Deleaster taiwanensis Hayashi, 1984

Wang, Lin-Fei & Lü, Liang, 2021, Review of the Chinese species of Deleaster Erichson, 1839 (Coleoptera, Staphylinidae, Oxytelinae) with a mitogenome of Deleaster bactrianus Semenov, 1900, Zootaxa 5027 (3), pp. 301-331 : 309-310

Deleaster taiwanensis Hayashi, 1984 [台,寻ƫ隐翅*]

( Fig. 3 )

Hayashi, 1984: 91 (Type locality: Mt. Lishan, alt. about 2500 m, Nantou Hsien [南投a], Taiwan); Herman, 2001: 1326 (catalogue; distribution); Löbl & Smetana, 2004: 512 (Palaearctic catalogue; distribution); Schülke & Smetana, 2015: 768 ( Deleaster ; Taiwan).

Material examined. CHINA, Taiwan: 1♂, 1♀, Shenmu [›木] (near Fenchiifu [奋起湖]), Chiai Hsien [ƚ义a], 16. VII. 1986, Deleaster taiwanensis Hayashi , “ Cum typo comp.” det. Y. Hayashi, 2013 (IZ-CAS, donated by Y. Hayashi).

Redescription. Body ( Fig. 3A ) thickset, flat, and broad, with sparse golden pubescent; almost dark brown to black in dorsal view. Clypeus, mouthparts, antennae, and legs yellowish brown with reddish. Body length: ♂, 8.0 mm; ♀, 9.1 mm.

Male: Head ( Fig. 3B ) transverse, slightly broader than pronotum, sparsely pubescent and punctate. Clypeus rectangular, with sparse setae, anterior margin broadly rounded. Epistomal suture straight, deeply sulciform, equal to level of anterior margin of supra-antennal ridge. Front with sparse microsculpture. Vertex slightly convex and laterally delimited by U-shaped impression. Occipital suture weakly curved to straight with pit in middle. Temples considerably shorter than eyes. Antennae with antennomeres 3 as long as 1, and both longer than others.

Pronotum ( Fig. 3C ) roughly as long as wide, broadest at near anterior 1/4 and narrowed posteriorly; middle portion of pronotum smoothly elevated and sparsely punctate and microsculptured, surrounded with shallow, broad impression covered with coarse microsculpture; with pair of large punctures present towards anterior margin, and two distinct elevated tubercles near posterior angles; mid-longitudinal suture thin and feeble. Scutellum pubescent on coarse surface, with scutiform depression.

Elytra ( Fig. 3A ) large and wide, covered by short pale pubescence. Legs ( Fig. 3A ) slender, tarsal formula 5-5-5, tarsomeres 1–4 expanded (especially in protarsus) and densely padded with fine hairs. Fifth tarsomere as long as remaining together.

Abdomen coriaceous without puncture. Tergites II–VII without basolateral ridges, with a pair of laterosternites on each segment. Tergite VIII with apical margin straight and pectinate in middle ( Fig. 3D ). Sternite VIII with posterior margin broadly emarginated ( Fig. 3F ). Sternite IX divided ( Fig. 3H ).

Aedeagus ( Fig. 3J–M ) with median lobe oblong in ventral view, parameres clavate, with apex slightly curved but not plump.

Female: similar to male, but slightly larger in size; protarsi not so dilated as male; sternite VIII with posterior margin obtusely angled in middle ( Fig. 3G ); Sternite IX undivided ( Fig. 3I ).

Distribution: China (Taiwan).

Figures

FIGURE 3 Deleaster taiwanensis Hayashi: A, habitus ♂; B, head ♂; C, pronotum ♂; D, tergite VIII ♂; E, tergite VIII ♀; F, sternite VIII ♂; G, sternite VIII ♀; H, abdominal segment IX–X ♂ (ventral view); I, abdominal segment IX–X ♀ (ventral view); J, aedeagus (ventral view); K, aedeagus (dorsal view); L, aedeagus (lateroventral view); M, aedeagus (lateral view). Scales: A = 3 mm; B, C = 1 mm; rest, 0.3 mm.