Zootaxa 4990 (1): 117–133 ISSN 1175-5326 (print edition) https://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2021 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4990.1.7 http://zoobank.org/urn:lsid:zoobank.org:pub:AD076194-6D97-4559-B6C9-E81CF0774BB0 The harvestmen fauna (Arachnida: Opiliones) of the Katunsky Biosphere Reserve and adjacent territories (South Siberia, Russia), with a description of a new species of Sabacon (Sabaconidae) and notes on Sabacon sergeidedicatum Martens, 1989 LAIMONAS A. TRILIKAUSKAS1 & GALINA N. AZARKINA2, * 1The Laboratory of Invertebrate Ecology, The Institute of Systematics and Ecology of Animals, Siberian Branch Russian Academy of Sciences, Frunze Street 11, Novosibirsk 630091, Russia. �[email protected]; https://orcid.org/0000-0003-4520-8529 2The Laboratory of Systematics of Invertebrate Animals, The Institute of Systematics and Ecology of Animals, Siberian Branch Russian Academy of Sciences, Frunze Street 11, Novosibirsk 630091, Russia and Department of Zoology & Centre for Invasion Biology, University of Venda, Thohoyandou, 0950, South Africa. *Corresponding author: �[email protected]; https://orcid.org/0000-0002-9328-3913 Abstract An annotated list of harvestmen species (six species in two families) of the Katunsky Biosphere Reserve and adjacent territories in the Altai Republic, Russia is provided. A new species, Sabacon zateevi sp. nov. (♂ ♀ from the Altai Mountains, Russia), is described. Liropilio stukanovi Gritsenko, 1979 is recorded from Russia for the first time, and appearance and diagnostic features of its male are described. The appearance of a living specimen of the female of Homolophus nordenskioeldi (C.L. Koch, 1879) is also provided. For all the studied species, biotope preferences and distribution are discussed. Additional information on morphology and distribution of Sabacon sergeidedicatum Martens, 1989 is given. Key words: Altai Mountains, Liropilio, Sabacon zateevi sp. nov., State Nature Reserve Introduction The study of Siberian harvestmen fauna began in the 19th century (Koch 1879), but information remains insufficient and uneven. In recent decades, only a few papers have been published on the harvestmen of Southern Siberia (e.g., Martens 1989; Tchemeris et al. 1999; Tsurusaki et al. 2000; Chemeris & Logunov 2001, Trilikauskas 2013, 2016, 2017; Tchemeris 2015). To date, focused research on the harvestmen fauna of specially protected natural regions of Russia has never been studied. The papers listed above contain scattered information on harvestmen from the Altai Mountains, and only a single record of Acanthomegabunus sibiricus Tsurusaki, Tchemeris & Logunov, 2000 near the northern border of the Katunsky Biosphere Reserve (Tchemeris 2015). The Katunsky Biosphere Reserve is located at the headwaters of the Katun’ River, in the Ust-Koksa District of the Altai Republic. Its territory includes the northern slopes of the Katunsky and Listvyaga Mountain Ranges (Map 1). The aims of the present paper are: (1) to provide a list of and to map all the harvestmen species recorded from the Katunsky Biosphere Reserve, (2) to illustrate Liropilio stukanovi Gritsenko, 1979, the first specimen found since its original description, (3) to provide photographs of living specimens of Homolophus nordenskioeldi (C.L. Koch, 1879) and L. stukanovi, (4) to illustrate and describe a new species of Sabacon from the Altai Republic of Russia, and (5) to provide additional information on the morphology and distribution of Sabacon sergeidedicatum Martens, 1989. Accepted by J. Shultz: 25 May 2021; published: 18 Jun. 2021 117 MAP 1. Records of Opiliones from the Katunsky Biosphere Reserve and neighbouring territories: 1—Katunsky Biosphere Reserve, head of Ozernaya River, shore of Taimenye Lake, near the ranger station; 2—Same locality, vicinities of Taimenye Lake, middle reaches of the Kharyuzovka River; 3—Same locality, NW shore of Taimenye Lake; 4—SE shore of Taimenye Lake; 5—Katunsky Biosphere Reserve, bank of Taimenye Lake near Soloukha River mouth; 6—Upper reaches of Katun’ River, Ozernaya River mouth; 7—Katunsky Biosphere Reserve, upper reaches of Katun’ River, left bank of Zaichikha River near its mouth; 8—same locality, 4 km NE of the ranger station. Material and methods A total of 437 specimens belonging to two families have been examined; all of them were collected by the first author (LT) by means of pitfall traps, sweep nets, and hand collecting in 2019–2020 except for those where authors are mentioned. The specimens were preserved and studied in 70% ethanol, and their colouration refers to that of preserved specimens. All drawings were made with the aid of a reticular eyepiece attached to an MBS–10 stereomicroscope. Ovipositors were detached and stained with Amido Black 10B. Digital images of preserved specimens were taken with a Canon EOS 550D attached to a Zeiss Stemi 2000–C stereomicroscope. Stacked images were combined using Helicon Focus 6.3 software. SEM micrographs were taken with SEM Hitachi TM–1000 at ISEA: material was mounted using adhesive and dried for a few hours. Photos of living specimens were taken with Canon EOS 1100D and Canon EOS 6D cameras. After photos were taken and drawings had been made, harvestmen body parts were placed into microvials and are stored with the corresponding specimens. The drawings were edited in Adobe Photoshop and CorelDraw. Map 2 was produced using the online mapping software SimpleMappr (Shorthouse 2010). The specimens studied in the present paper have been deposited in the following collections: ISEA—Institute of Systematics and Ecology of Animals, Novosibirsk, Russia (Curator G.N. Azarkina); MMUE—The Manchester Museum, The University of Manchester, UK (Curator D.V. Logunov); PCLT—Personal collection of L.A. Trilikauskas. 