Marusik Yu.M.1,2, Fomichev A.A.3,4 2026. New data on spiders (Arachnida: Aranei) from northeastern Yakutia // Arthropoda Selecta. Vol.35. No.1: 135–146 [in English].
1 Institute for Biological Problems of the North RAS, Portovaya Str.18, Magadan 685000 Russia.
2 Department of Zoology & Entomology, University of the Free State, Bloemfontein 9300, South Africa.
3 Altai State University, Lenina Pr., 61, Barnaul 656049, Russia.
4 Tomsk State University, Lenina Pr., 36, Tomsk 634050, Russia.
Yuri Marusik: yurmar@mail.ru https://orcid.org/0000-0002-4499-5148
Alexander Fomichev: a.fomichov@mail.ru; https://orcid.org/0000-0001-9268-622X
doi: 10.15298/arthsel.35.1.15
ABSTRACT. New data on the spider fauna of northeastern Yakutia, Russia, are presented based on material collected from the Orulgan Mountain Range (Eveno-Bytantaysky District), an area previously lacking arachnological records. A total of 11 species from five families are reported, with annotations on their distribution and habitat preferences. Among the most notable findings, Alopecosa borea (Kulczyński, 1908) stat.n., a former subspecies of A. solivaga (Kulczyński, 1901), is elevated to species rank based on clear divergence in CO1 sequences and phylogenetic placement, despite minimal morphological differences from A. solivaga. The male of A. borea is described and illustrated for the first time, and the female is redescribed. Additionally, the taxonomic status of Pardosa groenlandica (Thorell, 1872) in northeastern Asia is discussed: specimens from Yakutia differ from Greenlandic representatives in the shape of the epigyne and lack of carapace pattern, suggesting that the Siberian population may represent a separate species. Other records include Aculepeira carbonarioides (Keyserling, 1892), Gnaphosa borea Kulczyński, 1908, Pardosa algens (Kulczyński, 1908), P. sodalis Holm, 1970, P. tesquorum (Odenwall, 1901), Rhysodromus alascensis (Keyserling, 1884), and Xysticus emertoni Keyserling, 1880, several of which are reported for the first time from the studied grid square. Pardosa lyrata is reported from northeastern Yakutia for the first time. Observations of Araniella displicata (Hentz, 1847) and R. alascensis on naleds (river icings) provide evidence of ballooning in adults.
KEY WORDS: Araneae, biodiversity, distribution, new combination, northeastern Yakutia, Orulgan Mt. Range, taxonomy, first male description, redescription.