Bolitogyrus temburong Brunke

Brunke, Adam J., 2017, A revision of the Oriental species of Bolitogyrus Chevrolat (Coleoptera, Staphylinidae, Staphylininae), ZooKeys 664, pp. 1-97 : 22-24

Bolitogyrus temburong Brunke sp. n. Figs 10 H–J, 20A (map)

Type material.

Holotype (♂, BMNH): BRUNEI, E 115°7' N 4°34', Kuala Belalong FSC, Dipterocarp forest, BM(NH) 1991-173 [printed] / Ground Malaise, 20A, 770m alt, 7.ii.92, N. Mawdaley NM302 [printed] / Holotype ♂, Cyrtothorax temburong Brunke, des. A. Brunke 2017 [red printed label] / AJB0000401 [identifier label].

Paratypes (1 ♂ 1 ♀, BMNH): same as holotype except, 440 m, ground malaise #13, 8.II.1992, AJB0000499; same as holotype except, 610 m, ground malaise #18, AJB0000500.

Diagnosis.

Among the members of the Caesareus Group: pronotum not entirely pale; elytra without dark spot (Fig. 1D); first two visible abdominal segments with distinct darkened area (Fig. 1D); median lobe in parameral view dilated to blunt apex (Fig. 10H).

Description.

Measurements ♂ (n = 2): HW/HL 1.37-1.44; PW/PL 1.43-1.52; EW/ EL 1.29-1.31; ESut/PL 0.93-0.94; PW/HW 1.13-1.13; forebody length 5.7-6.2 mm.

Measurements ♀ (n = 1): HW/HL 1.33; PW/PL 1.64; EW/ EL 1.30; ESut/PL 0.95; PW/HW 1.16; forebody length 6.0 mm.

Almost identical to Bolitogyrus proximus except: pronotum entirely black or with anterior angles orange, though variation similar to B. proximus may occur with more specimens; elytra slightly wider; elytra slightly longer proportionally than pronotum; median lobe in lateral view with apical portion thicker and flexed ventrad, median tooth situated more distally (Fig. 10I); median lobe in parameral view widened to a rounded, obtuse apex with outline bearing median tooth (Fig. 10H); paramere with more elongate and blunt apex (Fig. 10J).

Distribution.

Figure 20A. Currently known only from Brunei but probably more widely distributed at medium-low elevations in Borneo.

Bionomics.

Bolitogyrus temburong has been collected in February from lower montane forests at elevations ranging from 440-770m.

Etymology.

The species epithet recognizes Ulu Temburong National Park in Brunei and its conservation achievements.

Comments.

Bolitogyrus temburong likely represents the first of many undescribed Bolitogyrus species at medium elevations in Borneo. Based on the samples seen by the author, very limited micro-fogging of fungusy logs has been conducted on Borneo.