Pterostichus (Derus), Motschulsky, 1844

Bousquet, Yves, 2012, Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico, ZooKeys 245, pp. 1-1722 : 499

Subgenus Derus Motschulsky, 1844

Derus Motschulsky, 1844: xi. Type species: Argutor politus Motschulsky, 1844 (= Platysma ravum Lutshnik, 1922) by monotypy. Etymology. From the Greek dere (neck, by extension pronotum) [masculine].

Derulus Tschitschérine, 1896a: 112. Type species: Feronia samojedora Sahlberg, 1880 designated by Lindroth (1966: 476). Synonymy established by Lindroth (1966: 476).

Diversity.

Twenty-three species (Lorenz 2005: 269), mostly in the arctic and subarctic areas, in North America (one species), Asia (21 species), and eastern Europe (three species).

Identification.

No revision or identification key is available for the species. Lindroth (1966: 476-478) covered the North American species.