Scutisotoma indigirka Potapov & Babenko & Fjellberg 2006, sp.n.

• Main Authors: Potapov, Mikhail, Babenko, Anatoly, Fjellberg, Arne
• Format: Other/Unknown Material
• Language: unknown
• Published: 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Collembola; Entomobryomorpha; Isotomidae; Scutisotoma; Scutisotoma indigirka; Indigirka; Ust-Nera; Yakutia
• Online Access: https://zenodo.org/record/5073714; https://doi.org/10.5281/zenodo.5073714

Scutisotoma indigirka sp.n. Figs. 139–142 Material. Holotype: ♀, Russia, Yakutia, Oimyakon Province, middle part of Indigirka river, near Ust’-Nera village. (64 o 33’N, 143 o 13’E), 1600 m alt., northern slope, mosses and lichen on stones, 22.vii.1992, leg. M. Potapov. Paratypes: 15 exx., same sample (MSPU). Description. Size 0.6–0.9 mm. Colour rather light, yellowish-brown, eye spots and apical part of antennae darker. Cuticle with fine primary granulation. Ocelli 8+8, G and H smaller. PAO elliptical, rather wide and not constricted, about 2.0–2.5 as long as ocellus diameter and 0.9–1.3 as long as U 3. Maxillary outer lobe with 4 sublobal hairs and simple maxillary palp. Labral formula 3/554. Labium with all 5 papillae present, papilla E without guard e 7. Proximal field with 3 chaetae, basomedian field with 4. Ventral side of a head with 3+3 postlabial chaetae. Ant.1 with 2 basal microsensilla (bms, dorsal and ventral), and 2 ventral sensilla (s). Ant.2 with 3 bms and 1 laterodistal s, Ant.3 with 1 bms and 5 distal s (AO and one lateral s). Guard sensilla of AO clearly larger than inner pair of sensilla. Additional sensilla on Ant. 2–3 in males not observed. Sensilla on Ant.4 hardly differentiated, subapical organite small. Dorsal axial chaetom of Th.II–Abd.III as 6–7,6/334. Thorax without ventral axial chaetae. Macrochaetae differentiated only laterally on Th.II–III and on tip of abdomen. Medial macrochaetae on Abd.V are about 0.4 as long as tergite. Sensilla on tergites clearly differentiated, shorter than ordinary chaetae. Sensillary formula 33/22224 (s) and 11/111 (ms). Sensilla on Abd.I–III in mid-tergal position (medial sensillum on Abd.III in posterior 1/3 of the tergite). Microsensillum on Abd.III set close to the lateral sensillum (Fig. 141). On Abd.V the lateral pair of sensilla (accp3 and accp4) clearly thicker and one of them moved anteriorly (Fig. 142). Unguis simple without inner tooth. Ti.1–3 usually with the basic set of chaetae (21-21- 25). B-row on Ti.1–2 with 7 chaetae. Chaetae x and B 5 on ...