Marin I.N., Palatov D.M. 2022. Uralocrangonyx gen.n. (Amphipoda: Crangonyctidae) from the Southern Ural, Russia // Arthropoda Selecta. Vol.31. No.2: 183–195 [in English].
A.N. Severtsov Institute of Ecology and Evolution of RAS, Moscow 119071, Russia. E-mails: coralliodecapoda@mail.ru , triops@yandex.ru
doi: 10.15298/arthsel. 31.2.07
ABSTRACT. Integrative analysis revealed that the stygobiotic Crangonyx chlebnikovi Borutzky, 1928 (Amphipoda: Crangonyctidae) from the Southern Ural, Russia, should be placed into a separate new genus, Uralocrangonyx gen.n. Together with the European Crangonyx subterraneus Bate, 1859 and Crangonyx paxi Schellenberg, 1935 as well as North American Bactrurus spp., the new genus forms the “Bactrurus” Clade according to the following morphological features: free urosomites; the dense armature of palm of gnathopods I–II; the absence of sternal gill/processes on pereonal segments II–III; and head with a concave anterolateral lobe bearing moderate inferior antennal sinus. At the same time, the new genus differs from the clade-related genera in the structure and armature of gnathopods I–II and the presence of 8–9 hooks in retinacules of uropods. The erection of this new genus changes the whole taxonomy of the Crangonyx-like species, and we propose to resurrect the generic name Eucrangonyx Stebbing, 1899 for North American Crangonyx sensu lato (with the type species Eucrangonyx gracilis (S.I. Smith, 1871)). Crangonyx islandicus Svavarsson et Kristjбnsson, 2006, endemic to Iceland, should be also allocated into a separate genus, since it is not related to the European Crangonyx Spence Bate, 1859 s.str. or any species of the Nearctic Eucrangonyx Stebbing, 1899, but belongs to the “Stygobromus” clade of the family Crangonyctidae.
KEY WORDS: Diversity, Crustacea, Amphipoda, Crangonyctidae, new genus, subterranean, Southern Ural, Russia.