Atheta (Microdota) muris 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 : 73

Taxon classification Animalia Coleoptera Staphylinidae

Atheta (Microdota) muris Sawada, 1974 Figs 8, 32, 41, 50, 59, 68, 77

Atheta (Amidobia) muris Sawada, 1974: 176.

Atheta (Microdota) muris : Smetana 2004: 387 (as valid species).

Material examined.

SOUTH KOREA: Chungnam Prov.: 1 ex., Buyeo-gun, Oesan-myeon, Gaedeok-ri, Mt. Wolmyeongsan, 1.vi.2000, US Hwang, HJ Kim, sifting; 26 exx., Daejeon-si, Chungnam National Univ., 13.v.2002, JS Park, sifting; 7 exx., Daejeon-si, Yuseong-gu, Chungnam National Univ., 26.ix.2002, SM Choi, JH Choi, sifting; 1 ex., Daejeon-si, Mt. Sikjangsan, Secheon park, 17.vii.2000, HJ Kim, mushroom; 1 ex., Gongju-si, Mt. Gyeryongsan, 23.vi.2000, HJ Kim, near stream; 1 ex., Hongseong-gun, Gwangcheon-eup, Oseosan, 20.vi.1999, HJ Kim, near stream; Gangwon Prov.: 6 exx., Pyeongchang-gun, Odaesan, Jeokmyeolbogung, 8.vii.1998, KJ Ahn, mushroom; Gyeonggi prov.: 6 exx., Namyangju-si, Sudong-myeon, Oebang-ri, Mt. Chukryeongsan, 13.ix.1999, US Hwang, HJ Kim, sifting.

Description.

Length 1.4-1.9 mm. Body (Fig. 8) slender and parallel-sided, more or less flattened dorso-ventrally; surface distinctly glossy, densely pubescent, with fine microsculpture. Body usually yellowish brown; head and abdominal segments V–VII dark brown to black; pronotum slightly paler than elytra. 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. 32) dilated apically; antennomeres 1-3 elongate, 1 longest, 4-10 transverse, 11 longer than wide, slightly shorter than 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 1.5-1.6 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 1.8-2.0 times as long as wide, 2 about 2.5-2.7 times longer than wide, 3 slightly longer than 2, about 2.2-2.5 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 close; lateral pseudopores and two real pores present on prementum; labial palpus elongate, with many setulae; palpomere 1 largest and dilated basally, about 1.5-1.7 times longer than wide, with γ-setula close b-setula, 2 shortest, about 1.4-1.6 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 about two short setae on each side of midline; mesocoxal cavities narrowly separated, mesoventral process pointed at apex, longer metaventral process; length ratio of mesoventral process, isthmus and metaventral process 15:8:6. Elytra slightly wider than pronotum; elytron approximately 1.5-1.6 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 18:20:20:44 (protarsus); 20:23:24:24:45 (mesotarsus); 31:31:31:30:53 (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. 41) with 4 macrosetae on each side of midline, posterior margin truncate; male sternites V–VII with many pores in anterior margin, VIII with 8 macrosetae on each side of midline, posterior margin broadly rounded, with long marginal setae; posterior margin of female tergite VIII subtruncate; posterior margin of female sternite VIII slightly emarginate at middle, long and short marginal setae; minute setae present in median region. Genitalia. Median lobe (Figs 50, 59) oval, apical process abruptly convergent at apex in ventral aspect. Apical lobe of paramerites (Fig. 68) elongate and subparallel-sided with four setae; a- and b-setae longer than c- and d- setae. Spermatheca (Fig. 77) with duct relatively long, coiled apically.

Distribution.

Korea (South) and Japan.

Remarks.

Some specimens were found on mushrooms in forests.