Thinodromus (s.str.) bimeensis Gildenkov, 2021

Gildenkov, M. Yu., 2021, New species of the genus Thinodromus Kraatz, 1857 from New Guinea (Coleoptera: Staphylinidae: Oxytelinae), Russian Entomological Journal 30 (2), pp. 149-152 : 150-151

Thinodromus (s.str.) bimeensis Gildenkov , sp.n.

Figs 4–7 .

MATERIAL. Holotype, ♂, Indonesia, West Papua: with labels “ IRIAN JAYA: 22.9.1993 Bime–Calab Gebiet Bime 1400m ” “ca. 140°12´E 04°20´S, leg. M. Balke (16)” ( NHMW). Paratypes: 1♀ “ IRIAN JAYA: 22.9.1993 Bime–Calab Gebiet Bime 1400m ” “ca. 140°12´E 04°20´S, leg. M. Balke (16)” ( NHMW) .

DESCRIPTION (holotype). Length 3.5 mm. Colouration brown. Integument slightly shining, body with fairly long light-coloured seta.

Head transverse, with a wide base, ratio of its length (from posterior margin of head to anterior margin of clypeus) to maximum width is about 23:40. Neck constriction prominent. Eyes large, convex, occupying almost entire lateral side of head; eye diameter in dorsal view about 3.5 times longer than temples, head widest across eyes ( Fig. 4 ). Head surface with rather clearly, fine and dense puncturation. Diameter of punctures about 2.0 times smaller than diameter of eye facet. Distance between punctures slightly smaller than their diameter, interspaces smooth, slightly shining ( Fig. 4 ). Antennae rather long, 1–9th antennal segments longer than their width; 10th — about as long as wide ( Fig. 4 ).

Pronotum heart-shaped, reaches its greatest width after about 2/3 of the length measured from the base, then narrowed ( Fig. 4 ). Ratio of pronotum length to its maximum width about 37:48. Surface of pronotum with rather clearly, fine and dense puncturation. Diameter of punctures about 4 times smaller than diameter of the eye facet. Distances between punctures are significantly smaller than their diameter, interspaces smooth, slightly shining ( Fig. 4 ). Base of pronotal disc with distinct horseshoe-shaped depression ( Fig. 4 ); central part of disc with 2 symmetrical distinct weakly developed oval depressions.

Ratio of length of elytra to their combined width about 69:77. Elytra with clearly, fine and dense puncturation. Diameter of punctures is slightly larger than diameter of eye facet. Distance between punctures much smaller than their diameter, interspaces smooth, slightly shining ( Fig. 4 ).

Abdomen with fine and rather dense puncturation. Aedeagus of characteristic structure ( Figs 5–6 ).

Female. Sexual dimorphism absent, female morphologically similar to male. The colouration is darker than that of the holotype — dark-brown; legs and antennae brownish. Spermatheca of characteristic structure ( Fig. 7 ).

COMPARATIVE REMARKS. The new species is very similar to Thinodromus (s.str.) shavrini Gildenkov, 2020 described from the Philippines, but distinguished by a wider body and less long antennae; reliably distinguished by the structure of the aedeagus, especially by the structure of parameres [ Figs 5, 6 ; Gildenkov, 2020: Figs 10–11]. The new species is also similar to Thinodromus (s.str.) kelabitensis Gildenkov, 2021 , described from Borneo, but distinguished by a wider body, less long antennae, smaller and denser puncturation of the head, pronotum, and elytra, and much denser puncturation of the abdomen. The new species is reliably distinguished by the structure of the aedeagus, especially by the structure of parameres [ Figs 5–6 ; Gildenkov, 2021: Figs 3–4 ).

DISTRIBUTION. Indonesia, West Papua.

ETYMOLOGY. The new species is named due to its geographical distribution.

Acknowledgements. The author wishes to thank all colleagues for making material available for study: Harald Schillhammer (NHMW), Alfred F. Newton, Margaret K. Thayer and James H. Boone (FMNH). I also thank Kirill Makarov for taking the photos (Moscow Pedagogical State University, Russia).

Figures

Figs 4–7. Thinodromus (s.str.) bimeensis, sp.n.: 4 — holotype, male, dorsal view: 5–6 — aedeagus, holotype (5 — ventral view; 6 — lateral view); 7 — spermatheca, paratype. Scale bar: 0.25 mm. Рис. 4–7. Thinodromus (s.str.) bimeensis, sp.n.: 4 — голотип, самец, сверху: 5–6 — Эдеагус, голотип (5 — сниЗу; 6 — сбоку); 7 — сперматека, паратип. МасШтаб: 0,25 мм.

Figs 1–3. Thinodromus spp.: 1–2 — Thinodromus antarcticus (Bernhauer, 1920), syntyp, female (1 — habitus, dorsal view; 2 — spermatheca; 3 — Thinodromus inflatipes (Oke, 1933), dorsal view (after Oke, 1933: 106, fig. 21). Scale bar: 0.1 mm. Рис. 1–3. Thinodromus spp.: 1–2 — Thinodromus antarcticus (Bernhauer, 1920), синтип, самка (1 — внеШний вид, сверху; 2 — сперматека); 3 — Thinodromus inflatipes (Oke, 1933), сверху [по Oke, 1933: 106, fig. 21]. МасШтаб: 0,1 мм.