Carpelimus (Bucephalinus) fereus Gildenkov 2019, sp.n.
Creators: name: Koch-Institut, Robert
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Carpelimus
Carpelimus fereus

description: Carpelimus (Bucephalinus) fereus Gildenkov, sp.n.   
Figs 5–7.  
MATERIAL. Holotype, ♂, Malaysia, Borneo: with labels “ SABAH: Crocker Ra. 1270 m, km 60 rte Kota Kinabalu-Tambunan 17.V.1987 Burckhardt - Löbl” (MHNG).  
DESCRIPTION (holotype). Length 1.8 mm. Colouration brown, legs and antennae yellow brown. 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 small, convex. Temples well-developed, round, eye diameter in dorsal view significantly (about 1.5 times) smaller than temple length. Head widest across temples (Fig. 5). Head surface with extremely delicate, very fine and dense punctation. Puncture diameter about 4.0 times as small as eye facet. Distances between punctures slightly smaller than their diameter, interspaces smooth, slightly shining. Antennae rather long, antennal segments 1–3 and 5 elongated; segments 4 and 6– 7 slightly elongated; segments 8–10 about as long as wide; segment 11 elongated, conical. Last 3 segments more massive than others and form loose club (Fig. 5).  
Pronotum widest about 2/3 its length from base, then narrowed. Lateral margin smoothly rounded (Fig. 5). Ratio of pronotum length to its maximum width about 19:26. Surface of pronotum with extremely delicate, very fine and dense punctation. Puncture diameter about 4.0 times as small as eye facet. Distances between punctures slightly smaller than their diameter, interspaces smooth, slightly shining. Pronotal disc with 2 pairs of prominent, symmetrical depressions merging across midline into 2 depressions (horseshoe-shaped near base and butterfly-shaped in central part of disc) and with 1 small, unpaired, oval depression apically along midline (Fig. 5).  
Ratio of length of elytra to their combined width about 27:32. Scutellum with weak, round depressions (Fig. 5). Surface of elytra with extremely delicate, very fine and dense punctation. Puncture diameter about 3.0 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 6–7).  
Female. Unknown.  
 COMPARATIVE REMARKS. The new species is very similar in colouration, body morphology, punctation patterns and depressions on the pronotal disc with species of the “ silvestris ” group [Gildenkov, 2014a, b; 2015; 2019a] and can belong to this group. It differs from Carpelimus silvestris (Cameron, 1918) and C. pseudosilvestris Gildenkov, 2014 that share the same habitats with the new species on Borneo in having shorter antennae and a slightly smaller body size. It can also be distinguished from C. pseudosilvestris by the shape of the depressions on the pronotum and from C. silvestris by more rounded temples. The new species clearly differs from all species of the “ silvestris ” group [Gildenkov, 2015: p.377, Figs 7, 9–10, 12; p.378, Figs 1, 3, 5) in the structure of the aedeagus (Figs 6–7).   
DISTRIBUTION. Malaysia: Borneo.  
 ETYMOLOGY. From Latin “fere” (approximately, almost); the name refers to a significant similarity of the new species to C. silvestris and C. pseudosilvestris.   
 Acknowledgements. The author wishes to thank all colleagues for making material available for study: Petr Baňař (MMBC) and Giulio Cuccodoro (MHNG). I also thank Kirill Makarov for taking the photographs (Moscow Pedagogical State University, Russia).
description: Published as part of Koch-Institut, Robert, 2019, Infektionsepidemiologisches Jahrbuch meldepflichtiger Krankheiten für 2018, pp. 370-372 in Russian Entomological Journal 28 (4) on pages 371-372, DOI: 10.25646/5978, http://zenodo.org/record/13164201