Sinlathrobium iniquum, Assing, 2013

Assing, Volker, 2013, Two new genera of Lathrobiina from the East Palaearctic region (Coleoptera: Staphylinidae: Paederinae), Beiträge Zur Entomologie = Contributions to Entomology 63 (2), pp. 219-239 : 236-238

publication ID	https://doi.org/ 10.21248/contrib.entomol.63.2.219-239
persistent identifier	https://treatment.plazi.org/id/038EE37E-FC54-FFAA-FF65-6BA4FD6E6AAB
treatment provided by	Carolina
scientific name	Sinlathrobium iniquum
status	sp. nov.

Treatment

Sinlathrobium iniquum View in CoL sp. n.

( Figs 72-79 View Figs 72-80 )

Type material:

Holotype : “CHINA-YUNNAN, Yanmen, 13.6.- 23.6.2005, lgt. E. Kučera / Holotypus  Sinlathrobium iniquum sp. n., det. V. Assing 2013” (cAss).

Etymology:

The specific epithet (Latin, adjective: uneven) alludes to presence of impressions and elevations on the head and the elytra.

Description:

Body length 8.0 mm; length of forebody 4.4 mm. Habitus as in Fig. 72 View Figs 72-80 . Coloration: body black, elytra with rather extensive orange spot in postero-lateral angles, this spot reaching posterior and lateral margins, but not suture; legs with the femora blackish, the tibiae blackish-brown, and the tarsi reddish; antennae dark-brown.

Head ( Fig. 73 View Figs 72-80 ) 1.15 times as broad as long, broadest across eyes; lateral margins behind eyes very weakly converging, nearly parallel in dorsal view; dorsal surface uneven, vertex with smooth median elevation, between eyes with two impressions near dorsal margins of eyes, frons with three small impressions; punctation coarse, dense in lateral and posterior portions of dorsal surface; median dorsal portion and frons with impunctate or more sparsely punctate areas; interstices without microsculpture and glossy. Eyes strongly bulging, approximately 0.8 times as long as postocular region from posterior margin of eye to neck in dorsal view. Antenna ( Fig. 74 View Figs 72-80 ) 2.2 mm long; antennomeres IV-V weakly oblong, VI-X as broad as long.

Pronotum ( Fig. 73 View Figs 72-80 ) weakly oblong, 1.08 times as long as broad and 0.98 times as broad as head, distinctly convex in

cross-section, broadest anteriorly; lateral margins convex in dorsal view; punctation coarse and moderately dense; interstices glossy, without microsculpture; impunctate midline confined to posterior third of pronotum.

Elytra ( Fig. 73 View Figs 72-80 ) 0.97 times as long as pronotum; punctation moderately dense, coarse, but shallow, partly weakly defined; disc uneven, with shallow, slightly diagonal longitudinal depressions. Metatibia 1.2 mm long.

Abdomen slightly narrower than elytra; punctation distinct and moderately dense, slightly sparser on tergites VII-VIII than on tergites III-VI; posterior margin of tergite VII with palisade fringe.

: sternites III-VI with shallow median impressions; sternite VII ( Fig. 75 View Figs 72-80 ) strongly transverse, 1.8 times as broad as long, with distinct postero-median impression, this impression without setae in the middle and posteriorly; postero-lateral portions with unmodified and not particularly dense dark setae, posterior margin weakly concave; sternite VIII ( Fig. 76 View Figs 72-80 ) transverse and with postero-median impression, postero-median portion without setae, posterior excision moderately deep; aedeagus ( Figs 78-79 View Figs 72-80 ) 1.4 mm long and symmetric; ventral process in the middle conspicuously sculptured, apically acute in ventral view; dorsal plate reduced, weakly sclerotized, lamellate, apical portion small, basal portion minute; internal sac with membranous structure.

: unknown.

Comparative notes:

Sinlathrobium iniquum differs from all its congeners by the short and broad pronotum, the glossy elevations on the head, the uneven surface of the elytra, the shape and

Key to the species of Sinlathrobium 1. Femora blackish; tibiae blackish-brown. .......................................................................................................................... 2

Femora reddish-brown to brown; tibiae reddish. ........................................................................................................... 3 2. Median dorsal portion of head densely punctate and nearly matt, without distinct elevations and with a small median impression ( Fig. 59 View Figs 58-71 ). Antennomeres VI-X noticeably oblong ( Fig. 60 View Figs 58-71 ). Elytra glossy and with smooth surface, with fine and moderately dense punctation ( Fig. 59 View Figs 58-71 ). Abdomen, except for the anterior portions of tergites III and IV, with very dense and fine punctation. Male sternite VII strongly transverse, 2.0 times as broad as long, posteriorly with a pair of transverse clusters of numerous stout black setae ( Fig. 61 View Figs 58-71 ). Male sternite VIII with shallow posterior excision ( Fig. 62 View Figs 58-71 ). Aedeagus ( Figs 64-65 View Figs 58-71 ) 1.1 mm long, with broad, short, and apically convex ventral process in ventral view; ventral process not conspicuously sculptured in the middle. China: western Sichuan. ........................ ........................................................................................................................................................... densepunctatum sp. n.

Median dorsal portion of head with moderately dense punctation and glossy, with rather large median elevation and with pair of lateral impressions ( Fig. 73 View Figs 72-80 ). Antennomeres VI-X not oblong, at least as broad as long ( Fig. 74 View Figs 72-80 ). Elytra with subdued shine and with shallow longitudinal impressions ( Fig. 73 View Figs 72-80 ). Abdomen with less fine and less dense punctation. Male sternite VII approximately 1.8 times as broad as long and without conspicuous clusters of black setae posteriorly ( Fig. 75 View Figs 72-80 ). Male sternite VIII with deeper posterior excision ( Fig. 76 View Figs 72-80 ). Aedeagus ( Figs 78-79 View Figs 72-80 ) 1.4 mm long, with more slender and apically acute ventral process in ventral view; ventral process conspicuously sculptured in the middle. China: northwestern Yunnan. ....................................................................... iniquum sp. n. 3. Forebody with coarser and on pronotum denser punctation; interstices on pronotum distinctly narrower than diameter of punctures, except for the posterior rudiment of an impunctate median band ( ASSING 2012a: figure 322); abdomen with coarser punctation. Male sternites IV-VI with median impressions. Male sternite VII with weakly defined pair of clusters of black setae posteriorly ( ASSING 2012a: figure 323). Aedeagus apically acute in ventral view and more slender in lateral view ( ASSING 2012a: figures 325-326). China: Yunnan: Gaoligong Shan. ............. ............................................................................................................................................... lobrathiforme (ASSING, 2012)

Forebody with less coarse and on pronotum sparser punctation; interstices on pronotum on average broader than diameter of punctures ( ASSING 2012a: figure 316); abdomen with finer punctation. Male sternites IV-VI without median impressions. Male sternite VII without clusters of black setae ( ASSING 2012a: figure 317). Aedeagus apically convex in ventral view and stouter in lateral view ( ASSING 2012a: figures 319-320). China: Chonqing: Jinfo Shan. ... ........................................................................................................................................................ lobrathioides (ASSING, 2012)

chaetotaxy of the male sternite VII, and the morphology of the aedeagus.

Distribution and natural history:

The type locality is situated in northwestern Yunnan, near the Mekong river, at approximately 28°03'N, 98°53'E ( Map 2 View Map 2 ). It is located 46 km to the northeast of the type locality of S. lobrathiforme in the Nu Shan. The type localities of both species are separated by the Salween river valley. Additional data are not available GoogleMaps .