Atheta (Microdota) subcrenulata 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 : 82-83

Taxon classification Animalia Coleoptera Staphylinidae

Atheta (Microdota) subcrenulata Bernhauer, 1907 Figs 15, 36, 45, 54, 63, 72, 81

Atheta (Microdota) subcrenulata Bernhauer, 1907: 403; Paśnik 2001: 209; Smetana 2004: 388 (as valid species).

Atheta (Amidobia) subcrenulata : Sawada 1974: 166 (as valid species).

Material examined.

Syntype, 2♂♂, labeled as in Figs 87-88. NORTH KOREA: 1 ex., Korea 21-25. 5. 74 pr. Ćhongdźin-si Exp. Inst.Zool Cr. [North Korea, Hamgyeongbuk Prov., Cheongjin-si, 21-25.v.1974, ISEA]; 1 ex., Korea 1981 Pekson-ri A. Szeptycki [North Korea, Hwanghae Prov., Mt. Suyangsan, 15.vi.1981, A. Szeptycki]. SOUTH KOREA: Chungnam Prov.: 12 exx., Nonsan-si, Beolgok-myeon, N36°09'10.5", E127°18'24.9", 236 m, 22.v.2011, IS Yoo, decaying red pepper; 2 exx., Daejeon-si, Seo-gu, Jangan-dong, Jangtaesan Recreational Forest, N36°13'4.32", E127°20'34.44", 257 m, 17.iii.2011, IS Yoo, YH Kim, SG Lee, leaf litters; Chungbuk Prov.: 6 exx., Yeongdong-gun, Sangchon-myeon, Mulhan-ri, Mt. Minjujisan, N36°03'35.2", E127°52'31.3" ,, 518 m, 18.v.2011, JG Lee, TK Kim, decaying persimmon; Gangwon Prov.: 11 exx., Inje-gun, Inje-eup, Deoksan-ri, N38°04'46.1", E128°14'08.0", 384 m, 11.vi.2011, YH Kim, JH Song, SG Lee, decaying vegetables; Jeju Prov.: 10 exx., Jeju-si, Aewol-eup, N33°22'29.3", E126°30'37.9" ,, 21.v.2006, SI Lee, decaying vegetables.

Description.

Length about 1.5-2.0 mm. Body (Fig. 15) slender and parallel-sided, more or less flattened dorso-ventrally; surface fairly glossy, densely pubescent, with fine microsculpture. Body usually reddish brown to dark brown; head and abdomen almost black, darker than other parts; 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 longer than tempora; gular sutures moderately separated, diverged basally; infraorbital carina complete; cervical carina complete. Antennae (Fig. 36) dilated apically; antennomeres 1-3 elongate, 1 longest, 4-10 transverse, 11 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 long and setaceous, twice longer than ε-sensillum, β- and γ-sensilla reduced. Mandibles asymmetrical, pointed apically, approximately 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 region, two isolated spines present; maxillary palpus elongate, with pubescence and long setae; palpomere 1 smallest and about twice as long as wide, 2 about 2.5-2.6 times longer than wide, 3 slightly longer than 2, about 2.5-2.7 times as long as wide, 4 digitiform, filamentous sensilla convergent apically, reaching to basal half. Labium with ligula divided into two lobes in basal half; two medial setae closed together; two basal pores narrowly separated; lateral pseudopores, one setal pore and two real pore present on prementum; labial palpus elongate, with many setulae; palpomere 1 largest, about 1.4-1.5 times longer than wide, with γ-setula close b-setula, 2 shortest, about 1.2-1.4 times longer than wide, 3 dilated apically, about 2.3-2.5 times longer than wide. Thorax. Pronotum transverse, approximately 1.3 times wider than long, widest at apical third; midline of pubescence directed anteriorly. Metanotal scutum with one long seta and two short setae on each side of midline; mesocoxal cavities narrowly separated, mesoventral process distinctly pointed at apex, longer than isthmus and metaventral process combined; metaventral process shorter than isthmus. Elytra slightly wider than pronotum; elytron approximately 1.6 times longer than wide, pubescence directed postero-laterally; postero-lateral margin almost straight; hind wings fully developed; flabellum composited five setose lobes. Legs. Slender and long, with dense pubescence and setae; tibia with two spurs at apex; length ratio of tarsomeres 18:19:20:47 (protarsus); 22:23:23:24:42 (mesotarsus); 30:29:29:26:50 (metatarsus); one empodial seta present, shorter than claw. Abdomen. Parallel-sided, widest at middle; surface fairly glossy and densely pubescent, with reticulate microsculpture; macrochaetal arrangement of tergites II–VI 01-02-12-12-13; male tergite VIII (Fig. 45) with 4 macrosetae on each side of midline, posterior margin truncate, minutely crenate; male sternites V–VII with many pores in anterior margin, VIII with 7 macrosetae on each side of midline, posterior margin slightly rounded, with long marginal seta; posterior margin of female tergite VIII subtruncate; posterior margin of female sternite VIII broadly rounded, with long and short marginal setae; minute setae present in median region. Genitalia. Median lobe (Figs 54, 63) oval, apical process convergent at apex in ventral aspect; internal sac complicated. Apical lobe of paramerites (Fig. 72) with four setae, subequal in length. Spermatheca (Fig. 81) with conical umbilicus, duct sinuate and coiled apically.

Distribution.

Korea (South, North), China (Beijing and Zhejiang) and Japan.

Remarks.

This species is very similar to Atheta (Microdota) amicula , but can be distinguished by the internal sac of median lobe and spermatheca.