VIII.2013 (ОKh), 2 lar. Distribution and ecology. Mountains of North-Eastern Siberia, Central Asia, Mongolia and North America. Phytophagous, on Fabaceae. In the vicinity of Pevek, it is quite numerous on a dry slopes of southern exposure with herb-sedge-dryad cover; adults were collected in pitfall traps throughout June; larvae — in mid-July. In the Anadyr River it was collected on a dry floodplain meadow.

Sciocoris microphthalmus Flor, 1860. Literature. Matis 1986; Berman 2001; Berman et al. 2002. Material. ChnD: Valkumey vill. (18 km S of Pevek), 29.VII.2011 (ОKh), 1 ♀.

Ecologica Montenegrina, 41, 2021, 15-34 29

BUGS OF TREELESS AREAS OF CHUKOTKA

Distribution and ecology. Holarctic. Phytophagous, on cereals. Species was collected near road, on wormwood.

Rhacognathus punctatus (Linnaeus, 1758). Material. ChnD: Valkumey vill. (18 km S of Pevek), 23.VI.2011 (ОKh), 1 ♀. Distribution and ecology. Transeurasian. Predator, on shrubs. First record for Chukotka. Species was collected in herb-shrub-moss tundra with Salix tschuktchorum.

Fauna composition

The list of Heteroptera contains 62 species belonging to 41 genera and 12 families. Six of them are known only from literary sources; data on the distribution of other species in the treeless areas of Chukotka are significantly supplemented. Of these, 11 species were first recorded for the Chukotka Autonomous Okrug. These are Saldula fucicola (Saldidae), Acompocoris brevirostris (Anthocoridae); Apolygus lucorum, Leptopterna ferrugata, Teratocoris saundersi, Plagiognathus obscuriceps, Plagiognathus pini, Psallus anticus (Miridae); Kleidocerys resedae (Lygaeidae); Aelia frigida, Rhacognathus punctatus (Pentatomidae). The studied fauna is dominated by two families — Miridae with 29 species (47 %) and Saldidae with 10 species (16 %); the remaining families are from one to four species. The biogeographic composition of the fauna has a number of features. The fauna is dominated by species with a wide Holarctic (38 species, 61 %) and Eurasian (15 species, 24 %) distribution. Only a few species are restricted to narrower ranges: Siberian-Nearctic (4 species) or East Asian (5 species). The specificity of the latitudinal structure of the fauna is the predominance of species with a limited distribution in the tundra zone, mainly with multizonal or wide boreo-montane ranges. Most of them are found in the treeless areas of Chukotka sporadically and with a small abundance. True Arctic species (as understood by Chernov & Matveeva (2002), or "tundra species" according to Kiritshenko (1960)) are mainly represented by two families: Saldidae (Chiloxanthus arcticus, Ch. stellatus, Calacanthia trybomi) and Miridae (Orthotylus artemisiae, O. bermani, Chlamydatus opacus, Ch wilkinsoni). They have a meta-arctic or arctic-montain distribution, but are numerous and regularly found only within the tundra zone. All of them are known from different areas of the Chukchi tundra including the most severe coastal northern localities or Wrangel Island (Kiritshenko 1960; Matis 1986; Kerzhner 1988; Marusik 1993; Khruleva 2007, 2009), but were not found either in the elfin wood subzone or in the northern taiga (Table). Thus, their distribution over the zonal gradient of Chukotka confirms a decrease in their activity outside the tundra zone. The arctic-montain Nysius ericae groenlandicus (Lygaeidae) has a similar distribution pattern, it is especially active in the western, most continental part of the Chukchi tundra. This group species consist about 13 % of all fauna. In addition to the Arctic species, the fauna contains species (mainly with hypoarctic-boreal-montain range), which are numerous in the Hypoarctic landscapes: northern taiga and forest-tundra, less often southern tundra (9 species, about 15 % of fauna). There are Leptopterna ferrugata, Teratocoris saundersi, T. viridis, Dacota hesperia, Psallus betuleti, Ps. aethiops (Miridae) and Acalypta elegans (Tingidae). This group, apparently, also includes Teloleuca bifasciata (Saldidae) and Orthotylus discolor (Miridae) that Kiritshenko (1960) called "tundra species". All of them are found much more locally in the Chukchi tundra than the Arctic species. The peculiarity of the fauna determines the presence of a relict extrazonal steppe complex. These species live in the mountain steppes of the Yana, Indigirka, and upper Kolyma rivers basins. They make up 11 % of the fauna, among them species with a disjunctive distribution predominate. These are Aelia frigida, Phimodera laevilinea, Orthotylus lenensis and Antheminia eurynota remota. Other species are widely distributed in the Eurasian steppes — Nabis nigrovittatus, Psallus anticus, Stictopleurus sericeus. In Chukotka, most of them are limited to the driest and warmest stations. It is significant that even in the northern part of Chukotka (vicinity of Pevek) three species of this group are collected, of which A. eu. remota is even quite numerous.

