Hymenoptera, Tenthredinoidea) from Sweden, with Taxonomic Notes on Palaearctic Heptamelus Species Described by Swedish Authors
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Ent. Tidskr. 139 (2018) New and poorly-known sawflies from Sweden New and poorly-known sawflies (Hymenoptera, Tenthredinoidea) from Sweden, with taxonomic notes on Palaearctic Heptamelus species described by Swedish authors ANDREW D. LISTON, HEGE VÅRDAL & MARKO PROUS Liston, A.D., Vårdal, H. & Prous, M.: New and poorly-known sawflies (Hymenoptera, Tenthredinoidea) from Sweden, with taxonomic notes on Palaearctic Heptamelus spe- cies described by Swedish authors. [Nya och dåligt kända växtsteklar från Sverige, med kommentarer om taxonomin hos de palearktiska arter i släktet Heptamelus som beskrivits av svenska entomologer.] – Entomologisk Tidskrift 139 (2): 119-131. Uppsala, Sweden 2018. First records from Sweden of eight sawfly taxa are presented:Arge annulata Konow, 1891 (Argidae), Allantus cingillipes (Kontuniemi, 1947), Allantus melanarius (Klug, 1818), Apethymus cereus (Klug, 1818), Dolerus liogaster schneideri Kiaer, 1898, Fenusella hor- tulana (Klug, 1818), Monophadnus spinolae (Klug, 1816), and Tenthredo mandibularis Fabricius, 1804 (Tenthredinidae). The problematic taxonomic status of Arge annulata is discussed, and it is recorded for the first time from Germany and Estonia. For Heptam- elus dahlbomi (Thomson, 1870) (Heptamelidae): a lectotype is designated for Caenoneura dahlbomi, H. ussuriensis Malaise, 1931 is placed as its junior synonym, Athyrium distenti- folium recorded as a new host, and additional distribution data are presented, including the first records from Austria. A lectotype is designated forHeptamelus magnocularis Malaise, 1931, and this species briefly compared withH. dahlbomi. Andrew Liston & Marko Prous, Senckenberg Deutsches Entomologisches Institut, Eber- swalder Str. 90, 15374 Müncheberg, Germany. E-mail: [email protected], mprous@ senckenberg.de Hege Vårdal, Swedish Museum of Natural History, Department of Zoology, Stockholm, Sweden. E-mail: [email protected] Since an earlier publication dealing with sawfly specimens are also referred to. Some of the lat- species newly recorded from Sweden (Prous et ter are from the excursions of the authors and al. 2014), records and observations of eight other their associates in Sweden, while others were such species have accumulated. As in the previ- collected by the Swedish Malaise Trap Project ous paper, the new data presented here concerns (SMTP). The background is explained in more sawfly species belonging to families and tenth- detail in the previous paper. As a matter of con- redinid subfamilies other than the Nematinae. venience, we also include notes on the taxonomy, The opportunity to examine these arose during distribution, and hosts of three nominal species work on the Swedish Nematinae, funded by the of Heptamelus (Heptamelidae) described by the Swedish Taxonomy Initiative (STI). In part, the renowned Swedish entomologists Carl Gustaf material studied was already deposited in ex- Thomson and René Malaise: note that the Hep- isting collections, but more recently collected tamelidae was elevated to family rank by Malm 119 Andrew Liston, Hege Vårdal & Marko Prous Ent. Tidskr. 139 (2018) & Nyman (2015). The type locality of the spe- are also hardly distinguishable (annulata Fig. 1a, cies described by Thomson is in Sweden, and nigripes Fig. 1b), even sharing the bands of fine the type localities of the two species described sensilla along the annular sutures described for by Malaise are in the Russian Far East. We con- nigripes by Schedl & Pschorn-Walcher (1984) cluded from our study of the type material, that and stated by them to distinguish that taxon from H. ussuriensis Malaise is a new junior synonym sorbi Schedl & Pshorn-Walcher, 1984, in which of H. dahlbomi (Thomson). Notes on how to such setae are not visible. Perhaps there is a dif- distinguish H. magnocularis Malaise from the ference in the marginal sensilla on the middle morphologically similar H. dahlbomi are also annuli, although too few specimens have been included. Although several taxonomic problems examined to state this with certainty: annulata still require study in this genus, we are confident has one or two sensilla, and if two, they are of that the present contribution is a step in the right very unequal length (Fig. 1a); nigripes has two direction. or three sensilla, and if three, two are of nearly equal length and longer than the third (Fig. 1b). Material and methods On the other hand, the differences in coloration The names of collections referred to in the text between annulata and nigripes are striking, and are abbreviated as follows: because no intermediate specimens have been MZLU Lunds universitet, Entomological found, it seems prudent to treat them provision- Museum, Lund, Sweden