Sundaquedius nigropolitus (Cameron) Brunke, 2021

Brunke, Adam J., 2021, New relictual genera in Cyrtoquediini and Indoquediini (Coleoptera: Staphylinidae: Staphylininae), ZooKeys 1076, pp. 109-124 : 109

Sundaquedius nigropolitus (Cameron) comb. nov.

Figs 1A-C , 2G

Quedius (Sauridus) nigropolitus Cameron, 1937

' Quedius ' nigropolitus Cameron: Brunke et al. (2021) (in undescribed genus of Cyrtoquediini )

Type locality.

Blawan [sometimes ‘Belawan’], Ijen Plateau [no specific locality, ca. -7.98, 114.17], Bondowoso Regency, East Java, Indonesia.

Type material.

Holotype (female, NMUK): Type [circular label with red border] / leg H. Lucht, K.O. Blawan, Idjen-Plateau [Ijen Plateau] Java, 900-1500 mr., 12.I.1934 [printed label] / Q. nigropolitus Type Cameron [handwritten] / M. Cameron, Bequest, B.M. 1955-147. [printed label] / AJB0001486 [printed label] / HOLOTYPE Quedius nigropolitus Cameron, det. A. Brunke 2021 [red label] / Sudaquedius nigropolitus (Cameron) [white label], det. A. Brunke 2021

Diagnosis.

Sundaquedius nigropolitus can be easily recognized by the dorsal rows of the pronotum, which have seven or eight punctures in each row. The only other known species is allopatric.

Redescription.

Measurements ♀ (n = 1): HW/HL 1.23; PW/PL 0.94; EW/EL 1.06; PW/HW 1.13; forebody length 4.8 mm.

Body highly glossy, entirely black, except for yellowish brown apical antennomere, tarsi and apical maxillary and labial palpomeres, abdomen with iridescent sheen ranging from violet to blue.

Head distinctly transverse, with two or three additional punctures mediad of posterior frontal puncture (Fig. 1B ). Antennomeres 1-3 elongate, 4 subquadrate, 5 and 6 weakly transverse, 7-10 strongly transverse, 10 ~ 2 × as wide as long. Pronotum slightly elongate with seven or eight punctures in the dorsal row, with additional groups of scattered punctures between dorsal and sublateral rows, and between sublateral row and lateral margin (Fig. 1C ). Elytra transverse, with additional scattered punctures between the two discal rows (Fig. 1A ). Abdominal tergites III-IV with distinct basal impression, tergites III-V with median or medioapical glabrous or sparsely punctate areas, these areas successively becoming smaller toward the apex; abdominal punctures generally coarse, nearly all separated by at least their diameters; tergites with exceedingly fine and dense microsculpture of transverse waves.

Male unknown. Female with tergite X triangular, with slightly narrowed but broadly rounded apex, apical half with many long setae (Fig. 2G ).

Distribution.

Known only from the type locality in East Java, which is at the northern edge of the plateau.

Bionomics.

Nothing is known about this species’ microhabitat preferences.

Comments.

The holotype of this species was one of the few specimens included from East Java in Cameron’s (1937) 'Fauna Javanica’. This region is still extremely poorly collected for Staphylinidae , even more so than West or Central Java.

Figures

Figure 1. Sundaquedius Brunke A-C S. nigropolitus (Cameron) D-F S. abbreviatus Brunke A, D habitus B, E dorsal head, arrows indicating anterior and posterior frontal punctures, asterisks indicating parocular punctures C, F dorsal pronotum, arrows indicating punctures of the dorsal row. Scale bars: 1 mm.

Figure 2. Sundaquedius Brunke A-F S. abbreviatus Brunke G S. nigropolitus (Cameron) A aedeagus, ventral view B apex of paramere, underside C aedeagus, lateral view (paramere removed) D male tergite X E male sternite IX F, G female tergite X. Scale bars: 0.25 mm (A-C); 0.5 mm (D-G).