Bembidion (Peryphus) obscurellum Motschulsky, 1845

Neri, Paolo & Toledano, Luca, 2021, Geographic and taxonomic notes, addenda and corrigenda on the subtribe Bembidiina Stephens, 1827 of the 2017 ' Catalogue of Palaearctic Coleoptera' (Coleoptera, Carabidae, Bembidiina), ZooKeys 1044, pp. 563-587 : 563

Bembidion (Peryphus) obscurellum Motschulsky, 1845

Bembidion (Peryphus) obscurellum turanicum Csiki, 1928

Bembidion (Peryphus) obscurellum fumipenne Fassati, 1957

Bembidion (Peryphus) obscurellum thibeticum Fassati, 1957

Bembidion (Peryphus) obscurellum insperatum Lutshnik, 1938

Notes.

Fassati (1957) describes Bembidion (Peryphus) fuscicrum thibeticum ssp. nov. and Bembidion (Peryphus) fuscicrum fumipenne nat. nov.; they are distinguished from the nominotypical form only by the coloration of the elytra. Lindroth (1963) synonymizes the following taxa with B. obscurellum Motschulsky, 1845: B. fuscicrum Motschulsky, 1855, B. fuscicrum turanicum Csiki, 1928, B. fumipenne and B. thibeticum , the last two taxa because they are only color varieties. Kryzhanovskij et al. (1995) listed B. turanicum as a subspecies of B. obscurellum and retained B. fumipenne and B. thibeticum as varieties only; moreover Belousov’s note (Kryzhanovskij et al. 1995: 85, note no. 158) reports that the subspecific situation of this polymorphic species is provisional. Recently, some authors (e.g., Lorenz 2005; Marggi et al. 2017) still list B. turanicum , B. fumipenne , and B. thibeticum as subspecies of B. obscurellum .

In light of our studies we maintain that the synonymies proposed by Lindroth (1963) were correct; moreover, our colleague Liang Hongbin (IZCAS, Beijing) confirms our opinion based on the study of hundreds of specimens from Mongolia that clearly show the variability of the species (Liang Hongbin, pers. comm.).

Regarding Bembidion (Peryphus) obscurellum insperatum Lutshnik, 1938, since its discriminating characters are not exclusive but shared by other subspecies, we evaluated the synonymy expressed in Marggi et al. (2017) and add to the distribution of the species the Russian Caucasus (ST), the region mentioned in the description, as already reported in Kryzhanovskij et al. (1995): Ciscaucasia, Western and Central Greater Caucasus. Current distribution: E: DE, NT, ST, SV; A: AF, CH, ES, IN, KA, KI, KZ, MG, TM, TR, WS, XIZ; NAR.