30

VINOKUROV & KHRULEVA

Table. Species composition and distribution of Heteroptera living in treeless landscapes of Chukotka.

Elfin wood Northern Bug species Tundra zone subzone taiga subzone Callicorixa producta А2 – – Chiloxanthus arcticus Chn2,4,8, Chk – – Chiloxanthus stellatus stellatus Wr12,13, Chn2,4,8, Iu4,8, Chk2, P2, А8 – – Calacanthia trybomi Wr12,13, Chn2,4, Iu6,9, Chk9, А – – Macrosaldula rivularia Chn4, Iu11, А11 А – Saldula fucicola А – – Saldula pallipes Chn4 – – Saldula saltatoria Chn4, Iu6 – – Salda littoralis Chn, А4 – B4 Teloleuca bifasciata Iu6*, A – – Teloleuca pellucens Chn4 A10 – Nabis flavomarginatus – А4 – Nabis nigrovittatus – А – Nabis inscriptus – А B4 Acompocoris brevirostris – А – Anthocoris limbatus – А4 – Tetraphleps aterrimus Chn4 – B4 Bothynotus pilosus Chn А – Apolygus lucorum Chn А – Closterotomus fulvomaculatus Iu*6 А – Lygocoris rugicollis – А1 – Lygus rugulipennis Chn, Iu6* А B4 Polymerus unifasciatus Chn, Iu6* – B4 Actinocoris signatus Chn, Iu6* – – Leptopterna ferrugata Chn А – Leptopterna kerzhneri Chn, Iu6* А – Stenodema trispinosa – А B4 Teratocoris saundersi Chn, Iu6* А – Teratocoris viridis Chn4,5 B4 Trigonotylus viridis – А – Labops burmeisteri Chn4, Iu6* – – Orthotylus boreellus Iu6* – B4 Orthotylus artemisiae Chn2,4, Iu4,6, А – – Orthotylus bermani Wr12,13, Chn, Iu5, Chk – – Orthotylus discolor Chn2,4,5 – B4 Orthotylus lenensis Chn5 – – Chlamydatus opacus Chn4, Iu5,6, Chk – – Chlamydatus pullus Chn4, Iu5,6 – B4 Chlamydatus wilkinsoni Wr12,13, Chn2,4, Iu5,6 – – Dacota hesperia Iu6* – – Europiella artemisiae Chn4, Iu6* А B4 Plagiognathus obscuriceps – А – Plagiognathus pini – А – Psallus betuleti Chn4, Iu6* А B4 Psallus aethiops Chn4, Iu6 – B4 Psallus anticus Chn А – Acalypta elegans Chn А – Acalypta nigrina Chn, Iu6* А – Aradus angularis Iu6* А4 – ..continued on the next page

Ecologica Montenegrina, 41, 2021, 15-34 31

BUGS OF TREELESS AREAS OF CHUKOTKA

Table 1. Aradus frigidus Iu6* – – Aradus lugubris Chn А2 B4 Nysius ericae groenlandicus Wr13, Chn2,4, Iu6 А – Kleidocerys resedae – А – Trapezonotus desertus Chn, Iu6* А7 B4 Coriomerus scabricornis Chn – B4 Stictopleurus crassicornis Chn – B4 Stictopleurus sericeus Chn, Iu6* – – Phimodera laevilinea Iu7 А7 – Aelia frigida Chn – – Antheminia eurynota remota Chn, Iu7 А7 – Sciocoris microphthalmus Chn А7 B4 Rhacognathus punctatus Chn – –

