Subisotoma tenuis Dunger 1982

• Main Authors: Potapov, Mikhail, Babenko, Anatoly, Fjellberg, Arne, Greenslade, Penelope
• Format: Other/Unknown Material
• Language: unknown
• Published: 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Entognatha; Collembola; Isotomidae; Subisotoma; Subisotoma tenuis; Indigirka; Suntar; Ust-Nera; Kyubyume; Makarova; Yakutia
• Online Access: https://zenodo.org/record/5687495; https://doi.org/10.5281/zenodo.5687495

Subisotoma tenuis (Dunger, 1982) Figs 1, 29, 32, Tab. 2 Proisotoma (s.str.) tenuis Dunger, 1982: 51 Material. 2 paratypes, Mongolia, Central Aimak, sample 760 in Dunger (1982) (SMNG), 11 specimens, Russia, Buryatia, Vitim Plateau, Telemba, birch forest mixed with larch, 06.i. 2008, leg. А. Chimitova; 7 specimens, Russia, Irkutsk Province, W Khamar–Daban Range, Cherskogo Peak, rocks, steep northern slope, cold mossy shelves in permanent shadow, 2000 m alt., 26.viii. 2008, leg. M. Potapov, 1 specimen, Russia, Yakutia, middle reaches of Indigirka river, Ust'–Nera, 800 m alt., mosses and litter on stones, 21.vii. 1992, leg. M. Potapov (MSPU); 1 specimen, Russia, Yakutia, Suntar–Khayata Mt. Range, Kyubyume River, 1250 m alt., bog, 30.vii. 2002, leg. O. Makarova (MSPU). Redescription. Size 1.2–1.3 mm. Colour almost-black, with numerous light spots. Ventral side and appendices also coloured. Cuticular big pits regularly scattered all over body, larger on head (as in Fig. 53). Ocelli 8 + 8, H and G clearly smaller. PAO small, narrow elliptical, without constriction, 1.5–2.0 as long as ocellus diameter and 0.6–0.8 as long as inner unguis. Maxillary palp simple, 4 sublobal chaetae present. Labral formula as 2 / 554. Labium with papillae A–E present, papilla Е with 6 guard chaetae (е 7 absent), proximal part of labium with 3 chaetae, basomedian and basolateral fields with 4 and 5 chaetae as usual. Ventral side of head with (4) 5 + 5 postlabial chaetae. Ant. 1 with 2 bms, dorsal and ventral, and 2 ventral sensilla (s), Ant. 2 with 3 bms and 1 distal s, Ant. 3 with 1 bms and 5 distal s, including 1 lateral (= АО), “inner” sensilla of АО clearly broadened. One additional sensillum present on dorsal side of Ant. 3 (Fig. 29). Ant. 4 with numerous poorly differentiated sensilla, subapical organite small, microsensillum present. All terga with dense cover of short, uniform chaetae, macrochaetae not developed. Dorsal axial chaetom as 11–13,9 – 11 / 7–8,7 – 8,7–9. Tergal sensilla shorter and finer than ordinary chaetae. ...