Zyras (Zyras) rasilis, Assing, 2019

Assing, Volker, 2019, Four new species and additional records of Lomechusini from Mindanao, Philippines (Coleoptera, Staphylinidae, Aleocharinae), Linzer biologische Beiträge 51 (2), pp. 789-802 : 794-798

Zyras (Zyras) rasilis nov.sp. (Figs 10-13, 27-29, 33)

T y p e m a t e r i a l: Holotype ♂: " PHILIPPINES - Mindanao, Araibo, Pantukan , Compostela V., Candalaga Mts. , 7°16'35''N, 126°10'13''E, 900 m, 4.V.2019, Shavrin / Holotypus ♂ Zyras rasilis sp. n. det. V. Assing 2019 " (cAss).

E t y m o l o g y: The specific epithet (Latin, adjective: smooth) alludes to the nearly impunctate head, pronotum, and abdomen.

D e s c r i p t i o n: Body length 8.4 mm; length of forebody 3.7 mm. Habitus as in Fig. 10. Coloration: head and pronotum dark-reddish; elytra pale-reddish; abdomen darkreddish with the posterior margins of the segments somewhat paler; legs pale-yellow with the apices of the mesofemora weakly and narrowly and the apical halves of the metafemora more distinctly infuscate; antennae blackish with antennomeres I-II and the base of III dark-reddish and with antennomere XI brown.

Head (Fig. 11) approximately 1.3 times as broad as long; posterior margin concave in the middle; dorsal surface impunctate except for few punctures near dorsal margins of eyes. Eyes large and bulging, longer than postocular portion in dorsal view. Antenna (Fig. 12) 2.4 mm long; antennomeres IV weakly transverse, V-X of gradually increasing width and increasingly transverse, X approximately 1.5 times as broad as long, and XI short, weakly oblong, and of conical shape.

Pronotum (Fig. 11) 1.15 times as broad as long and 1.15 times as broad as head, broadest anteriorly, weakly convex in cross-section; lateral margins sinuate in dorsal view; disc with a cluster of few punctures on either side of midline anteriorly and with a cluster of few punctures on either side of midline posteriorly, otherwise impunctate; microsculpture absent.

Elytra (Fig. 11) 0.75 times as long as, and much broader than pronotum, strongly widened posteriorly; punctation moderately sparse, relatively fine, and nearly regularly distributed. Hind wings fully developed.

Abdomen (Fig. 13): tergites III-V anteriorly with shallow impression; these impressions with indistinct and fine transverse row of sparse non-setiferous punctation; discs of tergites III-V with a lateral setiferous puncture on either side and with four fine setiferous punctures at posterior margin, otherwise impunctate; tergite VI with a transverse row of few fine non-setiferous punctures at anterior margin, with a lateral setiferous puncture on either side and with four fine setiferous punctures at posterior margin, otherwise impunctate; tergite VII with a narrow band of fine non-setiferous punctures anteriorly, with a lateral setiferous puncture on either side, and with several minute setiferous punctures at posterior margin, posterior margin with palisade fringe; tergite VIII with fine setiferous punctures confined to posterior margin and its vicinity, otherwise impunctate.

♂: posterior margin of tergite VIII concave in the middle; posterior margin of sternite VIII convex; median lobe of aedeagus ( Figs 27-28 ) 0.9 mm long and of robust shape; paramere ( Fig. 29 ) 0.95 mm long, apical lobe of paramere small and flattened.

C o m p a r a t i v e n o t e s: Based on the habitus, the short and conical antennomere XI, and the small and flattened apical lobe of the paramere, Z. rasilis belongs to the Z. hirtus group. It is distinguished from all other known species of this group by conspicuously sparse punctation and short pubescence of the head, pronotum, and abdomen alone.

D i s t r i b u t i o n: The type locality ( Fig. 33 ) is situated in East Mindanao, Philippines. The holotype was collected from wet leaf litter in a secondary forest near a river at an altitude of 900 m.

Figs 1-9: Drusilla bucina (1-5) and D. holoserica (6-9): (1, 6) habitus; (2, 7) male forebody; (3) female pronotum; (4, 8) antenna; (5, 9) abdomen. Scale bars: 1-2, 5-7, 9: 1.0 mm; 3-4, 8: 0.5 mm.

Figs 10-17: Zyras rasilis (10-13) and Z. nigrorufus (14-17): (10, 14) habitus; (11, 15) forebody; (12, 16) antenna; (13, 17) abdomen. Scale bars: 1.0 mm.

Figs 18-25: Drusilla bucina (18-20) and D. holoserica (21-25): (18-19, 23-24) median lobe of aedeagus in lateral and in ventral view; (20) spermatheca; (21) male tergite VIII; (22) male sternite VIII; (25) paramere. Scale bars: 21-22: 0.2 mm; 18-20, 23-25: 0.1 mm.

Figures

Figs 26-32: Drusilla bucina (26), Zyras rasilis (27-29), and Z. nigrorufus (30-32): (26) female tergite VIII; (27-28, 30-31) median lobe of aedeagus in lateral and in ventral view; (29, 32) paramere. Scale bars: 0.2 mm.

Fig. 33: Locality Compostela Valley (photo: A. Shavrin).