Abbreviatins of Districts: Wr — Wrangel Island (included in Iultinsky District); Chn — Chaunsky, Iu — Iultinsky, Chk — Chukotsky, P — Providensky; A — Anadyrsky; B — Bilibinsky. * Species known from the Iultinsky District only from the Bolshaya Osinovaya River. Species first recorded in the District are highlighted. Literary sources: 1 Kiritshenko 1926; 2 Kiritshenko 1960; 3 Kerzhner 1981; 4 Matis 1986; 5 Kerzhner 1988; 6 Marusik 1993; 7 Berman et al. 2002; 8 Vinokurov 2005a; 9 Vinokurov 2005b; 10 Vinokurov 2009; 11 Vinokurov 2014;12 Khruleva 2007; 13 Khruleva 2009.

Some features of Heteroptera distribution in the studied areas of Chukotka

As a result of the research, the number of species known from the treeless landscapes of Chukotka has increased significantly. This is especially true for the elfin wood subzone, whose fauna was least studied. The number of species known from this subzone has been increased from 10 to 32 (Table), and the species richness of the local fauna (the lower course of the Anadyr River) was 26 species. The fauna of bugs of the Chukchi tundra previously included 39 species. Most of them were found in the Western region of Chukotka with a continental climate; 23 species were collected only here and 14 of them at one locality — on the Bolshaya Osinovaya (or Left Telekai) River (Table), in the place of growth of the floodplain forest Chosenia arbutifolia, known as Telekai Grove. The intermountain valley, where it is located, has a unique microclimate and, apparently, serves as a refuge for most bug species that live here. However, in 2011, many species previously found only in this area (8 out of 14) were collected in the north of the Chaunsky Bay, as well as 11 more still unknown from the Chukchi tundra. Prior to this, the largest number of species in this region (19) was known from the vicinity of Ustʼ-Chaun, a subzone of the southern hypoarctic tundra (Matis 1986; Kerzhner 1988). In 2011, 32 species were collected in the vicinity of Pevek, located in the more northern subzone. Matis (1986) had previously collected only six species here. Such differences in species richness may be associated not only by a more detailed survey of the territory, but also by the marked warming of the Arctic climate in the last two decades. This could have caused an increase in the abundance of previously rare species, which allowed them to be collected in the area. In any case, the new data indicate that the species richness of Heteroptera in the Chukchi tundra is higher than previously assumed. Their total number increased from 39 to 51, and for open tundra landscapes — from 25 to 46. This growth was mainly due to the addition of various "southern" species, collected, as before, mainly in the Western region of Chukchi tundra. Thus, in contrast to the fairly uniform distribution of Arctic species, most of the rest is quite strictly limited here to areas with a continental climate.

Сonclusion

The new material on bugs, collected mainly in the period 2011–2015, made it possible to significantly supplement the data on the Heteroptera of Chukotka. The list of species has been expanded, as well as information about their distribution in treeless areas of this region. For the first time, one of the local fauna of the elfin wood subzone has been studied in detail, and information about the tundra fauna of bugs has been

32

VINOKUROV & KHRULEVA

significantly updated. Some features of the distribution of species within the Chukotka are revealed. Species with a predominantly Arctic distribution are mostly restricted to the tundra zone, which confirms the narrowness of their ecological optimum. In addition, the new data indicate a much higher saturation of the tundra fauna of Chukotka with widespread miltizonal and boreal species than previously thought. But if most Arctic species in their distribution within the Chukchi tundra do not show a connection with climate change along the continental-oceanic gradient, then almost all "southern" ones are limited to its western part with the most continental climate.

Acknowledgments

We are grateful to entomologists D.I. Berman, Yu.M. Marusik, S.P. Bukhkalo (IBPN FEB RAS, Magadan), A.V. Stekolshchikov (ZIN RAS, St. Petersburg), as well as N.I. Vartaynan and A.G. Dondya (St. Petersburg), whose materials on bugs included in this publication. The research of N.N. Vinokurov was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme No. 0297-2021-0044, reg. No. 121020500194-9). The work of O.A. Khruleva was supported by the RFBR grant No. 20-04-00165.

