Pinobius rossii, Assing, 2018

Assing, Volker, 2018, A revision of Pinobius. II. Three new species from Cambodia and Indonesia, and additional records (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 50 (2), pp. 997-1004 : 1002-1003

Pinobius rossii nov.sp. ( Figs 5-8 )

T y p e m a t e r i a l: Holotype ♂: " CAMBODIA - Kampong Chhnang prov., Kampong Chhnang env., Toul Ompel , 12°14'14''N, 104°41'15''E, light trap, 19+ 21.V.2018, leg. Bernardi, Kong & Rossi / Holotypus ♂ Pinobius rossii sp.n., det. V. Assing 2018" (cAss).

E t y m o l o g y: This species is dedicated to Walter Rossi (L'Aquila), in appreciation for the generous gift of all the Pinobius material treated in the present paper.

D e s c r i p t i o n: Body length 8.5 mm; length of forebody 4.5 mm. Habitus as in Fig. 5 . Coloration: forebody dark reddish-brown; abdomen dark-reddish with segments VI and VII somewhat infuscate; reddish-brown to dark-brown; legs dark-yellowish; antennae pale-reddish.

Head ( Fig. 6 ) 1.15 times as broad as long, broadest across eyes; lateral margins behind eyes weakly tapering posteriad in dorsal view; punctation moderately coarse and moderately sparse, somewhat sparser in median dorsal portion; interstices without microsculpture except for scattered micropunctation. Eyes somewhat longer than postocular region in dorsal view. Antenna approximately 2.3 mm long.

Pronotum ( Fig. 6 ) 1.07 times as long as broad and approximately as broad as head; lateral margins weakly convex in dorsal view; punctation similar to that of head; midline with moderately broad impunctate band.

Elytra ( Fig. 6 ) approximately as long as pronotum; punctation dense; interstices without microsculpture. Hind wings fully developed. Metatarsomere I approximately as long as the combined length of metatarsomeres II and III.

Abdomen narrower than elytra; punctation fine and rather dense; interstices with fine microsculpture; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII strongly convex.

♂: protarsomeres I-IV strongly dilated; sternite VII unmodified; sternite VIII with narrow and deep posterior excision; aedeagus ( Figs 7-8 ) 1.5 mm long, slender, and asymmetric; median lobe of distinctive shape, strongly curved in lateral view, somewhat asymmetric in ventral view, and with transparent apex; parameres thin, of subequal length, not reaching apex of median lobe, and apically with four setae.

♀: unknown.

C o m p a r a t i v e n o t e s: Like P. acutus , P. rossii belongs to the P. indicus group and, based on the similar modifications of the aedeagus (slender, strongly curved, and somewhat asymmetric median lobe with a transparent apex), it is evidently closely allied to P. acutus . It is reliably distinguished from other species of the P. indicus group only by the distinctive shape of the aedeagus. It additionally differs from the syntopic P. acutus and P. brevincisus as follows:

from P. acutus by smaller size, a relatively smaller and less transverse head, and by coarser and less dense punctation of the pronotum;

from P. brevincisus by slightly larger size and slightly longer elytra.

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: The type locality and other collection data are identical to those of P. acutus .

Figures

Figs 1-8: Pinobius acutus nov.sp. (1-4) and P. rossii nov.sp. (5-8): (1, 5) habitus; (2, 6) forebody; (3-4, 7-8) aedeagus in lateral and in ventral view. Scale bars: 1, 5: 2.0 mm; 2, 6: 1.0 mm; 3-4, 7-8: 0.5 mm.