Schmidtinus 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 : 80-81

Schmidtinus Yin & Kurbatov , gen. nov.

( Figs 1 , 2 )

Type species. Schmidtinus annapurnensis sp. nov.

Diagnosis. Head subquadrate; lacking distinct frontal rostrum, with short setose tuft at posterior corners; maxillary palpomere 4 more than four times as long as wide; antennomeres moniliform. Pronotum rounded laterally, broadest near middle, with median longitudinal sulcus, small median and lateral antebasal foveae, and two pairs of basolateral foveae. Elytra with three distinct basal foveae, with shallow discal stria, lacking subhumeral fovea or marginal stria. Abdomen roundly narrowing posteriorly, with tergite 1 (IV) longer than 2 (V) but shorter than 2–3 (V–VI) combined, marginal carina of tergite 1 indistinct. Aedeagus stout, with broad median lobe and curved dorsal one.

Description. Habitus ( Fig. 1A ) moderately stout. Head ( Fig. 1B ) subquadrate; lacking distinct frontal rostrum, antennal tubercles indistinct; vertexal foveae (dorsal tentorial pits) small, asetose, lacking sulcus connecting them; posterior corner rounded, with tuft of short, thickened setae; posterior margin sinuate; eyes small, ocular-mandibular carina complete, distinct, and strongly curved; ocular canthus short, roundly angulate. Venter with single gular fovea and thin median carina; antenna 11-segmented, moderately elongate, extending to elytral base when extended posteriorly, antennomeres moniliform, lacking distinct club; maxillary palpus ( Fig. 1D ) with small palpomere 1, 2 lengthily pedunculate basally and broad at apex, 3 subquadrate, elongate, 4 fusiform, more than four times as long as wide, with short apical cone at apex.

Pronotum ( Fig. 1B ) slightly wider than long, lateral margins rounded at middle, strongly convergent at apical and basal 1/5, anterior margin slightly emarginate, posterior margin broadly and slightly curved; small median and lateral antebasal foveae and two pairs of basolateral foveae present, lacking marginal, discal or antebasal spines/tubercles, with shallow median longitudinal sulcus, lacking transverse antebasal sulcus; hypomeron laterally fused with pronotum and prosternum; prosternum with small lateral procoxal foveae, anterior part with short median and pair of lateral ridges, and small admesal trichome.

Elytra truncate at bases, each elytron ( Fig. 1E ) with three distinct basal foveae, with small subbasal fovea, discal stria extending posteriorly to half of elytral length, sutural stria complete, humeral angel slightly prominent, lacking subhumeral fovea or marginal sulcus.

Mesoventrite lacking median fovea, lateral mesoventral foveae unforked (straight) internally. Metaventrite fused with mesoventrite, with small, asetose lateral coxal foveae, lateral metaventral foveae moderately separated; coxae moderately separated.

Abdomen ( Fig. 1A , 2C ) broadest at base, narrowing posteriorly and with round apex. Tergite 1 (IV) longer than 2 (V) but shorter than 2 and 3 (VI) combined, basally sulcate, with tiny mediobasal and one pair of small basolateral foveae, with short discal and indistinct marginal carina; 2 and 3 successively shorter, lacking fovea; 4 (VII) as long as 3 at middle, with pair of small basolateral foveae. Sternite 2 (IV) with one pair of small mediobasal and two pairs of small basolateral foveae; 3 (V) slightly longer than 4 (VI), 3 and 4 each with two pairs of tiny basolateral foveae; 5 (VII) shorter than 4 at middle, lacking fovea.

Legs moderately elongate, tarsomeres 2 and 3 subequal in length, with one major and one setiform claw.

Males have antennomeres 9–11, metaventrite and legs modified; aedeagus ( Fig. 2E, F ) asymmetric, stout, with large basal foramen, median lobe with broad capsule, dorsal lobe elongate and curved.

Etymology. The genus-group name is an adjective combined from Joachim Schmidt (German entomologist, specialist on Carabidae ), who collected both specimens of this work, and Latin suffix - inus, meaning, ‘of’ or ‘pertaining to’. The gender is masculine.

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.