118 · Zootaxa 4990 (1) © 2021 Magnolia Press TRILIKAUSKAS & AZARKINA The terminology follows Suzuki (1983) and Martens (1978, 2015). All measurements are in millimetres (mm). Results Family Phalangiidae Latreille, 1802 Only four species of harvestmen, except for the five species listed below, Homolophus asiaticus Gritsenko, 1979, Opilio parietinus (De Geer, 1778), Homolophus pallens (Kulczyński, 1901), and Scleropilio insolens (Simon, 1895), are known to date from Russian part of Altai-Sayan Mountain region (Tchemeris et al. 1999; 2015; Tsurusaki et al. 2000a). Acanthomegabunus sibiricus Tsurusaki, Tchemeris & Logunov, 2000 Acanthomegabunus sibiricus Tsurusaki et al. 2000b: 74, figs 1– 4. Acanthomegabunus sibiricus Tchemeris 2015: 568, figs 1, 5, 14–15, 17. Comments. Acanthomegabunus sibiricus is the only species previously known from the Katunsky Biosphere Reserve. The species was recorded from the vicinity of Srednee Multinskoe Lake (erroneously named Srednee Kuktinskoe Lake) (Tchemeris 2015). The lake is actually located outside the reserve, close to its northern border where the reserve’s ranger station is situated, although this record requires confirmation because it is based on a single female. A closely related species, A. altaicus Tchemeris, 2015, may also occur there—its type locality lies close to the Katunsky Reserve (East Kazakhstan Area, Katon-Karagaiskii Districts). Habitat. Mountain moss-stony tundra, moss-pebble riverbanks, Abies forest, Anemone meadows, stony debris, dark coniferous forests, and aspen-fir forests (Tsurusaki et al. 2000b; Trilikauskas 2016, 2017). Distribution. The mountains of South Siberia, Russia: the southern part of Krasnoyarsk Territory, Altai Territory, and Altai Republic, Kemerovo Area, Khakassia, and Tuva (Tchemeris 2015). Homolophus nordenskioeldi (C.L. Koch, 1879) Figure 1 Farzalieva & Esyunin 2000: 193, figs 67–73. Tchemeris et al. 1999: 189, figs 1–7. Snegovaya & Cokendolpher 2021: 338, figs 28–29. Material examined. RUSSIA: Altai Republic: Ust’-Koksa District: 1 ♂ (ISEA O.001.0250), Katunsky Biosphere Reserve, upper reaches of the Katun’ River, left bank of Zaichikha River, near mouth, [49°37’08.3”N, 85°43’03.8”E], 1302 m a.s.l., 15–26.VIII.2020; 1 ♀ (ISEA O.001.0251), Katunsky Biosphere Reserve, c. 4 km NE of the Zaichikha ranger station, [49°36’25.6”N, 85°44’13.4”E], 1511 m a.s.l., 16.VIII.2020. Habitat. Dry valley meadow and synanthropic habitats (Tchemeris et al. 1999); scree, big stones near Salix, and grass thickets on small riverbanks (in Katunsky Biosphere Reserve). Distribution. Finland to Korea (Tchemeris et al. 1999). Liropilio stukanovi Gritsenko, 1979 Figures 2–15 Gritsenko, 1979: 266, figs 7–13 Material examined. RUSSIA: Altai Republic: Ust’-Koksa District: 1 ♂ (ISEA O.001.0288), Katunsky Biosphere OPILIONES OF KatunskY BIOSPHERE Reserve Zootaxa 4990 (1) © 2021 Magnolia Press · 119 Reserve, NW shore of Taimenye Lake, [49°49’35.9”N, 85°48’25.5”E], 1745–1760 m a.s.l., scree, 8.VIII.2019; 4 ♂, 1 ♀ (PCLT), Katunsky Biosphere Reserve, head of the Ozernaya River, shore of Taimenye Lake, near the ranger station, [49°48’40.9–42.9”N,85°47’57.2–57.6”E], 1509 m a.s.l., 10.VIII.2019; 2 ♂ (PCLT), upper reaches of the Katun’ River, mouth of Ozernaya River, [49°40’16.7”N, 85°41’49.6”E], 1268 m a.s.l., 14.VIII.2019. Comments. The species was described from the Ivanovsky Mountain Range in north-eastern Kazakhstan (Gritsenko 1979) and has not been found since; this is the first record for the species from Russia. The genus Liropilio is morphologically similar to Zacheus C.L. Koch but differs by the presence of a tubercle with denticles on the basal segment of the pedipalps (Figs 3–6) and an alate part on the penis, apically (Figs 11–15). Palpal femur, trochanter, and tibia of this species slightly thickened latero-apically, densely covered with short, stout setae. Palpal femur bordered dorso-apically, with two rows of teeth ventro-retrolaterally, tarsus covered with setae (Figs 3–4, 7–10). FIGURES 1–4. General appearances of the female of Homolophus nordenskioeldi (C.L. Koch, 1879) (1) and the male of Liropilio stukanovi Gritsenko, 1979 (2–4): 1–2 Live specimens; 3–4 Ethanol-preserved specimens, 3 Dorsal view, 4 Lateral view. Scales: 1 mm (3–4). 120 · Zootaxa 4990 (1) © 2021 Magnolia Press TRILIKAUSKAS & AZARKINA Habitat.