Acrotona (Acrotona) aterrima (Gravenhorst, 1802) (Fig. 1A) Aleochara aterrima Gravenhorst, 1802: 83. Bolitochara fuscula Mannerheim, 1830: 84. Aleochara mannerheimii C. R. Sahlberg, 1831: 380. Aleochara brunnipes Stephens, 1832: 133. Aleochara luripes Stephens, 1832: 136. Aleochara obscurata Stephens, 1832: 137. Homalota lugens Kiesenwetter, 1844: 319. Atheta (Acrotona) aterrima: Brundin, 1952: 121; Palm, 1970: 288; Benick & Lohse, 1974: 187; Yosii & Sawada, 1976: 94. Acrotona aterrima: Paśnik, 2001: 202; Smetana, 2004: 362. Acrotona (Acrotona) aterrima: Schülke & Smetana, 2015: 506; Ahn et al., 2017: 292. Description. Length 2.0– 2.5 mm. Body (Fig. 1A) surface glossy and densely pubescent, with fine microsculpture. Body dark brown to black; antennae, elytra and legs slightly paler than other parts. Head. Subcircular, about as wide as long, widest at middle, distinctly narrower than pronotum; eyes large and slightly prominent, about as long as temples; gular sutures moderately separated, diverged basally. Antennae long and slender, slightly longer than head and pronotum combined; antennomeres compactly close together, 1–3 elongate, 1 longest, 2 slightly longer than 3, 4–10 quadrate to subquadrate, 11 longer than wide, about as long as preceding two combined. Thorax. Pronotum approximately 1.5 times as wide as long, widest in basal third to half, pubescence directed posteriorly in midline. Elytra slightly transverse, slightly wider than pronotum; elytron approximately 1.5 times as long as wide, pubescence directed posteriorly and postero-laterally; postero-lateral margin slightly sinuate; hind wings fully developed. Legs. Slender and long, with pubescence and macrosetae; tibiae with two spurs at apex; metatarsomere 1 about as long as 2. Abdomen. Widest in segments III–IV; surface glossy and densely pubescent, with narrowly imbricate microsculpture; macrochaetal arrangement 01-13-13-13-13; male tergite VIII with four macrosetae on each side of midline, posterior margin truncate; male sternite VIII with seven macrosetae on each side of midline, posterior margin convex, slightly round, with inconspicuous and long marginal setae; posterior margin of female tergite VIII similar to male’s; female sternite VIII round, with long and short marginal setae. Aedeagus. Median lobe narrowly ovate and widest in basal third, apical process short and convergent at apex in ventral aspect (Brundin, 1952: figs. 40–41; Palm, 1970: PL. XX, 194; Yosii & Sawada, 1976: figs. 39J–L). Apical lobe of paramerites short, with four setae; a-seta slightly longer than b- and d-setae, c-seta short and close together (Yosii & Sawada, 1976: figs. 39M). Spermatheca. Umbilicus absent; duct densely coiled (Palm, 1970: PL. XX, 194; Yosii & Sawada, 1976: figs. 39O). Type material. Lectotype, ♂, labeled as follows: ‘ Germania Nr. 5506, Typus, Zool. Mus. Berlin, TYPE A. aterrima Grav. LECTO-TYPE V. Mahler des. 1986, aterrima Er. at. aterrima gr., Acrotona aterrima (Grav.) Det. Klimaszewski 2004 ’. Syntypes, 4 exx., Germania Nr. 5506, Typus, Zool.Mus. Berlin, Acrotona aterrima (Grav.) Det. Klimaszewski 2004. Material examined. NORTH KOREA: 5 exx., Corea sept. 1983 Myohyang Mts. Exp. Inst.Zool.Cr. [North Korea, Pyeonganbuk Prov., Mt. Myohyangsan, ix 1983, ISEA]. Distribution. Korea (North), Russia (East Siberia, West Siberia), Kazakhstan, Uzbekistan and Europe. Remarks. This species was recorded by Paśnik (2001) in North Korea but no specimen has been collected from South Korea. We could not describe the mouthparts in detail because specimens were not available for dissection.

Published as part of Lee, Seung-Gyu & Ahn, Kee-Jeong, 2018, A taxonomic review of Korean Acrotona Thomson with a description of new species (Coleoptera, Staphylinidae, Aleocharinae), pp. 247-263 in Zootaxa 4418 (3) on pages 248-250, DOI: 10.11646/zootaxa.4418.3.3, http://zenodo.org/record/3769610