Carpelimus (Troginus) taipoensis Gildenkov, 2022

Gildenkov, Mikhail Yu., 2022, A new species of the subgenus Troginus Mulsant et Rey 1878 (Coleoptera: Staphylinidae: Oxytelinae: Carpelimus) from China, Zootaxa 5169 (5), pp. 481-484 : 483

Carpelimus (Troginus) taipoensis Gildenkov , sp. n.

( Figs. 1–2 )

Type material examined: Holotype, ♂: “ HONG KONG, Tai Po V.1996 | G. de Rougemont ” “ Flight interception trap ” “ Carpelimus exiguus gr. det. 199 G. de Rougemont ” ( MHNG).

Description. Measurements of the holotype: total length (from base of labrum to apex of abdomen): 1.45; maximum width of head including eyes: 0.31; length of head (from base of labrum to neck constriction along head midline): 0.26; length of antenna: 0.46; longitudinal length of eye: 0.09; length of temple (from posterior margin of eye to neck constriction): 0.09; length of pronotum: 0.24; maximum width of pronotum: 0.33; minimum width of pronotum: 0.23; length of elytra (length of elytra from shoulder to posterior margin): 0.43; maximum width of elytra: 0.41; maximum width of abdomen: 0.37; length of aedeagus: 0.27.

Body brown. Head, pronotum, elytra and antennae brown; abdomen black-brown; legs yellow-brown. Body slightly shining, with short, pale setae. Habitus as in Fig. 1 .

Head large, widest about level of eyes. Eyes small, slightly convex. Temples well developed, gently sloping; diameter of eye (if see dorsally) approximately equal to length of temple. Surface of head delicate and rather densely shagreened.

Antennae rather short, basal antennal segments large, cylindrical, about three times as long as its maximum broad; segment 2 large, conical, about twice as long as its maximum broad, visibly shorter than basal segment; segment 3 conical, slightly transverse; segments 4–10 strongly transverse; segment 11 elongate, conical; three apical segments more massive than preceding segments and forming loose club.

Pronotum with maximum broad after about 2/3 of its length, measured from the base, then narrowed. Lateral margins straight from base. Pronotum with delicate and rather densely shagreen as that on forehead. Pronotal disc with small and flattened depression at base; central part of disc with two symmetrical and poorly developed oval depressions, separated by flat medial ridge.

Elytra approximately as long as broad, markedly broader than pronotum. Elytra with rather delicate, fine and dense punctation. Diameter of punctures slightly finer than diameter of ommatidia. Distances between punctures slightly smaller than their diameter, interspaces smooth, slightly shining.

Abdomen with fine and smooth shagreen.

Aedeagus of characteristic structure ( Fig. 2 ).

Female. Unknown.

Differential diagnosis. Based on the habitus, a new species is most similar to C. (T.) atomus , widespread in China. Carpelimus (T.) taipoensis sp. n. can be distinguished from this species by the complete absence of punctures on the forehead and the pronotum. The new species well distinguished from other congeners by a completely different morphology of the aedeagus, which indicates the absence of close relationship between these species ( Fig. 1 ).

Distribution. China: Hong Kong.

Etymology. The species is named by its geographical distribution.

Figures

FIGURES 1–2. Carpelimus (Troginus) taipoensis sp. n. (holotype): 1—habitus (dorsal view); 2—aedeagus, ventral view. Scale bar: 1.0 mm (Fig. 1); 0.25 mm (Fig. 2).