References

Berman, D.I. (2001) Heteroptera. Cold Steppes of the Northeast Asia. Magadan: IBPS DVNC RAN, 124– 133 [In Russian]. Berman, D.I., Alfimov, A.V. & Korotyaev, B.A. (2002). Xerophilic arthropods in the tundra-steppe of the Utyosiki Locality (Chukchi Peninsula). Zoologicheskii Zhurnal, 81 (4), 444–450. [In Russian; English translation: Entomological Review, 82 (1), 94–100]. Breddin, G. (1902) Die Hemipteren und Siphunculaten der arktichen Gebites. Fauna Arctica, II, 529–560. Chernov, Yu.I. (1978) The structure of the animal population of the Subarctic. Moscow: Nauka. 165 p. [In Russian]. Chernov, Yu.I. & Matveyeva, N.V. (2002) Landscape-zonal distribution of the Arctic biota species. Uspekhi sovremennoy biologii, 122 (1), 26–45 [In Russian]. Danks, H.V. (1981) Arctic Arthropods. A Review of Systematics and Ecology with Particular Reference to the North American Fauna. Entomological Society of Canada, Ottawa. 608 p. Gorodkov, K.B. (1984) Ranges types of insects of tundra and forest zones of European Part of U.S.S.R. Areas of insects of European Part of U.S.S.R. Atlas. Maps 179–221. Leningrad: Nauka, 3–20 [In Russian]. Kanyukova, E.V. (2006) Aquatic and semiaquatic bugs (Heteroptera: Nepomorpha, Gerromorpha) of the fauna of Russia and neighboring countries. Vladivostok: Dalʼnauka, 297 p. [In Russian]. Kanyukova, E.V. & Vinokurov, N.N. (2007) New data on distribution of bark bugs in Siberia and the Far East of Russia (Heteroptera: Aradidae). Zoosystematica Rossica, 16 (1), 48. Kanyukova, E.V. & Vinokurov, N.N. (2009). New data to the fauna of superfamilies Lygaeoidea, Pyrrhocoroidea and Coreoidea (Heteroptera) of the Asian part of Russia. Problems of animals study and protection in the North. Proceedings of the All-Russian Scientific Conference with International Participation (Syktyvkar, 16–20 November 2009). Syktyvkar, 57–59. Kerzhner, I.M. (1981) Heteropterans of the family Nabidae. Fauna SSSR. Nasekomye khobotnye [Fauna of the USSR. Rhynchota], 13, 2. Leningrad: Nauka, 327 p. [In Russian]. Kerzhner, I.M. 1988 (1987) New and little-known heteropteran species from the Far East of the USSR. Vladivostok: Far Eastern Scientific Center of the USSR Academy of Sciences. 83 p. [In Russian]. Khruleva, O.A. (2007). Peculiarity of terrestrial Arthropod fauna in view of Environment of the Wrangel Island. Nature of Wrangel Island. Recent Studies. St. Petersburg: Asterion, 136–175 [In Russian]. Khruleva, O.A. (2009). Arthropod assemblages of the Wrangel Island in an context of recent and Pleistocene tundra-steppe insect faunas of the northeastern Asia. Species and Comminities in Extreme Envirinments. Moscow–Sofia: KMK Scientific Press and PENSOFT, 124–167 [In Russian]. Khruleva, O.A. (2014). The modifying of terrestrial arthropod complex of the Wrangel Island in the climate warming conditions. Complex investigation of the Svalbard and offshore nature. Proceeding of the

