Zyras (Zyras) nigrorufus, 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 : 801-802

Zyras (Zyras) nigrorufus nov.sp. (Figs 14-17, 30-34)

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 nigrorufus sp. n. det. V. Assing 2019 " (cAss) . Paratypes: 3♂♂: same data as holotype (cAss) ; 1♂: " PHILIPPINES - Mindanao, Davao prov., Mt. Talomo, Catigan , 800-1000 m, 7°01'21''N, 125°22'31''E, 30.IV.-1.V.2019, Shavrin" (cAss) .

E t y m o l o g y: The specific epithet (Latin, adjective) alludes to the reddish-black coloration of the body.

D e s c r i p t i o n: Body length 6.5-8.5 mm; length of forebody 2.8-3.6 mm. Habitus as in Fig. 14. Coloration: head and pronotum reddish; elytra reddish with a more or less extensive postero-lateral spot not reaching posterior margins and suture; abdomen reddish with a transverse blackish band on tergite VII and sometimes also on tergite VI; legs pale-yellow; antennae reddish to blackish with the apical 3-5 antennomeres yellowish and the basal two antennomeres reddish.

Head (Fig. 15) weakly transverse; dorsal surface with rather sparse and moderately coarse punctures on either side of middle. Eyes large and moderately bulging, longer than postocular portion in dorsal view. Antenna (Fig. 16) 2.1-2.5 mm long; antennomeres IV approximately as long as broad, V as long as broad or weakly transverse, VI-X of gradually increasing width and increasingly transverse, X approximately 1.5 times as broad as long, and XI short, 1.5 times as long as broad, and of conical shape.

Pronotum (Fig. 15) approximately 1.1 times as broad as long and 1.3 times as broad as head, broadest anteriorly; lateral margins not sinuate in dorsal view; disc with moderately sparse and distinct punctation; microsculpture absent.

Elytra (Fig. 15) 0.75-0.80 times as long as pronotum; punctation very dense and rather coarse. Hind wings fully developed.

Abdomen (Fig. 17): tergites III-V anteriorly with shallow impression; these impressions with a transverse row of more or less distinct and more or less dense non-setiferous punctation; discs of tergites III-V with a lateral setiferous puncture on either side, with a median pair of setiferous punctures and with eight (tergites III-IV) or ten (tergite V) setiferous punctures bearing long black setae at posterior margins; tergite VI with a narrow transverse band of fine non-setiferous punctures at anterior margin, with a transverse row of 6-8 setiferous punctures, and with eight setiferous punctures bearing long black setae at posterior margin; tergite VII with a transverse band of numerous nonsetiferous punctures anteriorly, with a transverse series of setiferous punctures across middle, and a transverse series of setiferous punctures near posterior margin, setiferous punctures bearing long and thin yellowish setae, posterior margin with palisade fringe; tergite VIII with long black setae across posterior fourth.

♂: posterior margin of tergite VIII truncate or convex in the middle; posterior margin of sternite VIII convex; median lobe of aedeagus ( Figs 30-31 ) approximately 0.9 mm long; ventral process apically abruptly bent ventrad in lateral view; paramere ( Fig. 32 ) 0.9-1.0 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. nigrorufus belongs to the Z. hirtus group. It is distinguished from other species of this group by the coloration, by densely punctate elytra contrasting with a sparsely punctate head and pronotum, by the chaetotaxy of the abdomen, and by the shape of the aedeagus.

D i s t r i b u t i o n: The type specimens were collected in two localities ( Figs 33-34 ) in East Mindanao by sifting wet litter near running water in a secondary forest and in a stream valley at altitudes between 800 and 1000 m.

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).

Fig. 34: Locality Catigan (photo: A. Shavrin).