Atheta (Microdota) kawachiensis Sawada, 1974

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 : 70

Taxon classification Animalia Coleoptera Staphylinidae

Atheta (Microdota) kawachiensis Sawada, 1974 Figs 6, 30, 39, 48, 57, 66, 75

Atheta (Amidobia) kawachiensis Sawada, 1974: 158.

Atheta (Microdota) kawachiensis : Smetana 2004: 386 (as valid species).

Material examined.

SOUTH KOREA: Gangwon Prov.: 32 exx., Sokcho-si, Mt. Seoraksan, Hwaamsa, 21.vi.2002, JS Park, sifting.

Description.

Length 1.6-2.0 mm. Body (Fig. 6) slender and parallel-sided, more or less flattened dorso-ventrally; surface glossy, densely pubescent, with fine microsculpture. Body usually reddish brown to dark brown; head and abdomen dark brown to black; pronotum slightly darker than elytra; legs yellowish brown. Head. Subquadrate, approximately 1.0-1.1 times wider than long, widest across eyes, slightly narrower than pronotum; eyes moderate in size and prominent, about 1.0-1.2 times longer than tempora; gular sutures moderately separated, diverged basally; infraorbital carina complete; cervical carina complete. Antennae (Fig. 30) dilated apically; antennomeres 1-3 elongate, 1 longest, 4-10 slightly transverse to transverse, 11 longer than wide, about as long as preceding two combined. Mouthparts. Labrum transverse, anterior margin emarginate; two lateral sensilla and about 8 macrosetae present on each side of midline, α-sensillum setaceous, slightly longer than ε-sensillum, β- and γ-sensilla reduced. Mandibles asymmetrical, pointed apically, about 1.6-1.7 times as long as basal width; anterior margin serrulate; right one with small internal tooth; prostheca developed. Lacinia of maxilla with seven spines in distal comb, two isolated spines present; maxillary palpus elongate, with pubescence and long setae; palpomere 1 smallest and about 1.6-1.8 times as long as wide, 2 about 2.5-2.7 times longer than wide, 3 longer than 2, about 2.4-2.5 times as long as wide, 4 digitiform, filamentous sensilla reaching to basal half. Labium with ligula divided into two lobes in basal half; two medial setae narrowly separated; two basal pores contiguous; lateral pseudopores, one setal pore and two real pores present on prementum; labial palpus elongate, with many setulae; palpomere 1 largest and dilated basally, about 1.3-1.5 times longer than wide, with γ-setula close b-setula, 2 shortest, about 1.2-1.4 times longer than wide, 3 long and slender, about as long as 1, about 3.5-4.0 times longer than wide. Thorax. Pronotum transverse, approximately 1.2 times wider than long, widest at apical third; pubescence directed anteriorly in midline. Metanotal scutum with one long seta and about 1-2 short setae on each side of midline; mesocoxal cavities narrowly separated, mesoventral process pointed at apex, about twice longer than metaventral process. Elytra slightly wider than pronotum; elytron approximately 1.7-1.8 times longer than wide, pubescence directed postero-laterally; postero-lateral margin almost straight; hind wings fully developed; flabellum composited one long setose lobe. Legs. Slender and long, with dense pubescence and setae; tibia with two spurs at apex; length ratio of tarsomeres 16:17:19:49 (protarsus); 20:22:23:23:48 (mesotarsus); 28:28:28:27:60 (metatarsus); one empodial seta present, shorter than claw. Abdomen. Parallel-sided, widest at middle; surface distinctly glossy and densely pubescent, with fine and imbricate microsculpture; macrochaetal arrangement of tergites II–VI 01-02-12-12-13; male tergite VIII (Fig. 39) with 4 macrosetae on each side of midline, posterior margin slightly emarginate; male sternites V–VII with many pores in anterior margin, VIII with 7 macrosetae on each side of midline, posterior margin convex, slightly rounded, with long marginal setae; posterior margin of female tergite VIII similar to male; posterior margin of female sternite VIII slightly emarginate at middle, with long and short marginal setae; minute setae present in median region. Genitalia. Median lobe (Figs 48, 57) oval; apical process triangular, convergent at apex in ventral aspect. Apical lobe of paramerites (Fig. 66) subparallel-sided and elongate with four short setae; a-seta longest, slightly longer than other setae. Spermatheca (Fig. 75) with small umbilicus, duct one coiled apically.

Distribution.

Korea (South) and Japan.

Remarks.

All specimens were collected by sifting leaf litter in Gangwon province.