ally as separate taxa. The main differences are: NHRS Naturhistoriska riksmuseet, Stock- - Metatibia basally white (Fig. 1c). Intercostal cell holm, Sweden of fore wing much darker than rest of fore wing SDEI Senckenberg Deutsches Entomolo- membrane, except for the small but conspicuous gisches Institut, Müncheberg, Germany substigmal fleck (Fig. 2a). Setae on upper head annulata Information on the status in Sweden of host pale (Fig. 2c)........................................... - Metatibia entirely black / dark brown (Fig. 1d). In- plant species is based largely on the web pre- tercostal cell of forewing at most only slightly sentation “Den virtuella floran” (Anderberg & darker than rest of fore wing membrane, and sub- Anderberg 2012). stigmal fleck inconspicuous (Fig. 2b). Setae on The newly reported COI gene fragment upper head fuscous (Fig. 2d)..................nigripes (1078 bp) of one Heptamelus dahlbomi (Gen- Bank accession MG913289) was sequenced as Material examined described in Prous et al. (2016). Sweden: Småland, Hultsfred, Kloster Gård, 57.50°N 15.87°E, 100 m altitude, 1♂, 31.5.2013 (SDEI); Results Dalarna, Mora, Stenis 1km N, 60.95°N 14.47°E, 180 m altitude, 2♀, 14/16.06.2013 (NHRS, SDEI); Bor- ARGIDAE länge, Borlänge 11km NW, 60.55°N 15.22°E, 160 m Arge annulata Konow, 1891 altitude, 1♀, 16.6.2013 (SDEI). All specimens col- Arge annulata Konow, 1891: 42. Described: lected by Liston, Prous and Taeger. female. Type locality: Caucasus, Araxes-Thal Estonia: Viljandimaa, Sandra, 58.45°N 25.04°E, ♂ [Azerbaijan, Aras Valley]. Holotype, SDEI (ex- 25 m altitude, 1 , 7.6.2015, leg. A. Liston, M. Prous amined). & A. Taeger (SDEI) Germany: Brandenburg, Gatow / Oder, Feldwe- This was for many years recognised as a valid grand, Angelica archangelica, 53.10°N 14.33°E, 1♀, species, occurring in the Caucasus and southern 29.6.1999, leg. H.-J. Flügel (SDEI). Sachsen-Anhalt, Russia (e.g. Gussakovskij 1935, Muche 1977), Gohrau, Bresker Forst, Chaerophyllum temulum, until Zhelohovcev (1988) synonymised it with 51.81°N 12.48°E, 1♂, 28.05.2012, leg. W. Bäse Arge nigripes (Retzius, 1783). Schedl (2012) (SDEI). revoked this synonymy, and published the first There is currently no indication of which lar- European records, from Austria (Styria and val host plants are used by A. annulata. Many Carinthia). Arge species are frequent visitors to inflores- The external morphology of adult annulata cences of Apiaceae, and the species names of and nigripes is indeed very similar. Their lancets plants on the labels of the German specimens 120 Ent. Tidskr. 139 (2018) New and poorly-known sawflies from Sweden Figure 1. Arge annulata (DEI-GISHym19901) compared with A. nigripes (DEI-GISHym11562, Austria, Lower Austria, 01.09.2009, reared from larva on Rosa, leg. E. Altenhofer) (females). Part of lamnium of lancet, with serrula 2 the most basal at left – a) annulata, – b) nigripes. Lateral view, note colour of metatibia – c) annulata, – d) nigripes. Arge annulata (DEI-GISHym19901) jämförd med A. nigripes (DEI-GISHym11562, Österrike, Lower Austria, 01.09.2009, kläckta från larver på Rosa, leg. E. Altenhofer) (honor). Den sågtandade delen (=lamnium) på äggläggningsapparatens ventrala del (=lancet) där serrula 2 (= sågtand 2) syns längst nede till vänster. – a) annulata, – b) nigripes. Sedda från sidan, lägg märke till färgen på bakskenbenet, – c) annulata, – d) nigripes. presumably refer to this. Distribution: Trans- to A. sparta (MacGillivray, 1923) in the key caucasus and southern Russia, Austria (Schedl to Nearctic Arge by Smith (1989). These seem 2012), and the first records (above) from Ger- to be very similar in external characters, and many, Sweden, and Estonia. Arge annulata runs even their lancets strongly resemble each other 121 Andrew Liston, Hege Vårdal & Marko Prous Ent. Tidskr. 139 (2018) Figure 2. Arge annulata (DEI-GISHym19901) compared with A. nigripes (DEI-GISHym11562, Austria, Lower Austria, 01.09.2009, reared from larva on Rosa, leg. E. Altenhofer) (females). Fore wing, colour – a) annulata, – b) nigripes. Colour of setae on upper head – c) annulata, – d) nigripes. Arge annulata (DEI-GISHym19901) jämförd med A. nigripes (DEI-GISHym11562, Österrike, Lower Austria, 01.09.2009, kläckta från larver på Rosa, leg. E. Altenhofer) (females). Framvingefärg: – a) annulata, – b) nigripes. Behåringens färg ovanpå huvudet – c) annulata, – d) nigripes. in most respects (A. sparta: Fig. 87 in Smith Type material examined 1989). However, serrulae 2 and 3 [numbered Caenoneura dahlbomi. Lectotype, female, here from base] are hardly separated in sparta, but designated, MZLU: label data (Fig. 3a) include widely separated in annulata (Fig. 1a), and the an original label by Dahlbom “Sandhmr [=Sand- apical serrulae are more prominent in A. sparta. hammaren] 14 Aug [18]38; [?] säust. m. Phyll. amaura” and ”Caenoneura