Asiageodromicus dawai Yang & Peng, 2025

Yang, Yi, Danzeng, Nima & Peng, Zhong, 2025, Two new species and additional records of the genus Asiageodromicus Shavrin, 2024 from Xizang, southwest China (Coleoptera, Staphylinidae, Omaliinae), ZooKeys 1241, pp. 83-91 : 83-91

Asiageodromicus dawai Yang & Peng sp. nov.

Figs 1 A , 2 , 4–6

Type material.

Holotype. China – Xizang Prov. • ♂; glued on a card with two labels as follows: “ China: Xizang Prov., Langkazi Co., Puma Yumco , 28°37'17"N, 90°27'01"E, 5000 m, 02.VII.2021, Z. Peng, Z. Yin & W. Zhang leg. ” “ HOLOTYPE: Asiageodromicus dawai sp. nov., Yang & Peng des. 2025 ” [red handwritten label]; SNUC . Paratypes. China – Xizang Prov. • 6 ♂♂, 37 ♀♀; glued on the cards, each card with two labels as follows: “ China: Xizang Prov., Langkazi Co., Puma Yumco , 28°37'17"N, 90°27'01"E, 5000 m, 02.VII.2021, Z. Peng, Z. Yin & W. Zhang leg; ” “ PARATYPE: Asiageodromicus dawai sp. nov., Yang & Peng des. 2025 ” [yellow printed label]; SNUC .

Description.

Measurements (in mm) and ratios: BL: 5.17–6.22; FL: 3.84–4.09; HW: 0.89–1.07; HL: 0.52–0.65; OL: 0.22–0.33; LT: 0.09–0.15; AL: 2.61–3.13; PL: 0.74–0.91; PWmax: 1.20–1.33; PWmin: 1.04–1.22; ESL: 1.39–1.70; EW: 1.87–2.12; MTbL: 0.99–1.11; MTrL: 0.30–0.43; AW: 1.80–2.10; AedL: 1.23–1.27.

Habitus as in Fig. 1 A . Body blackish-brown, with paler, reddish-brown elytra and apical abdominal tergites; legs brown; mouthparts, antennae, and tarsi light brown. Head with fine microsculpture; neck with distinct large isodiametric sculpture; pronotum with distinct isodiametric microreticulation; elytra and scutellum without microsculpture; abdominal tergites with dense and distinct isodiametric microsculpture.

Head transverse, convex between anteromedian depression and in portions between ocelli and eyes; frontal portion with relatively deep and wide anteromedian depression, distinctly narrowed basad to level of anterior margins of eyes; interocellar depression moderately deep, slightly narrowing basad, separated from infraorbital ridges by fine and long convergent grooves in front of ocelli; temples convex, less than half as long as eyes. Eyes moderately large, strongly convex. Ocelli small, distance between ocelli about 1.3–2.0 times as long as distance between ocellus and posterior margin of eye. Punctation irregular and fine, indistinct in apical portion, more distinct and denser on infraorbital ridges. Neck with indistinct and irregular fine punctures. Preapical segment of maxillary palp about 0.8 times as long as preceding segment, markedly widened apicad; apical palpomere about 0.7 times as long as preapical segment, widest in basal portion, gradually narrowing apically. Antennae moderately long, exceeding apical third of elytra when reclined; lengths × widths of antennomeres (holotype): 1: 0.26 × 0.11; 2: 0.17 × 0.09; 3: 0.26 × 0.09; 4: 0.24 × 0.07; 5: 0.24 × 0.09; 6–7: 0.54 × 0.11; 8–9: 0.52 × 0.14; 10: 0.24 × 0.13; 11: 0.35 × 0.09.

Pronotum slightly convex, transverse, widest in anterior third, narrower posteriad than anteriad, with anterior angles rounded and indistinctly protruding; narrow basal part of pronotum with straight lateral margins and with obtuse posterior angles; median portion without impressions. Punctation dense, markedly larger, deeper, and coarser than that in head, finer and sparser in middle.

Elytra slightly convex, slightly wider than long, widened posteriad. Punctation as that in pronotum or slightly shallower, markedly finer and denser on prescutellar portion. Scutellum with fine, irregular punctures.

Abdomen slightly broader or about as wide as elytra, convex, with two large, transverse tomentose spots in the middle of tergite IV. Punctation distinct, very dense and fine.

Male. Protarsomeres 1–4 markedly wide. Apical margin of abdominal tergite VIII (Fig. 2 C ) nearly truncate; apical margin of abdominal sternite VIII (Fig. 2 D ) broadly concave. Aedeagus (Fig. 2 E – G ) with small basal portion rotated inside abdomen in lateral position (90 °, when viewed dorsally); long median lobe, gradually narrowed toward apex; parameres narrow, slightly curved in apical portion, extending beyond apex of median lobe, each bearing two long and two short apical setae; internal sac weakly sclerotized, with very long flagellum coiled in basal part of aedeagus.

Female. Protarsomeres 1–4 narrow. Apical margins of abdominal tergite VIII and sternite VIII truncate.

Distribution and biological notes.

The type locality is situated to the south of Langkazi, southern Xizang. The specimens were collected at an elevation of 5000 m by sifting mixed leaf litter and sand or from under stones near Pumuyongcuo Lake (Figs 4–6 ).

Etymology.

This species is dedicated to Mr Dawa, who supported us on our field trips.

Comparative notes.

Based on the similar external and sexual characters, particularly the similar structure of the aedeagus, A. dawai is most similar to A. amplissimus Shavrin, 2019 . Externally, A. dawai differs from A. amplissimus by the somewhat smaller body size, shorter antenna and elytra, with less dense punctation of pronotum and smaller tomentose spots in the middle of tergite IV. For illustrations of A. amplissimus see Shavrin (2019: figs 2, 8–9).

Figures

Figure 1. Habitus A Asiageodromicus dawai sp. nov. B Asiageodromicus zhangi sp. nov. Scale bars: 1.0 mm.

Figure 2. Asiageodromicus dawai sp. nov. A female tergite VIII B female sternite VIII C tergite VIII D male sternite VIII E aedeagus in ventral view F aedeagus in lateral view G aedeagus in dorsal view. Scale bars: 0.2 mm.

Figures 4–7. Collection and habitat of Asiageodromicus zhangi sp. nov. 4 habitat of A. dawai (Pumuyongcuo Lake) 5 Wen-Xuan Zhang (right) and Zhong Peng (left) collecting A. dawai 6 A. dawai was found walking under the stone 7 habitat of A. zhangi (Lebu Valley).