Pseudolathra bisinuata, Assing, 2014

Assing, V., 2014, A revision of Palaearctic and Oriental Pseudolathra. IV. New species, new combinations and additional records (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 46 (2), pp. 1151-1166 : 1162-1165

Pseudolathra bisinuata nov.sp.

( Figs 20-27 , 29-30 , Map 2 )

Type material: Holotype: " Borneo Sabah, Kinabatangan , 22.VIII.2005, LF, leg. W. Mey & Ebert / Holotypus Pseudolathra bisinuata sp.n., det. V. Assing 2014" ( MNHUB).

Etymology: The specific epithet (Latin, adjective) alludes to the conspicuously bisinuate posterior margin of the male sternite VIII.

Description: Body length 9.7 mm; length of forebody 5.0 mm. Habitus as in Fig. 20 . Coloration: head dark-brown; pronotum and elytra reddish-brown, the latter with the posterior angles only very indistinctly and diffusely infuscate; abdomen brown with paler apex; legs dark-yellowish; antennae reddish.

Head ( Fig. 21 ) approximately as broad as long, of subquadrangular shape, with sharply marked posterior angles; lateral margins subparallel in dorsal view; punctation coarse, not umbilicate, rather dense in lateral and posterior dorsal portions, sparse in median and anterior dorsal portions, with interspersed micropunctation; interstices without microsculpture in median and anterior dorsal portions, with distinct microsculpture in lateral and in posterior dorsal portions. Eyes moderately large and moderately convex, but only little more than half as long as postocular region in dorsal view. Antenna slender, 3.4 mm long; all antennomeres oblong; V-X of subequal length and with distinctly constricted bases.

Pronotum ( Fig. 21 ) 1.05 times as long as broad and nearly as broad as head; lateral margins very weakly converging posteriad; punctation similar to that of head, but less dense and without distinct micropunctation; separate dorsal series absent; impunctate midline rather broad.

Elytra ( Fig. 21 ) 1.07 times as long as pronotum; punctation shallow, arranged in longitudinal series. Hind wings fully developed. Legs rather short; metatarsomere I short and weakly oblong, approximately as long as II; protarsomeres I-IV strongly dilated.

Abdomen slender, approximately 0.8 times as broad as elytra; punctation fine, moderately dense on tergites III-VI, somewhat sparser and finer on tergite VII, very sparse on tergite VIII; interstices with distinct microreticulation; posterior margin of tergite VII with pronounced palisade fringe.

: postero-lateral processes of tergite IX ( Fig. 30 ) strongly asymmetric, left process (dorsal view) much longer than right process; sternite VII ( Fig. 23 ) moderately transverse, posterior margin weakly concave, pubescence sparse, near middle of anterior margin with a cluster of gland openings; sternite VIII ( Fig. 24 ) weakly transverse, posteriorly produced, posterior excision broad and very shallow, thus rendering the posterior margin bisinuate; aedeagus ( Figs 25-27 ) approximately 1.5 mm long, rather weakly sclerotized, and symmetric (except for internal structures); ventral process with semi-membranous apex; internal sac with a conspicuous assortment of dark structures of various shapes.

Comparative notes: Like the preceding species, P. bisinuata evidently belongs to the P. quadriceps group. It differs from the other species of this group particularly by the morphology of the male tergite IX, the conspicuously shaped posterior margin of the male sternite VIII, and by the morphology of the aedeagus.

Distribution and natural history: The type locality is situated somewhere in the Kinabatangan river valley in Sabah, North Borneo, Malaysia ( Map 2 ). The holotype was collected at a light source.

Figures

Map 2: Distributions of Pseudolathra armata (black triangles), P. bisinuata (star), P. sepikensis (white circle), P. naviculum (black circle), P. puncta (white triangle), and P. cyanea (diamond).

Figs 18-27: Pseudolathra armata nov.sp. (18-19) and P. bisinuata nov.sp. (20-27): (18, 23) male sternite VII; (19, 24) male sternite VIII; (20) habitus; (21) forebody; (22) antenna; (25-26) aedeagus in lateral and in ventral view; (27) apical portion of aedeagus in ventral view. Scale bars: 20-22: 1.0 mm; 18-19, 23-27: 0.5 mm.

Figs 28-30: Pseudolathra armata nov.sp. (28) and P. bisinuata nov.sp. (29-30): (28-29) anteromedian portion of male sternite VII; (30) male segments IX-X. Scale bars: 0.2 mm.