Thinobius Kiesenwetter, 1844

Lee, Jae-Seok, Yoo, In-Seong & Ahn, Kee-Jeong, 2021, Taxonomy of the coastal Thinobius Kiesenwetter (Coleoptera: Staphylinidae Oxytelinae) in Korea, Zootaxa 4985 (2), pp. 261-268 : 261-262

Genus Thinobius Kiesenwetter, 1844

Thinobius Kiesenwetter, 1844: 355 ; Herman, 1970: 395; 2001: 1735. Yosiityphlus Sawada, 1971: 327 .

See Herman (2001) for more synonymies and references.

Diagnosis. Maxillary palpomere 4 aciculate; protrochantin exposed; epipleural ridge of elytra absent; longitudinal row of tibial spines absent; tarsal formula 2-2-2; basolateral ridges on tergites II–VII present ( Herman 1970).

Habitats. They occur on banks of rivers, streams, ponds and other freshwater, but a few are found in intertidal mudflats or fine gravels ( Frank & Ahn 2011).

Key to the species of Korean coastal Thinobius

1. Antennomeres 4–6 transverse ( Fig. 2A ); metaventral carinae present ( Fig. 2F ); paramere short, lateral part of aedeagus without serrated pattern ( Fig. 3B )............................................................ Thinobius jejuensis sp. n

- Antennomeres 4–6 elongate ( Figs. 4A and 6A ); metaventral carinae absent ( Figs. 4E and 6E ); paramere long, lateral part of aedeagus with serrated pattern ( Figs. 5B and 7B )............................................................ 2

2. Eye present ( Fig. 4B ); hind wings not reduced; anterior part of metaventrite with setae.......... Thinobius koreanus sp. n.

- Eye absent ( Fig. 6B ); hind wings extremely reduced; anterior part of metaventrite without setae....... Thinobius kuroshio

Figures

FIGURE 2. Thinobius jejuensis sp. n. A: antenna; B: head, dorsal aspect; C: head, ventral aspect; D: prosternum, ventral aspect; E: scutellum, dorsal aspect; F: meso- and metaventrite, ventral aspect. Scales = 0.1 mm. Circle in B shows magnification of sculptures.

FIGURE 3. Thinobius jejuensis sp. n. A: aedeagus, ventral aspect; B: aedeagus, lateral aspect; C: spermatheca with sternite IX, dorsal aspect. Scales = 0.1 mm.

FIGURE 4. Thinobius koreanus sp. n. A: antenna; B: head, dorsal aspect; C: pronotum, dorsal aspect; D: prosternum, ventral aspect; E: meso- and metaventrite, ventral aspect; F: ring structure with female genital appendage. Scales = 0.1 mm. Circles in B and E show magnification of sculptures.

FIGURE 5. Thinobius koreanus sp. n. A: aedeagus, ventral aspect; B: aedeagus, lateral aspect; C: spermatheca. Scales = 0.1 mm.

FIGURE 6. Thinobius kuroshio. A: antenna; B: head, dorsal aspect; C: head, ventral aspect; D: prosternum, ventral aspect; E: meso- and metaventrite, ventral aspect; F: ring structure with female genital appendage. Scales = 0.1 mm. Circles in B, C, and E show magnification of sculptures.

FIGURE 7. Thinobius kuroshio. A: aedeagus, ventral aspect; B: aedeagus, lateral aspect; C: spermatheca. Scales = 0.1 mm.