Zyras (Zyras) truncatus, Assing, 2017

Assing, Volker, 2017, On Zyras sensu strictu in the East Palaearctic and Oriental regions, with a focus on the faunas of the Himalaya, India, Sri Lanka, Thailand, and Sulawesi (Coleoptera: Staphylinidae: Aleocharinae: Lomechusini), Beiträge Zur Entomologie = Contributions to Entomology 67 (1), pp. 117-192 : 136-137

publication ID	https://doi.org/ 10.21248/contrib.entomol.67.1.117-192
publication LSID	lsid:zoobank.org:pub:FD33C1AE-F7D9-4E3A-A053-A2CAA7261CFE
DOI	https://doi.org/10.5281/zenodo.5888413
persistent identifier	https://treatment.plazi.org/id/D18CCF00-B59C-4826-9750-E0991FFD871E
taxon LSID	lsid:zoobank.org:act:D18CCF00-B59C-4826-9750-E0991FFD871E
treatment provided by	Felipe
scientific name	Zyras (Zyras) truncatus
status	sp. nov.

Treatment

Zyras (Zyras) truncatus View in CoL spec. nov.

urn:lsid:zoobank.org:act:D18CCF00-B59C-4826-9750-E0991FFD871E

( Figs 11 View Figs 1–41 , 52 View Figs 42–54 , 91 View Figs 82–99 , 150–155 View Figs 134–155 , Map 3 View Map 3 )

Type material: Holotype ♂: “ NEPAL Himalaya, Dhawalagiri, 2004, Region Parbat / Chitre , 2500 m, 25.05.2004, leg. A. Kleeberg / Holotypus ♂ Zyras truncatus sp. n., det. V. Assing 2016” (cAss) . Paratypes: 1 ♂: “ NEPAL Himalaya, Dhawalagiri, 2004, Region Parbat / near Chitre , Ghar Khola valley , ~ 2400 m, 24.05.2004, leg. A. Kleeberg ” (cKle); 1 ♀: “ NEPAL Himalaya, Dhawalagiri, 2004, Region Parbat / near Chitre, 2.4–2.600 m [sic], 27.05.200 [sic], leave [sic] litter, leg. A. Kleeberg ” (cKle) .

Etymology: The specific epithet (Latin, adjective) alludes to the apically truncate male sternite VIII.

Description: Body length 5.6–6.3 mm; length of forebody 2.5–2.8 mm. Coloration ( Figs 11 View Figs 1–41 , 52 View Figs 42–54 , 91 View Figs 82–99 ): head black; pronotum blackish-brown to black; elytra blackish with the humeral portion reddish-yellow and the suture narrowly dark-reddish; abdomen with segments II–V brown, segments VI–VII blackish (except for the partly brown margins), and segments VIII–X dark-brown to blackish-brown; legs dark-yellowish to yellowish-brown; antennae dark-brown with antennomeres I–II and the base of III yellowish-brown and the apical 1–2 antennomeres more or less distinctly pale-brown; maxillary palpi dark-yellowish with palpomere IV paler yellowish.

Head ( Fig. 52 View Figs 42–54 ) rather weakly transverse, median portion extensively impunctate; punctures in lateral portions very sparse and moderately coarse. Eyes slightly longer than postocular region in dorsal view. Antenna ( Fig. 11 View Figs 1–41 ) approximately 2.4–2.5 mm long and very slender; antennomeres IV–IX oblong, X approximately as broad as long, and XI approximately as long as the combined length of IX and X, or nearly so.

Pronotum ( Fig. 52 View Figs 42–54 ) slender, approximately 1.1 times as broad as long and approximately 1.2 times as broad as head, broadest in anterior half, moderately tapering posteriad; lateral margins sinuate in posterior half in dorsal view; punctation rather coarse and very irregularly distributed, arranged in a cluster behind the middle of lateral surface; antero-lateral and postero-lateral portion of lateral surface impunctate or nearly so; midline broadly impunctate; lateral margins each with four long and erect black setae; pubescence of disc pale, thin, rather short, and more or less depressed.

Elytra ( Fig. 52 View Figs 42–54 ) approximately 0.85 times as long as pronotum; punctation moderately coarse and moderately irregularly distributed, rather dense anteriorly, gradually becoming sparser posteriorly, and sparse to very sparse near posterior margin; disc with moderately long, fine, and depressed pale pubescence. Hind wings fully developed. Metatarsomere I approximately as long as, or slightly shorter than the combined length of II–IV.

Abdomen ( Fig. 91 View Figs 82–99 ) slightly narrower than elytra, with rather deep anterior impressions on tergites III–V; tergite II impunctate; anterior impressions of tergites III–V and anterior portion of tergite VI each with a transverse row of coarse, but weakly delimited pits of non-setiferous punctures; tergite III with a lateral setiferous puncture on either side and with a transverse row of six setiferous punctures near posterior margin; tergites IV–VI with a lateral setiferous puncture on either side and with 8–10 setiferous punctures at or near posterior margins; tergite VII with scattered fine nonsetiferous punctures anteriorly and with two irregular transverse series of few setiferous punctures posteriorly, posterior margin with palisade fringe; tergite VIII ( Figs 152, 154 View Figs 134–155 ) with moderately dense dark setae in posterior third, without sexual dimorphism, posterior margin with distinct concavity.

♂: sternite VIII ( Fig. 153 View Figs 134–155 ) nearly as long as broad, much longer than tergite VIII, strongly tapering posteriorly and with distinctly truncate posterior margin; median lobe of aedeagus ( Figs 150–151 View Figs 134–155 ) 0.70–0.75 mm long; ventral process slender, subapically very slender, and apically very acute in lateral view; paramere approximately 0.85 mm long, apical lobe very long and slender.

♀: sternite VIII ( Fig. 155 View Figs 134–155 ) much shorter and more transverse than in male, posterior margin indistinctly concave in the middle.

Comparative notes: Based on several derived character conditions, particularly the slender body, long and slender antennae, a conspicuously irregular distribution of the pronotal punctation, irregularly punctate elytra, the punctation pattern of the pronotum, a posteriorly strongly tapering male sternite VIII with a distinctly truncate posterior margin, an apically very slender ventral process of the aedeagus, and a conspicuously long apical lobe of the paramere, Z. truncatus is undoubtedly very closely related to Z. glabricollis SCHEERPELTZ, 1965 from Northeast Myanmar and related species ( Z. extensus ASSING, 2016 and Z. rectus ASSING, 2016 , both from Northwest Yunnan, China). It is distinguished from all these species by a more slender pronotum with (more) distinctly sinuate lateral margins in posterior half and additionally as follows: from Z. glabricollis by more extensively blackish elytra and by a longer median lobe of the aedeagus with a less strongly curved ventral process in lateral view; from Z. extensus by denser punctation of the more extensively blackish elytra and by a shorter median lobe of the aedeagus with an apically shorter and less slender ventral process of the aedeagus; from Z. rectus by more slender antennae ( Z. rectus : antennomere IX not oblong), more densely and less irregularly distributed punctation of the elytra, a posteriorly distinctly truncate male sternite VIII, and an aedeagus with an apically more slender ventral process (lateral view) and with a less prominent crista apicalis.

For illustrations of Z. glabricollis , Z. extensus , and Z. rectus see ASSING (2016a).

Distribution and natural history: The specimens were collected in three close localities near Chitre in the Dhaulagiri range, Central Nepal ( Map 3 View Map 3 ), at altitudes between 2400 and approximately 2500 m.