Ecologica Montenegrina, 41, 2021, 15-34 33

BUGS OF TREELESS AREAS OF CHUKOTKA

International Scientific Conference (Murmansk, 6–8 November 2014). Issue 12. Moscow: GEOS, 316–322 [In Russian]. Khruleva, O.A. & Vinokurov, N.N. (2007). Terrestrial bugs (Heteroptera) in High Mountains of the Suntar- Khayata Range (Eastern Yakutia). Zoological Journal, 86 (9), 1057–1072 [In Russian; English translation: Entomological Review, 87 (9), 1126–1141]. Kiritshenko, A.N. (1926) Hemiptera–Heteroptera of Kamchatka. Annals of the Zoological Museum, Academy of Sciences of the USSR, 27 (1), 9–28 [In Russian]. Kiritshenko, A.N. (1960) Heteroptera of the eastern sector of Arctic Eurasia. Entomological Review, 39 (3), 617–628 [In Russian]. Marusik, Yu.M. (1993) Terrestrial invertebrates. Ekology of the Amguema river basin. 1. Vladivostok, 164– 185 [In Russian]. Matis, E.G. (1986) Insects of Asian Beringia (ecological-geosystem study, principles and experience). Moscow: Nauka, 310 p. [In Russian]. Puchkov, V.G. (1966) The main horseflies, pests of agricultural crops. Kiev: Naykova Dumka, 172 p. [In Russian]. Sahlberg, J. (1887) Bidrag till Tschuktsch-halföns Insectfauna. Coleoptera jcy Hemiptera, insamlade under Vtga-expeditionen vid halföns norra och östra, kust, 1878–1879. Vega-Expeditionens Vetenskapliga Iskttagelser bearbetade af deltagare i resan och andra forskare, utgifna af A. E. Nordenskiöld. Stokholm F. & G. Beijers Förlag, 1–41. Scudder, G.G.E. (1997) True Bugs (Heteroptera) of the Yukon. Insects of the Yukon. Ottawa: Biological Survey of Canada, 241–336. Shuh, R.T., Lindskog, P. & Kerzhner, I.M. (1995) Europiella Reuter (Heteroptera: Miridae): recognition as a holarctic group, notes on synonymy, and description of a new species, Europiella carvalhoi, from North America. Proceedings of the Entomological Society of Washington, 97 (2), 397–395. Vinokurov, N.N. (1979) True bugs (Heteroptera) of Yakutia. Opredeliteli po faune SSSR [Keys to the fauna of the USSR], 123. Leningrad: Nauka. 232 p. [In Russian; English translation: Heteroptera of Yakutia. 1988. New Delhi: Amerind Publishing, 328 p.]. Vinokurov, N.N. (1990) True bugs of the genus Trapezonotus (Heteroptera, Lygaeidae) in the fauna of the USSR and Mongolia. Insects of Mongolia. Leningrad: Nauka, 10, 70–90 [In Russian]. Vinokurov, N.N. (1998) Materials on the Study of Patterns of Landscape-Zonal Distribution of Insects in Eastern and North-Eastern Siberia. Siberian Ecological Journal, 1, 65–68 [In Russian]. Vinokurov, N.N. (2005a) A review of the Chiloxanthus Reut. (Heteroptera, Saldidae) in the fauna of Russia and adjacent countries. Entomological Review, 84 (1), 46–61 [In Russian; English translation: Entomological Review, 2005, 85 (2), 118–130]. Vinokurov, N.N. (2005b) New data on distribution of shore bugs (Heteroptera, Saldidae) in Siberia. Zoological Journal, 84 (7), 885–888 [In Russian; English translation: Entomological Review, 2005, 85 (7), 819–822]. Vinokurov, N.N. (2009) A review of the shore bugs genus Teloleuca Reut. (Heteroptera, Saldidae) in the fauna of Russia and adjacent countries. Zoological Journal, 89 (10), 1189–2000 [In Russian; English translation: Entomological Review, 2009, 89 (9), 1092–1103]. Vinokurov, N.N. (2014) Review of the genus Macrosaldula Southwood et Leston, 1959 (Heteroptera, Saldidae) of the fauna of Russia and adjacent countries. Entomological Review, 93 (1), 151–173 [In Russian; English translation: Entomological Review, 94 (7), 982–999]. Vinokurov, N.N., Golub, V.B., Kanyukova, E.V., Kerzhner, I.M. & Tshernova, G.P. (1988) Order Heteroptera (Hemiptera) — bugs. Keys to the insects of the Far East of the USSR in six volumes. Vol. II. Homoptera and Heteroptera. Leningrad: Nauka Publishing House, 727‒930 [In Russian]. Vinokurov, N.N., Novikov, D.A. & Stepanov, A.D. (1998) Records of little-known Homoptera and Heteroptera from Yakutia. Zoosystematica Rossica, 7 (1), 173–174. Yurtsev, B.A., Koroleva, T.M., Petrovsky, V.V., Polozova, T.G., Zhukova, P.G. & Katenin, A.E. (2010) Checklist of Flora of the Chukotkan Tundra. St. Petersburg: VVM, 628 p. [In Russian].

34