Sundaquedius abbreviatus Brunke, 2021

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

Sundaquedius abbreviatus Brunke sp. nov.

Figs 1D-F , 2A-F

Type locality.

35 km north of An Khê, near Buôn Lư ới village, Gia Lai, Vietnam [ca. 14.32, 108.58].

Type material.

Holotype (male, CNC): Vietnam, 35 km N An Khe, Buon Luoi, 2.VII.1984 / AJB0001487 [white label] / HOLOTYPE Sundaquedius abbreviatus Brunke, des. A. Brunke 2021 [red label] Paratypes (5, ZIN): same data as the holotype but with labels: PARATYPE Sundaquedius abbreviatus Brunke, des. A. Brunke 2021 [yellow label]. Identifiers: AJB0001334, AJB0001488-1491

Etymology.

The species epithet means ‘shortened’ or ‘reduced’, and refers to the shorter dorsal rows of punctures on the pronotum compared to S. nigropolitus .

Diagnosis.

Sundaquedius abbreviatus can be distinguished by the presence of only two or three punctures in the dorsal row of the pronotum.

Description.

Measurements. Male (n = 2): HW/HL 1.30-1.35; PW/PL 1.06-1.08; EW/EL 1.22-1.24; PW/HW 1.14-1.19; forebody length 4.9-5.4 mm. Female (n = 4): HW/HL 1.25-1.29; PW/PL 1.03-1.10; EW/EL 1.13-1.15; PW/HW 1.21-1.23; forebody length 4.7-5.0 mm.

Similar to S. nigropolitus and differing only in the following: antennomeres dark except apical three segments paler, becoming successively paler to antennal apex; maxillary and labial palpi paler, entirely medium reddish brown; head, without additional punctures between named punctures, distinctly transverse, more so in males, head also broader relative to pronotum in males; antennae overall more robust, with apical segments less strongly transverse; pronotum slightly to distinctly transverse, with two or three punctures in the dorsal row, third puncture, when present, smaller, sometimes rudimentary and without seta; elytra more transverse than in S. nigropolitus , and even more so in males, with two discal rows and without scattered additional punctures; abdominal tergites III and IV with distinct impressions, V with only vague impression; abdominal punctation slightly denser but punctures generally still well separated.

Male with sternite VII broadly but shallowly emarginate; sternite VIII with slightly deeper emargination and distinct, triangular impressed and glabrous area; tergite X elongate, with distinct shallow emargination, with many long setae at apex (Fig. 2D ); sternite IX with bulky, asymmetrical base, apex deeply emarginate (Fig. 2E ); median lobe of aedeagus in ventral view subparallel sided, narrowing to rounded, acute apex, paramere with broad base, becoming slender to strongly acute apex (Fig. 2A ); median lobe in lateral view with nearly straight ventral face, with short, rounded apical part (Fig. 2C ); apex of paramere with short, sparse paired row of marginal peg setae (Fig. 2B ); aedeagus with ventral paired copulatory sclerites broadest at base and strongly narrowed to sharp apex. Female tergite X similar to that of S. nigropolitus but with slightly narrower apex (Fig. 2F ).

Distribution.

Known only from the type locality in the central highlands of Vietnam.

Bionomics.

Nothing specific is known about this species but the type locality is at approximately 700-800 m, so this species likely occurs elsewhere in lower montane forests of central Vietnam and possibly adjacent Cambodia.

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).