Atheta (Microdota) silvatica Bernhauer, 1907

Lee, Seung-Gyu & Ahn, Kee-Jeong, 2015, A taxonomic review of Korean species of the AthetaThomsonsubgenusMicrodota Mulsant & Rey, with descriptions of two new species (Coleoptera, Staphylinidae, Aleocharinae), ZooKeys 502, pp. 61-97 : 76-77

Taxon classification Animalia Coleoptera Staphylinidae

Atheta (Microdota) silvatica Bernhauer, 1907 Fig. 11

Atheta (Microdota) silvatica Bernhauer, 1907: 405.

Atheta (Amidobia?) silvatica : Sawada 1974: 184 (as valid species).

Atheta (Microdota) silvatica : Paśnik 2001: 209; Smetana 2004: 388 (as valid species).

Material examined.

Syntype, 1♂, labeled as follows: 'Japan. Sauter Negishi, 25. 2. 05, silvatica bernh typ. det Bernhauer, silvatica Bernh. Typus, Chicago NHMus M.Bernhauer Collection’. NORTH KOREA: 1 ex., Korea 12.6.1974 Vaudo ad Nampo Exp. Inst.Zool.Cr. [North Korea, Pyeongannam Prov., Nampo-si, Waudo, 12.vi.1974, ISEA].

Description.

Length about 1.5-2.0 mm. Body (Fig. 11) slender and parallel-sided, more or less flattened; surface distinctly glossy and densely pubescent, with fine microsculpture. Body usually reddish brown; head slightly darker than pronotum and elytra; legs yellowish brown. Head. Subquadrate, approximately 1.0-1.1 times wider than long, widest across eyes, slightly narrower than pronotum; eyes small, about 0.8 times longer than tempora; infraorbital carina complete; gular sutures moderately separated, diverged basally. Antennae dilated apically, longer than head and pronotum combined; antennomeres 1-3 elongate, 1 longest, 4 about as long as wide, 5-10 distinctly transverse, 11 longer than wide, about as long as preceding two combined. Thorax. Pronotum transverse, approximately 1.3-1.4 times wider than long, widest at apical third; pubescence directed anteriorly in midline. Elytra slightly transverse, slightly wider than pronotum, elytron approximately 1.7-1.8 times longer than wide, pubescence directed posteriorly and postero-laterally; postero-lateral margin almost straight; hind wings fully developed. Legs. Slender and long, with dense pubescence and setae; tibiae with two spurs at apex; meso- and metatarsomeres 1-4 subequal in length. Abdomen. Parallel-sided, widest at middle; surface distinctly glossy and densely pubescent; male tergite VIII with 4 macrosetae on each side of midline, posterior margin emarginated at middle; male sternite VIII with 8 macrosetae on each side of midline, posterior margin broadly rounded. Genitalia. Median lobe oval, apical process slightly decurved at apex in lateral aspect.

Distribution.

Korea (North) and Japan.

Remarks.

This species was recorded by Paśnik (2001) in North Korea and a dissected specimen was unavailable. Accordingly, we could not describe the mouthparts and aedeagus in detail. This species is distinguished from similar species by the characters provided in Sawada (1974).