Schmidtinus annapurnensis Yin & Kurbatov, 2022

Yin, Zi-Wei, Kurbatov, Sergey A. & Ку, A., 2022, Schmidtinus annapurnensis, a new genus and species of Batrisitae from Nepal (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 5169 (1), pp. 79-86 : 81-84

Schmidtinus annapurnensis Yin & Kurbatov , sp. nov.

( Figs 1 , 2 )

Type material. HOLOTYPE: NEPAL: ♂, labeled ‘NEPAL, Annapurna Mts. , Banthanti S of Gorapani, 2300–2400 m NN, 24.–26.V.2004, leg. Schmidt, 28°22,1’N, 83°43,4’ ( SENM).

Diagnosis. Male. Body length approximately 3.2 mm; dorsal surface of body with short, dense pubescence; head and pronotum coarsely punctate, elytra and abdomen less so. Head subquadrate, approximately as wide as pronotum, temple moderately short, roundly angulate at posterolateral angle, vertex lacking sulcus, with relatively small, asetose foveae, lacking mediobasal or lateral carina; antenna moderately elongate, with modified antennomeres 9–11, each of these segments shallowly and broadly concave on ventral surface. Pronotum only with shallow median longitudinal sulcus, lacking additional sulcus, carina, or spine. Discal stria of elytron moderately long, extending posteriorly to approximately half of elytral length, basal half of stria with thin carinate margin. Meso- and metatrochanter with small, blunt ventral spine, protibia dilated and flattened for apical half, mesotibia broadened at apical 1/3, with small, apically curved projection at apex. Aedeagus strongly asymmetric, stout; median lobe with large basal capsule and foramen, ventral stalk broad through length, rounded at apex, dorsal lobe strongly curved, C-shaped. Female. Unknown.

Description. Male. Body ( Fig. 1A ) length 3.16 mm; color reddish-brown, tarsi and mouthparts lighter. Dorsal surface of body covered with relatively dense short pubescence.

Head ( Fig. 1B ) subquadrate, approximately as long as wide, length 0.60 mm, width across eyes 0.66 mm; vertex coarsely punctate, moderately raised at middle, lacking sulcus or carina, vertexal foveae (dorsal tentorial pits) asetose, relatively small; posterolateral angle roundly angulate; frons anteriorly fused with clypeus, weakly impressed between slightly raised antennal tubercles; clypeus with smooth surface and anterior margin weakly carinate; distinct ocular-mandibular carina complete, strongly curved. Venter with rough surface; single gular fovea (posterior tentorial pit) present, thin median carina originating from fovea anteriorly to mouthparts. Compound eyes weakly prominent, composed of approximately 80 small ommatidia. Maxillary palpus ( Fig. 1D ) elongate, palpomere 4 4.2 times as long as wide, vestiture with moderately dense setae. Antenna ( Fig. 1C ) moderately long, length 1.60 mm, antennomeres moniliform, lacking distinct club; antennomere 1 short, thick, subcylindrical, 2 approximately as long as wide, 3–10 each transverse, 9–11 broadly impressed on ventral surfaces, 11 largest, oblique, with tuft of thickened setae at apex.

Pronotum ( Fig. 1B ) slightly wider than long, length 0.64 mm, width 0.72 mm, widest near middle; lateral margin rounded, strongly convergent at apical and basal 1/5; disc slightly convex, coarsely punctate, with shallow median longitudinal sulcus, lacking additional carina or sulcus, lacking antebasal, discal, or marginal spines/tubercles; with small, asetose median and lateral antebasal foveae and small outer and inner pair of basolateral foveae. Prosternum with anterior part as long as coxal part, with small lateral procoxal foveae; hypomeron fused with notum and sternum, lacking ridge; margin of coxal cavity broadly carinate.

Elytra (1E) much wider than long, length 0.93 mm, width 1.20 mm, with granulate punctures; each elytron with three moderately large, asetose basal foveae; shallow discal stria extending posteriorly from outer basal fovea to approximately half of elytral length, with carinate margin for basal half; humerus weakly and roundly prominent.

Mesoventrite with short mesoventral process, with complete marginal stria. Metaventrite fused with mesoventrite, prominent admesally, inclined towards middle; posterior margin markedly projected at middle ( Fig. 1F ), forming large hook-like structure.

Legs moderately elongate; profemur strongly constricted at basal 1/3, protibia ( Fig. 2A ) distinctly explanate at apical half; meso- ( Fig. 1G ) and metatrochanter ( Fig. 1H ) with long ventral tubercle or spine at ventral margin, mesotibia ( Fig. 2B ) expanded at middle, with short row of thickened setae and apically curved protuberance at apex.

Abdomen ( Fig. 2C ) widest at lateral margins of tergite 1 (IV), length 0.99 mm, width 1.20 mm. Tergite 1 (IV) approximately 1.2 times as long as 2 (V), discal carina short, triangular, marginal carinae faint, incomplete; 2 slightly longer than 3 (VI), each with short, indistinct lateral carina; 4 (VII) as long as 3 at middle, with complete thin marginal carina; 5 (VIII) transverse, posterior margin roundly emarginate at middle, with pair of small lateral foveae. Sternite 2–5 (IV–VII) successively shorter at middle; 6 (VIII) transverse, posterior margin slightly convex at middle; 7 (IX) ( Fig. 2D ) elongate, tuberculate, round at apex.

Aedeagus ( Fig. 2E, F ) 0.55 mm long, dorso-ventrally asymmetric, stout; median lobe with broad basal capsule and large foramen, lacking basoventral projection, ventral stalk in ventral view broad, with round apex; dorsal lobe elongate, strongly curved leftwards in dorsal view, apically rounded; parameres absent.

Female. Unknown.

Distribution. Gandaki, Nepal.

Etymology. The specific epithet is an adjective composed of Annapurna (mountain) and Latin suffix - ensis (meaning, ‘of’ or ‘from’), indicating the place of the origin.

Figures

FIGURE 1. Habitus and diagnostic characters of male Schmidtinus annapurnensis gen. et sp. nov. A. Dorsal habitus. B. Head and pronotum. C. Antennal club. D. Maxillary palpus. E. Elytron. F. Posteromedial projection of metaventrite. G. Mesotrochanter. H. Metatrochanter. Scale bars: 1.0 mm in A; 0.3 mm in B, E; 0.2 mm in C; 0.1 mm in D, F–H.

FIGURE 2. Diagnostic characters of male Schmidtinus annapurnensis gen. et sp. nov. A. Protibia. B. Mesotibia. C. Tergites. D. Sternite 7 (IX). E, F. Aedeagus, in dorsal (E) and ventral (F) view. Scale bars: 0.2 mm in A, B, E, F; 0.3 mm in C; 0.1 mm in D.