Nebrioporus depressus (Fabricius, 1775)

Toledo, Mario, 2009, Revision in part of the genus Nebrioporus Régimbart, 1906, with emphasis on the N. laeviventris-group (Coleoptera: Dytiscidae), Zootaxa 2040, pp. 1-111 : 29

The depressus -group

This group, as here defined, is composed of 15 known species and its distribution range covers Europe, the whole Palearctic Asia, Japan, Taiwan, Canada and northern USA; one, apparently isolated, species lives in Yemen. Its Western Palaearctic members are well known (although the question of the statuses of N. depressus and N. elegans still remains open) as they have been treated by many authors both historically and more recently. Most of the species of this group, hence, have been revised recently in the following works, to which I refer the reader for details: Angus & Shirt (1992), the depressus complex, composed by the Holarctic N. depressus , the Palearctic N. elegans and the Nearctic N. macronychus and N. rotundatus ; Angus et al. (1992), the Iberian carinatus complex, composed by N. carinatus , N. croceus and N. fabressei ; Toledo (1998), the Chinese species (see the key below). Only four species are discussed here, two of which have been revised.