Carpelimus (Trogophloeus) vilisus Gildenkov 2019, sp.n.
Creators: name: Gildenkov, M. Yu.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Carpelimus
Carpelimus vilisus

description: Carpelimus (Trogophloeus) vilisus Gildenkov, sp.n.
Figs 2, 8, 9.
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). 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).
Pronotum widest about 2/3 its length from base, then narrowed. Lateral margin with barely noticeable notch at base, then smoothly rounded (Fig. 2). 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).
Ratio of length of elytra to their combined width about 30:34. Scutellum with shallow, round depressions (Fig. 2). 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).
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).
DISTRIBUTION. Thailand.
ETYMOLOGY. From Latin “vilis” (worthless, insignificant) referring to a small difference in its external appearance from C. notumus.
description: Published as part of Gildenkov, M. Yu., 2019, Five new species of the Genus Carpelimus Leach, 1819 from Thailand and the Philippines (Coleoptera: Staphylinidae: Oxytelinae), pp. 30-35 in Russian Entomological Journal 28 (1) on pages 32-33, DOI: 10.15298/rusentj.28.1.05, http://zenodo.org/record/10919898