Domene (Macromene) affimbriata, Assing, 2015

Assing, Volker, 2015, Three new species of Domene from China (Coleoptera: Staphylinidae: Paederinae), Beiträge Zur Entomologie = Contributions to Entomology 65 (1), pp. 31-39 : 32-34

Domene (Macromene) affimbriata spec. nov.

( Figs 1–12 , Map 1 )

Type material: Holotype : “ CHINA [22] – Yunnan, SE Pingbian, primary forest, 22°54'31"N, 103°41'44"E, 2100 m, 27.VIII.2014, V. Assing / Holotypus  Domene affimbriata spec. nov., det. V. Assing 2014 ” (cAss).

Paratypes: 1 : same data as holotype (cAss); 3 , 1 : same data as holotype, but leg. M. Schülke (cSch, cAss); 1 ex. without abdomen: “ CHINA [22a] – Yunnan, SE Pingbian, primary forest, 22°54'31"N, 103°41'44"E, 2100 m, 28.VIII.2014, V. Assing” (cFel) .

Etymology: The specific epithet (Latin, adjective: not fimbriate) alludes to the absence of a palisade fringe at the posterior margin of the male tergite VII.

Description: Body length 10.5–11.5 mm; length of forebody 5.7–6.1 mm. Forebody as in Fig. 1 . Coloration: body black, except for the reddish posterior margins of the abdominal segments VII and VIII; legs with the femora blackish-brown (base only slightly and narrowly paler), the protibiae brown to dark-brown, the meso- and metatibiae yellowish to yellowish-brown, and the tarsi dark-yellowish; antennae dark-reddish to reddish-brown (apical half usually slightly paler than basal half) with antennomere I more or less extensively blackish.

Head ( Fig. 2 ) approximately as broad as long or weakly transverse, widest behind eyes; punctation rather fine, distinctly umbilicate, and very dense, rendering the surface rather matt. Eyes approximately half as long as temples from posterior margin of eye to posterior constriction in dorsal view, or slightly longer. Antenna ( Fig. 3 ) 3.7–4.2 mm long and rather slender.

Pronotum ( Fig. 4 ) 1.15–1.22 times as long as broad and approximately 0.95 times as broad as head; median portion of lateral margins more or less subparallel in dorsal view; punctation similar to that of head, but slightly less fine; midline with interrupted narrow glossy line of variable length.

Elytra ( Fig. 5 ) 0.75–0.80 times as long as pronotum, each elytron with three more or less distinct and more or less irregular longitudinal narrowly elevated ridges; disc more or less distinctly impressed in the middle; suture elevated; macropunctation coarse, irregular, partly confluent, and partly somewhat seriate; interstices with irregular micropunctation, otherwise not microsculptured.

Hind wings reduced. Protarsomeres I–IV rather weakly dilated in both sexes, without sexual dimorphism.

Abdomen approximately as broad as elytra; punctation extremely fine and dense on tergites III–VI, even finer, but somewhat less dense on tergites VII and VIII; anterior impressions of tergites III–VI with coarse and somewhat irregular punctation; microreticulation distinct on tergites III–VI, shallow on tergites VII–VIII; posterior margin of tergite VII usually without palisade fringe (narrow rudiments in one specimen visible); tergite VIII with convex posterior margin.

: sternite VII ( Fig. 6 ) with unmodified pubescence, posterior margin broadly and weakly concave; sternite VIII ( Figs 7–8 ) 1.15–1.22 times as broad as long, posterior excision rather broad and shallow, on either side of this excision with a cluster of moderately modified black setae, postero-median portion without modified setae; aedeagus ( Figs 9–10 ) approximately 1.15 mm long; ventral process very slender, distinctly curved at apical third in lateral view; dorsal plate lamellate and moderately sclerotized, with long apical and very short, weakly sclerotized basal portion; internal sac with a semi-transparent apical structure and with additional membranous structures.

: sternite VIII ( Fig. 11 ) weakly transverse, posterior margin truncate in the middle; tergite IX ( Fig. 12 ) with rather long and apically acute postero-lateral processes; tergite X ( Fig. 12 ) posteriorly acute in the middle.

Comparative notes: Based on the external (surface of elytra very uneven and with irregular longitudinal ridges; hind wings and palisade fringe at the posterior margin of tergite VII reduced) and particularly on the male sexual characters (sternite VII without modified setae; sternite VIII with pair of clusters of modified setae posteriorly; aedeagus relatively small in relation to body size and with very slender ventral process), D. affimbriata is most closely allied to D. immarginata ASSING & FELDMANN, 2014 from western Yunnan ( Map 1 ), a species of the D. scabripennis group. The new species is distinguished from the similar D. immarginata by the somewhat finer punctation of the head and pronotum, the nearly completely blackish-brown femora ( D. immarginata : basal half reddish to dark-reddish), the distinctly shallower and broader posterior excision of the male sternite VIII, and the differently shaped ventral process of the aedeagus ( D. immarginata : ventral process curved in the middle), the shape of the posterior margin of the female sternite VIII ( D. immarginata : weakly convex in the middle), and by the slightly longer and more slender postero-lateral processes of the female tergite IX. For illustrations of D. immarginata see ASSING & FELDMANN (2014).

Distribution and natural history: The type locality is situated in the Dawei Shan Virgin Forest Park near Pingbian in southeastern Yunnan ( Map 1 ), not far from the border with Vietnam. The specimens were sifted from leaf litter in a primary subtropical broad-leaved forest at an altitude of 2100 m.

Figures

Map 1: Distributions ofthe namedDomenespecies inChinaandTaiwan (newspecies:blacksymbols),basedon literature(FELDMANN et al. 2014) and examined records: D. cuspidata (white circles); D. immarginata (white squares); D. praefigens (black circles); D. affimbriata (black square); D. emeiana (black star); other species pooled (white diamonds). For the individual distributions of the pooled species see ASSING & FELDMANN (2014) and FELDMANN et al. (2014).

Figs 1–12: Domene affimbriata spec. nov.: forebody (1); head (2); antenna (3); pronotum (4); elytra (5); male sternite VII (6); male sternite VIII (7); posterior portion of male sternite VIII (8); aedeagus in lateral view (9–10); female sternite VIII (11); female tergites IX–X (12). Scale bars: 1.0 mm.