Atheta (Microdota) jangtaesanensis Lee & Ahn

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 : 67-68

Taxon classification Animalia Coleoptera Staphylinidae

Atheta (Microdota) jangtaesanensis Lee & Ahn sp. n. Figs 4, 16-21, 29, 38, 47, 56, 65, 74

Material examined.

Holotype, labeled as follows: 'KOREA: Chungnam prov., Daejeon-si, Seo-gu, Jangan-dong, Mt. Jangtaesan, N36°13'03.3", E127°20'36.2", 258 m, 28 III 2012, DH Lee, TK Kim, SG Lee, leaf litter; HOLOTYPE, Atheta (Microdota) jangtaesanensis Lee and Ahn, Desig. S.-G. Lee and K.-J. Ahn 2015.' Deposited in CNUIC, Daejeon. Paratypes, 11 exx. (total); 4 exx., same data as holotype; 6 exx., same data as holotype except '5 IV 2013, SG Lee’.

Description.

Length 1.3-1.6 mm. Body (Fig. 4) slender and parallel-sided, more or less flattened dorso-ventrally; surface significantly glossy, densely pubescent, with fine microsculpture. Body usually reddish brown to reddish black; pronotum slightly paler than other parts; legs yellowish brown. Head. Subquadrate, approximately 1.0-1.1 times wider than long, widest behind eyes, slightly narrower than pronotum; eyes relatively small and prominent, about 0.7-0.8 times longer than tempora; gular sutures moderately separated, diverged basally; infraorbital carina incomplete; cervical carina almost complete. Antennae (Fig. 29) dilated apically; antennomeres 1-3 elongate, 1 longest, 4-10 transverse, 11 about as long as preceding two combined. Mouthparts. Labrum (Fig. 16) transverse, anterior margin emarginate; two lateral sensilla and about 8-9 macrosetae present on each side of midline; α-sensillum relatively long and setaceous, more than twice as long as ε-sensillum, β- and γ-sensilla reduced; epipharynx as in Fig. 17. Mandibles asymmetrical, pointed apically, approximately 1.7 times as long as basal width; right one (Fig. 18) 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 2.2-2.4 times longer than wide, 3 slightly longer than 2, about 2.6-2.8 times as long as wide, 4 digitiform, filamentous sensilla reaching to basal half (Fig. 19). Labium (Fig. 20) 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 twice longer than wide, with γ-setula close b-setula, 2 shortest, about as long as wide, 3 dilated apically, about 2.4-2.5 times longer than wide. Mentum (Fig. 21) trapezoidal, anterior margin emarginate, v-seta relatively long. Thorax. Pronotum transverse, approximately 1.2-1.3 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 distinctly pointed at apex, about as long as isthmus and metaventral process combined; length ratio of mesoventral process, isthmus and metaventral process 13:9:4. 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 about one setose lobe. Legs. Slender and long, with dense pubescence and setae; tibia with two spurs at apex; length ratio of tarsomeres 17:20:20:42 (protarsus); 20:25:24:23:44 (mesotarsus); 29:30:30:28:57 (metatarsus); one empodial seta present, shorter than claw. Abdomen. Parallel-sided, widest at middle; surface fairly glossy and densely pubescent, with fine and imbricate microsculpture; macrochaetal arrangement of tergites II–VI 01-02-12-12-13; male tergite VIII with 4 macrosetae on each side of midline, posterior margin truncate, slightly emarginate in median region; male sternites V–VII with many pores in anterior margin, VIII with 7 macrosetae on each side of midline, posterior margin round; posterior margin of female tergite VIII (Fig. 38) subtruncate; posterior margin of female sternite VIII broadly rounded, slightly emarginate at middle, with long and short marginal setae; minute setae present in median region. Genitalia. Median lobe (Figs 47, 56) entirely oval, apical process narrow apically, blunt at apex in ventral aspect. Apical lobe of paramerites (Fig. 65) elongate and subparallel-sided with four setae, b-seta longest, other setae subequal in length. Spermatheca (Fig. 74) with conical shaped umbilicus, duct sinuate and coiled apically.

Distribution.

Korea (South).

Remarks.

This species is similar to Atheta (Microdota) muris , but can be distinguished by the small body; posterior margin of male tergite VIII with broad process; apical process of median lobe of aedeagus broad; annellus of internal sac relatively large; different shape of spermatheca. All specimens were collected by sifting leaf litter piled up in a ditch.

Etymology.

Named after the type locality Mt. Jangtaesan, where all of specimens were collected.