Carpelimus (Bucephalinus) filous Gildenkov, 1952

Gildenkov, M. Yu., 2020, Eight new species of the genus Carpelimus Leach, 1819 from Indonesia (Coleoptera: Staphylinidae: Oxytelinae), Russian Entomological Journal 29 (1), pp. 53-60 : 56-58

Carpelimus (Bucephalinus) filous Gildenkov , sp.n.

Figs 5 , 17–19 .

MATERIAL. Holotype, ♂, West Papua “ INDONESIA. Irian Jaya Jayapura district Genyem. , 50 m NN, IV–V.1999, leg. M.Balke ” ( NKME). Paratypes: 1♂ “ INDONESIA. Irian Jaya Nabire distr., 150 m NN, Cemara River , VIII. 1998, leg. M.Balke ” ( NKME); 3♂♂, 4♀♀ “ INDONESIA. Irian Jaya Jayapura district Genyem. , 50 m NN, IV–V. 1999, leg. M.Balke ” ( NKME; cMG — 2♂♂) .

DESCRIPTION (holotype). Length 2.5 mm. Entirely black; legs and antennae dark 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 21:32. Neck constriction prominent. Eyes large, convex, occupying almost entire lateral sides of head, temples barely developed ( Fig. 5 ). Head surface with very delicate, extremely fine and dense punctation. Puncture diameter more than 7 times as small as eye facet. Distances between punctures about equal to their diameter, interspaces slightly shagreened, separate punctures in some places difficult to distinguish. Antennae long, with lengths of all antennal segments noticeably or significantly longer than their width ( Fig. 5 ).

Pronotum widest about 2/3 its length from base, then narrowed. Lateral margins straight from base, then smoothly rounded ( Fig. 5 ). Ratio of pronotum length to its maximum width about 27:34. Surface of pronotum with very delicate, extremely fine and dense punctation, similar to that on head, but more distinct. Puncture diameter more than 7 times as small as eye facet. Distances between punctures about equal to their diameter, interspaces smooth, slightly shining. Pronotal disc with 1 barely noticeable oval flattening along midline at apex and 2 pairs of rather pronounced, symmetrical depressions: 1 pair of narrowly crescent-shaped depressions, merging across pronotal midline to form a single round, deep depression near disc base and 1 pair of longitudinal, bean-shaped depressions, with slightly diverging apices, on either side of midline in central part of disc ( Fig. 5 ).

Ratio of length of elytra to their combined width about 43:48. Scutellum with weak, round depressions ( Fig. 5 ). Surface of elytra with delicate, fine and dense punctation. Puncture diameter about 5 times as small as eye facet. Distances between punctures about equal to their diameter, interspaces smooth, slightly shining.

Abdomen delicately shagreened.

Aedeagus of characteristic structure ( Figs 17–18 ).

Female. Sexual dimorphism absent, female morphologically similar to male.

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Spermatheca of characteristic structure ( Fig. 19 ).

COMPARATIVE REMARKS. The new species is similar to Carpelimus (Bucephalinus) chagosanus (Bernhauer, 1922) in colouration, size and body morphology, but it can be clearly distinguished by the structure of the aedeagus, especially by long, characteristically curved parameres. The new species is also similar to C. (B.) longifilous (see below), but differs in a smaller body size and in the details of aedeagus morphology ( Figs 17–18 ).

DISTRIBUTION. Indonesia, Western New Guinea.

ETYMOLOGY. From Latin “filo” (thread, stretch into a thread); the name refers to the structure of parameres; they are long and thin at their apices.

Figures

Figs 4–6. Carpelimus (Bucephalinus) spp., holotypes, males, dorsal view: 4 — Carpelimus jayapurensis, sp.n.; 5 — Carpelimus filous, sp.n.; 6 — Carpelimus longifilous, sp.n. Рис. 4–6. Carpelimus (Bucephalinus) spp., голотипы, самцы, сверху: 4 — Carpelimus jayapurensis, sp.n.; 5 — Carpelimus filous, sp.n.; 6 — Carpelimus longifilous, sp.n.

Figs 7–19. Genitalia of Carpelimus: 7–9 — C. moluccanensis, sp.n.; 10–11 — C. ibelensis, sp.n.; 12–13 — C. irianensis, sp.n.; 14– 16 — C. jayapurensis, sp.n.; 17–19 — C. filous, sp.n.; 7, 10, 12, 14, 17 — aedeagus, ventral view (holotypes); 8, 11, 13, 15, 18 — aedeagus, lateral view (holotypes); 9, 16, 19 – spermatheca (paratypes). Scale bar: 0.25 mm. Рис. 7–19. Гениталии Carpelimus: 7–9 — C. moluccanensis, sp.n.; 10–11 — C. ibelensis, sp.n.; 12–13 — C. irianensis, sp.n.; 14– 16 — C. jayapurensis, sp.n.; 17–19 — C. filous, sp.n.; 7, 10, 12, 14, 17 — Эдеагус, сниЗу (голотипы); 8, 11, 13, 15, 18 — Эдеагус, сбоку (голотип); 9, 16, 19 – сперматека (паратипы). Масштаб: 0,25 мм.