Carpelimus (Trogophloeus) vilisus Gildenkov, 2019

Gildenkov, M. Yu., 2019, Five new species of the Genus Carpelimus Leach, 1819 from Thailand and the Philippines (Coleoptera: Staphylinidae: Oxytelinae), Russian Entomological Journal 28 (1), pp. 30-35 : 32-33

publication ID	https://doi.org/ 10.15298/rusentj.28.1.05
DOI	https://doi.org/10.5281/zenodo.10975991
persistent identifier	https://treatment.plazi.org/id/071D2011-6A68-FF87-FF12-3649EB89FCD4
treatment provided by	Felipe
scientific name	Carpelimus (Trogophloeus) vilisus Gildenkov
status	sp. nov.

Treatment

Carpelimus (Trogophloeus) vilisus Gildenkov View in CoL , sp.n.

Figs 2 View Figs 1–4 , 8, 9 View Figs 5–14 .

MATERIAL. Holotype, ♂ “ THAILAND:17./ 18.11.1995 Phrae Prov., Huai Kaet 50km NE Phrae, leg. Zettel (17b)” ( NHMW). Paratype: 1♀ “ THAILAND: 16.11.1995 Phrae Prov., Mae Khaem 15km E Phrae, ca. 350m, leg. Zettel (16b)” (cMG) .

DESCRIPTION (holotype). Length 1.8 mm. Colouration dark brown, legs and antennal bases yellow brown, darker to light brown towards antennal apex. Integument slightly shining, body with short, light-coloured hairs.

Head transverse, with a wide base, ratio of its length (from posterior margin of head to anterior margin of clypeus) to maximum width about 16:24. Neck constriction prominent. Eyes large, convex. Temples well-developed, round, eye diameter in dorsal view about 2.5 times as long as temple length. Head widest across eyes ( Fig. 2 View Figs 1–4 ). Head surface with delicate, fine and dense punctation. Diameter of punctures about 3.0 times as small as eye facet. Distances between punctures about equal to their diameter, interspaces smooth, slightly shining.

Antennae rather short, antennal segments 1–3 elongate; segments 4–7 about as long as wide; segments 8–10 slightly transverse; segment 11 elongate, conical. Last 3 segments more massive than others and form loose club ( Fig. 2 View Figs 1–4 ).

Pronotum widest about 2/3 its length from base, then narrowed. Lateral margin with barely noticeable notch at base, then smoothly rounded ( Fig. 2 View Figs 1–4 ). Ratio of pronotum length to its maximum width about 19:26. Surface of pronotum with delicate, fine and dense punctation; punctation similar to that on head. Pronotal disc with 2 pairs of prominent, symmetrical depressions and 1 unpaired oval depression along midline near apex. Base of pronotal disc with narrow, crescent-shaped depressions separated by medial ridge. Central part of disc with rather deep, oval depressions fused across midline to single butterfly-shaped depression ( Fig. 2 View Figs 1–4 ).

Ratio of length of elytra to their combined width about 30:34. Scutellum with shallow, round depressions ( Fig. 2 View Figs 1–4 ). Elytra with rather delicate, fine and dense punctation. Diameter of punctures about 1.5 times as small as eye facet. Distances between punctures slightly smaller than their diameter, interspaces smooth, slightly shining.

Abdomen delicately shagreened.

Aedeagus of characteristic structure ( Figs 8–9 View Figs 5–14 ).

Female. Sexual dimorphism absent, female morphologically similar to male. Spermatheca failed to isolate and its structure is unknown.

COMPARATIVE REMARKS. The new species is similar and closely related to C. notumus sp.n. and C. plenus sp.n. (see descriptions above and below). It differs from C. notumus sp.n. in having slightly more prominent eyes and from C. plenus sp.n. in having a significantly smaller body size and smaller punctation on the body surface. It differs markedly in the structure of the aedeagus ( Figs 5–6, 8–11 View Figs 5–14 ).

DISTRIBUTION. Thailand.

ETYMOLOGY. From Latin “vilis” (worthless, insignificant) referring to a small difference in its external appearance from C. notumus .