Summary: | Figs 11-21: Tetartopeus niger (LECONTE) (14, 16-18: lectotype of T. cognatus): (11-12) forebody of specimens from Primorskiy Kray (11) and from Sakhalin (12); (13) male tergite VIII; (14) male sternite VIII; (15) aedeagus in lateral view; (16) ventral process of aedeagus in lateral view; (17) dorsal plate of aedeagus; (18) internal structures of aedeagus (extruded); (19) female tergite VIII; (20) female sternite VIII; (21) female tergite X. Scale bars: 11-12: 1.0 mm; 13-17, 19-21: 0.5 mm; 18: 0.2 mm. Published as part of Assing, V., 2011, On some East Palaearctic Tetartopeus species (Coleoptera: Staphylinidae: Paederinae), pp. 1179-1197 in Linzer biologische Beiträge 43 (2) on page 1184, DOI: 10.5281/zenodo.5326103
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