Carpelimus (Troginus) varius Gildenkov, 2018

Gildenkov, Mikhail Yu., 2018, A new species of the subgenus Troginus Mulsant et Rey 1878 (Coleoptera: Staphylinidae: Oxytelinae: Carpelimus) from Borneo, Zootaxa 4444 (3), pp. 347-350 : 347-349

Carpelimus (Troginus) varius Gildenkov , sp. n. ( Figs. 1−5 )

Type material examined: Holotype ♂: “BORNEO, Sabah, ca. 300m SAFE Project ii.–iii.2011 Logged forest/Palm oil N4°63´50´´–N4°77´16´´ E117°43´83´´–E117°70´31´´ Malaise/Pitfall Combination” “SAFE Project Ewers et al. 110223 - 201b 6017” “ Carpelimus det. 2015 G. de Rougemont” “Holotypus Carpelimus (Troginus) varius | des. M. Gildenkov, 2018 ” (cGR).

Paratypes: 1♀ “BORNEO, Sabah, ca. 300m xi.–xii.2011 Primary forest N4°73´38´´–N4°75´36´´

E116°94´74´´–E116°96´87´´ Malaise/Pitfall Combination” “ SAFE Project Ewers et al. 111108 -410b 019509” “ Paratypus Carpelimus (Troginus) varius | des. M. Gildenkov, 2018” (cGR); 1♂ “BORNEO, Sabah, ca. 300m SAFE Project xi.–xii.2011 Logged forest/Palm oil N4°63´50´´–N4°77´16´´ E117°43´83´´–E117°70´31´´ Malaise/Pitfall Combination” “ SAFE Project Ewers et al. 111114 -244b 017057” “ Carpelimus det. 2015 G. de Rougemont” “ Paratypus Carpelimus (Troginus) varius | des. M. Gildenkov, 2018” (cMG).

Description. Male (holotype): TL: 1.77; WH: 0.43; LH: 0.29; LA: 0.59; LE: 0.10; LT: 0.10; LP: 0.29; WPmax: 0.34; WPmin: 0.22; LEl: 0.37; WE: 0.43; WA: 0.36; LAed: 0.23.

Coloration brown. Head, pronotum, most of elytra and abdomen brown; antennae, legs and apices of elytra yellowish brown; scutellum light brown. Body slightly shining, with short, light-coloured setae.

Head large, widest between temples, wider than pronotum ( Fig 1 ). Eyes rather large, slightly convex. Temples welldeveloped, round, diameter of eye in dorsal view equal to length of temple. Surface of head densely shagreened. Antennae rather long, antennal segments 1–2 large, elongate; segment 3 elongate; segments 4–5 slightly elongate; segments 6–7 about as wide as long; segment 8 slightly transverse; segments 9–10 transverse; segment 11 elongate, conical. Last 3 segments more massive than others and form loose club ( Fig 1 ).

Pronotum widest in anterior 1/3, gradually widened from base ( Fig 1 ). Surface of pronotum densely shagreened as that on head. Base of pronotal disc with flat median depression, central part of pronotum with 2 small, symmetrical longitudinal depressions ( Fig 1 ).

Elytra rather short, only 1.3 times as long as pronotum. Surface of elytra with very delicate and dense, fine punctation, some punctures almost indistinct, microsculpture with grainy, shagreen-like appearance ( Fig 1 ).

Abdomen delicate and smoothly shagreened.

Aedeagus ( Figs 3, 4 ) with expanded apical portions of parameres and with poorly sclerotized structures of internal sac.

FIGURES 1–5 . (continued).

Female (paratype). Paler in coloration. Head, pronotum and most part of elytra light brown; abdomen brown; antennae, legs and apices of elytra yellowish brown. Female shows sexual dimorphism in body dimensions ( Fig. 2 ): TL: 1.75; WH: 0.30; LH: 0.23; LA: 0.57; LE: 0.07; LT: 0.07; LP: 0.29; WPmax: 0.31; WPmin: 0.19; LEl: 0.33; WE: 0.38; WA: 0.39; LSp: 0.09. Spermatheca of characteristic structure ( Fig 5 ).

Variation. The second male from the study material (paratype) is smaller and does not differ significantly from the female: TL: 1.65; WH: 0.30; LH: 0.23; LA: 0.56; LE: 0.09; LT: 0.07; LP: 0.27; WPmax: 0.30; WPmin: 0.19; LEl: 0.36; WE: 0.41; WA: 0.34; LAed: 0.20.

Differential diagnosis. The new species differs markedly from all representatives of the subgenus Troginus of the Oriental region by the shagreened surface of the head and pronotum, by the lack of distinct punctation on the elytra and by yellowish brown apices of the elytra. It can be easily distinguished from all representatives of Troginus by characteristic shapes and location of internal structures of the aedeagus.

Distribution. Borneo ( Malaysia).

Etymology. From Latin “ varius ” (motley, multi-coloured).

Figures

FIGURES 1–5. Carpelimus (Troginus) varius Gildenkov, sp. n.: 1— habitus of holotype, dorsal view; 2— habitus of paratype, dorsal view; 3— aedeagus, ventral view; 4— spermatheca; 4— aedeagus, lateral view. Scale bar: figs. 1, 2: 1 mm; figs. 3–5: 0.25 mm.