Asiageodromicus zhangi 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 zhangi Yang & Peng sp. nov.

Figs 1 B , 3 , 7

Type material.

Holotype. China – Xizang Prov. • ♂; glued on a card with two labels as follows: “ China: Xizang Prov., Cuona County, Lebu Valley , 27°55'13"N, 91°51'16"E, 3650–4050 m, 05.VII.2021, Peng, Yin & Zhang leg. ” “ HOLOTYPE: Asiageodromicus zhangi sp. nov., Yang & Peng des. 2025 ” [red handwritten label]; SNUC . Paratypes. China – Xizang Prov. • 3 ♂♂, 3 ♀♀; glued on the cards, each card with two labels as follows: “ China: Xizang Prov., Cuona County, Lebu Valley , alt. 27°55'13"N, 91°51'16"E, 3650–4050 m, 05.VII.2021, Peng, Yin & Zhang leg; ” “ PARATYPE: Asiageodromicus zhangi sp. nov., Yang & Peng des. 2025 ” [yellow printed label]; SNUC .

Description.

Measurements (in mm) and ratios: BL: 5.55–7.10; FL: 4.03–4.54; HW: 1.13–1.20; HL: 0.63–0.73; OL: 0.23–0.30; LT: 0.13–0.18; AL: 3.30–3.55; PL: 0.95–1.05; PWmax: 1.43–1.58; PWmin: 1.23–1.40; ESL: 1.45–1.70; EW: 2.13–2.38; MTbL: 1.23–1.28; MTrL: 0.28–0.38; AW: 2.15–2.50; AedL: 1.35–1.37.

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

Head transverse, convex between anteromedian depression and in portions between ocelli and eyes; frontal portion with slightly elevated supra-antennal protuberance, with two relatively deep and round median depression, distinctly narrowed basad to level of anterior margins of eyes; interocellar depression relatively deep, unseparated, slightly narrowing basad; temples convex, less than half as long as eyes. Eyes moderately large, strongly convex. Ocelli small, distance between ocelli about 1.1–1.6 times as long as distance between ocellus and posterior margin of eye. Punctation irregular and fine, distinct in apical portion. Neck with indistinct and regular fine punctures. Preapical segment of maxillary palp about 0.9 times as long as preceding segment, markedly widened apicad; apical palpomere about 0.8 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: 0.35 × 0.15; 2: 0.28 × 0.10; 3: 0.28 × 0.10; 4: 0.30 × 0.10; 5: 0.28 × 0.10; 6–7: 0.60 × 0.13; 8–9: 0.63 × 0.10; 10: 0.28 × 0.16; 11: 0.45 × 0.16.

Pronotum slightly convex, transverse, widest in anterior twice, 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 smaller, shallow, and coarser than that in head, finer and sparser in middle.

Elytra slightly convex, slightly wider than long, slightly widened posteriad. Punctation markedly deeper, coarser and denser on prescutellar portion. Scutellum with fine, irregular punctures.

Abdomen broader than elytra, convex, with two medium-sized, transverse tomentose spots in the middle of tergite IV. Punctation distinct, very dense and fine.

Male. Protarsomeres 1–4 markedly wide. Apical margins of abdominal tergite VIII (Fig. 3 C ) weakly concave; apical margins of abdominal sternite VIII (Fig. 3 D ) broadly concave. Aedeagus (Fig. 3 E – G ) with moderately large basal portion; relatively wide and long median lobe, gradually narrowed toward apex; parameres narrow, curved in apical portion, almost reaching apex of median lobe, each bearing three long and one short apical setae; internal sac sclerotized, with very long flagellum coiled in basal part of aedeagus.

Female. Protarsomeres 1–4 narrow. Apical margins of abdominal tergite VIII truncate; Apical margins of abdominal sternite VIII slightly convex.

Distribution and biological notes.

The type locality is situated to the southwest of Cuona, southern Xizang. The specimens were collected at elevations from 3650 to 4050 m by sifting moss and litter near banks of streams (Fig. 7 ).

Etymology.

The species is dedicated to Mr Wen-Xuan Zhang, who is one of the collectors of the type specimens.

Comparative notes.

Based on the similarly derived morphology of the aedeagus (relatively wide and long median lobe, narrow and very long flagellum in internal sac), as well as the similar shape of the male tergite VIII, A. zhangi is most similar to A. subquadratus ( Cheng, Shavrin & Peng, 2020) . Externally, A. zhangi differs from A. subquadratus by shorter elytra, unseparated interocellar depression, smaller tomentose spots in the middle of tergite IV, with no spots on tergite V, and by the posteriorly more broadly concave male sternite VIII. For illustrations of A. zhangi see Figs 1 B , 3 and for A. subquadratus see Cheng et al. (2020: figs 95, 97–101).

Figures

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

Figure 3. Asiageodromicus zhangi 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).