Borneodeuterus sannio, Kurbatov, Sergey A. & Cuccodoro, Giulio, 2015

Kurbatov, Sergey A. & Cuccodoro, Giulio, 2015, Revision of Neodeuterus Schaufuss and description of a new allied genus from Borneo (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4006 (2), pp. 374-382 : 380-381

Borneodeuterus sannio sp. n.

Type material. Holotype male labelled «Borneo, SO Sarawak, Bario, 1300m, litter, 6.X.2001, S. Kurbatov», in MHNG.

Description. Body 1,20 mm long, yellowish-brown, with pubescence about 0.05–0.06 mm long. Dorsal part of head sparsely covered with very fine or evanescent punctation, except occipital area and both sides of vertexal depression, which are densely covered with large punctation (distances between punctures much shorter than their diameters). Tentorial foveae narrow and deep; distance between them slightly wider than that between each fovea and nearest edge of eye. Eyes slightly longer that half of head length in lateral view, each with more than 40 facets. Antenna with pedicel slightly longer that wide; antennomeres 3−7 subequal in width and markedly narrower than pedicel; antennomere 3 elongate; antennomere 4 as long as wide; antennomeres 5−7 slightly transverse; antennomere 8 elongate, almost 2 times as long as wide, as wide as pedicel; antennomere 9 elongate, less than twice as long as wide, wider and slightly longer than antennomere 8; antennomere 10 more than twice as long as wide, wider than antennomere 9 and as long as 8 and 9 combined.

Pronotal disc densely covered with large punctures (distances between punctures much smaller than their diameters); median sulcus reaching neither antebasal fovea nor anterior pronotal margin. Elytral disc covered with punctures sparser and finer than those on pronotum, becoming slightly coarser near posterior margin; dorsal stria short and extending posteriorly at most to basal third of elytra. Metaventrite punctate. Abdomen finely punctate, except tergite 1 almost impunctate.

Tergite 1 with basal carinae well-marked, curved, nearly reaching posterior tergal margin; maximum distance between carinae about half of width of segment 1. Tergites 2 and 3 with basal carinae less obvious than those on tergite 1, straight, nearly reaching corresponding posterior tergal margin; distance between carinae about one third of width of corresponding segment. Protrochanters with long pointed and slightly curved projection. Abdominal sternite 7 and 8 as in Figs 15 and 16 , respectively. Aedeagus ( Figs 13–14 ) 0.130 mm long.

Measurements: HL = 0.23 mm; HW = 0.18 mm; HWmax = 0.33 mm; PL = 0.30 mm; PW = 0.36 mm; EL = 0.47 mm; EW = 0.58 mm.

Etymology. The epithet means «clown» in Latin.

Figures

FIGURES 13 − 16. Borneodeuterus sannio sp. n.; aedeagus in lateral (13) and dorsal (14) views; male abdominal sternite 7 (15) and 8 (16). Scale bars = 0.1 mm; 13 − 14 = up; 15 − 16 = down.