Platystethus erlangshanus Yan, Li & Zheng, 2012

Lü, Liang & Zhou, Hong-Zhang, 2015, Review of the Genus Platystethus Mannerheim (Coleoptera: Staphylinidae: Oxytelinae) in China, Zootaxa 3915 (2), pp. 151-205 : 176-178

publication ID

https://doi.org/ 10.11646/zootaxa.3915.2.1

publication LSID

lsid:zoobank.org:pub:BEAD42C0-1031-4C82-A71A-15A670C3467A

DOI

https://doi.org/10.5281/zenodo.6114340

persistent identifier

https://treatment.plazi.org/id/03CE8795-FFCB-A45D-FF11-A1D0FE31FB20

treatment provided by

Plazi

scientific name

Platystethus erlangshanus Yan, Li & Zheng, 2012
status

 

6. Platystethus erlangshanus Yan, Li & Zheng, 2012 View in CoL

( Figs. 14 View FIGURE 14 & 15 View FIGURE 15 )

Yan, Li & Zheng, 2012: 341, 342 (Type locality: Sichuan, Tianquan County ([Mt. Erlang], 29º49' – 30º13' N, 102ºl7' – 102º37' E; alt. 2800 m), cow dung).

Material examined. 5 specimens, 4♂♂, 1♀♀. CHINA: Sichuan: 1♂, Baoxing, Guobayan [30.64ºN 102.83ºE], 3340 m, alpine meadow, pitfall trap, 2001. VII.1–4, X.-D. Yu & H.-Z. Zhou legg. (IZ-CAS); 1♀, same data as previous except: 3270 m, Abies forest (IZ-CAS); 1♂, Baoxing, Mahuanggou [30.81ºN 102.73ºE], 2681m, pitfall trap, 2012. VI.29, H.-L. Shi & Y. Liu legg. (IZ-CAS); 1♂, Ganzi [=Garze], Moxizhen [=Moxi Township], Changheba [30.26ºN 102.19ºE], sifting, 2009. V.19, Y.-L. Zhou leg. (IZ-CAS); 1♂, Wolong, Mt. Balang [30.90ºN 102.92ºE], 3700m, alpine meadow, pitfall trap, 2004. VII.5–8, X.-D. Yu leg. (IZ-CAS).

Redescription. Body black; mandibles, maxillary palpi, apical 4 antennomeres reddish brown; elytra and legs light brown to yellow, darker in margins. Length [average]: ♂, 4.5 mm; ♀, 4.2 mm.

Male. Head ( Figs. 14 View FIGURE 14 A; 15A) broadest at temples. Disc nearly glabrous, with punctures dense and coarse. Clypeus transverse, with anterior margin slightly emarginate, in middle furnished with short sharp process, bordered with membrane at each side. Epistomal suture with middle portion absent, lateral portions short and obscure and posteromedially directed. Supra-antennal ridges obviously elevated. Vertex depressed weakly coriaceous, glabrous, barely punctate in anterior part, convex and strongly punctate at each side of mid-longitudinal suture; mid-longitudinal suture short and deep, posteriorly reaching occipital suture. Eyes slightly convex, shorter than temples, with fine facets; orbital sulcus fine. Temple dilated laterally. Occipital suture deep and arciform, with large setal fovea at each end. Mandible ( Fig. 15 View FIGURE 15 C) stout, and dull and incurved at apex; bearing 3 reduced teeth on inner edge: 2 large with 1 tiny in between; with tiny spur situated in fovea at middle of dorsal surface.

Pronotum ( Figs. 14 View FIGURE 14 A; 15A) as wide as head or narrower, widest at anterior 1/3, with mid-longitudinal sulcus throughout, with punctures sparser and smaller than in head, without micro-striae; anterior margin bi-emarginate, anterior lateral angles produced, no posterior angles; lateral and posterior margins integrated and evenly rounded, with marginal bead broad, without crenulation. Scutellar impression heart-shaped, anterior margins crescent. Elytra ( Fig. 15 View FIGURE 15 A) with posterior margin obliquely truncate, elytral suture dehiscent.

Abdomen weakly coriaceous. Sternite VII ( Figs. 14 View FIGURE 14 C; 15E) with posterior margin prominently and rectangularly protruding in middle. Sternite VIII ( Figs. 14 View FIGURE 14 D; 15F) tri-partitioned by 2 curved narrow sutures, middle part with posterior margin a little curved and with mid-longitudinal internal ridge at anterior 2/3, lateral parts completely separated by middle part, each at mesial side with long process (longer than that in P. arenarius but shorter than in P. burcerus ) situated with short seta at apex; basal ridge interrupted in middle, sub-basal ridge with middle portion absent.

Aedeagus ( Figs. 14 View FIGURE 14 G–I; 15I –L) with median lobe bottle-like, inflated at base; apical orifice large and broadly fissured to middle of ventral surface, embedded with sharp triangular sclerite there, edges of ventral fissure dully protruding, incrassated, and sparsely pubescent; internal sac membranous. Paramere arm-like, basal arm with furrow on ventral surface; apical arm furnished with two slender setae: one at apex, the other nearing apical 1/3, with pits scattered along ventral edge.

Female. Head ( Figs. 14 View FIGURE 14 B; 15B) smaller, narrower than pronotum; clypeus longer, slightly protruding in middle of anterior margin which entirely beyond supra-antennal ridges; epistomal suture with lateral portion longer and obvious; vertex slightly convex at side of mid-longitudinal suture; eyes convex, nearly equal to temples in length, temples not dilated. Mandibles ( Fig. 15 View FIGURE 15 D) shorter than in male, with teeth more prominent. Pronotal anterior margin ( Figs. 14 View FIGURE 14 B; 15B) with bi-emargination weaker. Abdominal sternite VII with posterior margin straight. Sternite VIII ( Figs. 14 View FIGURE 14 E; 15G) not partitioned, without processes, with posterior margin broadly rounded and a little protruding in middle.

Spermatheca ( Figs. 14 View FIGURE 14 F; 15H) clavate, with basal part inflated into globoid and apical part slender and reversely hooked at apex.

Distribution. Sichuan.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

SubFamily

Oxytelinae

Genus

Platystethus

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