Abstract
The canaliculatus species group of Stenus (Nestus) is redefined. Four new Palaearctic species of the group are described and illustrated: S. (N.) alopex sp. nov. from the Putorana Highland and Taymyr Peninsula, Russia; S. (N.) canalis sp. nov. from SE Siberia and the Russian Far East; S. (N.) canosus sp. nov. from the Narat Mt Ridge, Chinese Tien Shan; S. (N.) delitor sp. nov. from C & SE Siberia. New distributional data as well as brief analyses of old records for fourteen species described earlier are provided from both Palaearctic and Nearctic material. S. (N.) milleporus Casey, 1884 (= sectilifer Casey, 1884) is revalidated as a species propria. S. (N.) sphaerops Casey, 1884 is redescribed; its aedeagus is figured for the first time; the aedeagus of S. (N.) caseyi Puthz, 1972 as well as aedeagi of eight previously described Palaearctic species are illustrated anew. A key for the identification of all the known Palaearctic species of the group is given. A morphology and ecology based analysis of the main evolutionary trends within the group is provided. A lectotype is designated for S. (N.) melanopus Marsham, 1802; its Siberian and NE European records are supposed to be erroneous; the monotypic melanopus species group is erected.
Highlights
The canaliculatus group was erected by L
In the short preface to the named article, Benick indicated that the keys provided by him were meant for both practical identification and reflecting phylogenetic relationships between different species
It is clear that a harmonious combination of these two principles is an unrealizable ideal, especially in the case of Steninae, which are a group with extensive parallelism in many lineages
Summary
The canaliculatus group was erected by L. Since a key for identification with brief distributional characteristics was given by me for continental Palaearctic species of the canaliculatus group (Ryvkin 1987), some new taxa have been described (Puthz 1987, 2006), and vast material of the group, from both the Palaearctic and the Nearctic, became available to me for study. The material from the former USSR and China is of particular interest since both countries together cover the greater part of the Palaearctic region and are still the least investigated in the faunal aspect. A key for the identification of all the known Palaearctic species of the group is given
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