Atheta (Microdota) spinula (Sawada, 1970)

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 : 79-81

Taxon classification Animalia Coleoptera Staphylinidae

Atheta (Microdota) spinula (Sawada, 1970) Figs 14, 35, 44, 53, 62, 71, 80

Ischnopoda (Hygroecia) spinula Sawada, 1970: 60

Atheta (Amidobia) spinula : Sawada 1974: 175 (as valid species).

Atheta (Microdota) spinula : Smetana 2004: 388 (as valid species).

Material examined.

SOUTH KOREA: Chungnam Prov.: 20 exx., Gongju-si, Mt. Gyeryongsan, N36°20'27.8", E127°15'11.5" ,, 1-18.vi.2004, KJ Ahn, SM Choi, JS Park, FIT.

Description.

Length 1.4-1.8 mm. Body (Fig. 14) parallel-sided, more or less flattened dorso-ventrally; surface fairly glossy, densely pubescent, with fine microsculpture. Body usually yellowish brown; head and abdominal segments V–VII darker than other parts. Head. Subquadrate, about as wide as long, widest across eyes, slightly narrower than pronotum; eyes moderate in size and prominent, about 1.2-1.3 times longer than tempora; gular sutures moderately separated, diverged basally; infraorbital carina incomplete; cervical carina complete. Antennae (Fig. 35) 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, about 8 macrosetae present on each side of midline; α-sensillum setaceous, about twice longer than ε-sensillum, β- and γ-sensilla reduced, convergent at apex. Mandibles asymmetrical, pointed apically, about 1.6-1.7 times as long as basal width; right one with small internal tooth, anterior margin serrulate; 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 2.2-2.4 times as long as wide, 4 digitiform, filamentous sensilla reaching to basal half. Labium with ligula narrowly long, divided into two lobes in basal half; two medial setae narrowly separated, two basal pores closed together; lateral pseudopores, one setal pore and two real pores present on prementum; labial palpus elongate, with many setulae; palpomere 1 largest, 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 about as long as 1, about 3.0 times longer than wide. Thorax. Pronotum transverse, approximately 1.3 times wider than long, widest at apical third; pubescence directed anteriorly in midline. Metanotal scutum with one long seta and three short setae on each side of midline; mesocoxal cavities narrowly separated, mesoventral process pointed at apex, longer than metaventral process; length ratio of mesoventral process, isthmus and metaventral process 6:4:3. Elytra slightly wider than pronotum; elytron approximately 1.7 times longer than wide, pubescence directed postero-laterally; postero-lateral margin almost straight; hind wings fully developed; flabellum composited one 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. 44) 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 slightly rounded, with 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 53, 62) oval, apical process more or less narrow apically, blunt at apex in ventral aspect. Apical lobe of paramerites (Fig. 71) subtriangular, narrow apically with four setae; a-seta longest, b-seta longer than c- and d- setae. Spermatheca (Fig. 80) with round bursa, duct relatively long, coiled apically.

Distribution.

Korea (South) and Japan.

Remarks.

This species has been known to be collected near marsh ( Sawada 1970). All Korean specimens were collected by FIT in forest.