Thinobius jejuensis Lee & Yoo & Ahn 2021, sp. n.
Creators: name: Lee, Jae-Seok
name: Yoo, In-Seong
name: Ahn, Kee-Jeong
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Thinobius
Thinobius jejuensis

description: Thinobius jejuensis Lee & Ahn sp. n.
(Figs. 1A, 2–3)
Description. Length 1.04–1.30 mm. Body flattened, surface pubescent; dark brown. Head. Almost as long as wide and slightly narrower than pronotum; widest across eyes; clypeus trapezoidal; eye moderate in size and rounded in lateral aspect, with large eye facets and interfacetal setae; temple well developed, about 0.8 times as long as eye length in dorsal view; gular suture fused and broadly divergent in anterior and posterior part; neck well developed, distinctly transversely reticulate sculptures with some short setae (Figs. 2B–C); antenna slender, moderately elongate, and pubescent, antennomere 1 longest, 4 and 6 shortest, 1–2 and 7–11 elongate, 3 and 5 slightly elongate, 4 and 6 transverse (Fig. 2A). Mouthparts. Labrum transverse, semicircula; mandible triangle, apex bifid, with one blunt subapical tooth, prostheca and molar tooth well developed; maxillary palpus with four palpomeres, palpomere 1 transverse and small, 2 slightly dilated to apex, 3 largest, 2–3 with dense setae; apical margin of 3 about 3.0 times as wide as basal margin of 4; labial palpus with three elongate palpus, apex of palpomere 1 with two long setae and one pore, apex of 2 with one pore, 3 with few short sensilla at apex; mentum quadrate with one pair of long macrosetae and many setae. Thorax. Pronotum transverse, width 0.24–0.27 mm, widest about anterior third, surface pubescent; prosternum with few setae (Fig. 2D); scutellum an inverted triangle, anterior margin of scutellum emarginate, posterior part reticulate with many setae (Fig. 2E); elytron elongate and pubescent, posterior margin with membranous lobe; hind wing present; mesoventral process slightly extended and blunted at apex; metaventral carinae incomplete; metaventrite with two pairs of long macrosetae and dense setae (Fig. 2F); all tibiae with one long macroseta in middle. Abdomen. Posterior margin of tergite VII with fringe of setae; postero-lateral margin of tergite VIII slightly convex. Secondary sexual characteristics. Male sternite VIII emarginate, female with linear form; male tergite IX with ventral structs, struts as long as remainder, female tergite IX without ventral struts. Male sternite IX elongate, female sternite IX pentagon. Genitalia. Aedeagus oval (Figs. 3A–B); paramere short; spermatheca as in Fig. 3C.
Type material. Holotype, 1 ♂, labeled as follows: KOREA: Jeju Prov., Seogwipo-si, Haye-dong, N33°13'54.45" E126°22'19.81" 2 m, 19 X 2014, KJ Ahn, IS Yoo, JS Lee, 10-20 cm deep under/in gravels on seashore. ‘ Holotype, Thinobius jejuensis Lee and Ahn, Desig. Jae-Seok Lee and Kee-Jeong Ahn 2021 ’ ‘ Deposited in the Chungnam National University Insect Collection, Korea’. Paratypes, 3 exx., labeled as same as Holotype (1 on slide; 1 on CNUIC voucher); 30 exx., same data as former except for ‘ N33°13'54.20" E126°22'18.49" 2 m, 05 VIII 2020, JS Lee, JY Park, YJ Kim, flotation’. 24 exx., same data as former except for ‘Yeraehaean-Ro, N33.232254, E126.371442, 19 X 2020, KJ Ahn, Under pebbles/gravels by flotation’.
Distribution. Korea (Jeju island).
Remarks. This species is similar to T. marinus, but can distinguished by the length of temple and the shape of antennomeres. Temple is shorter than the diameter of eye in T. jejuensis Lee & Ahn, sp. n. (Fig. 2B), but longer than the diameter of eye in T. marinus (Cameron, 1917). In addition, antennomeres 5 and 7–8 are elongate in the new species (Fig. 2A), but 4–8 are transverse in T. marinus. All specimens were collected on Jeju-do island, Korea
description: Published as part of Lee, Jae-Seok, Yoo, In-Seong & Ahn, Kee-Jeong, 2021, Taxonomy of the coastal Thinobius Kiesenwetter (Coleoptera: Staphylinidae Oxytelinae) in Korea, pp. 261-268 in Zootaxa 4985 (2) on pages 263-264, DOI: 10.11646/zootaxa.4985.2.9, http://zenodo.org/record/4943584