New species and records of Stenus (Nestus) of the canaliculatus group, with the erection of a new species group (Insecta: Coleoptera: Staphylinidae: Steninae)

• Published in: European Journal of Taxonomy
• Main Author: Alexandr B. Ryvkin
• Format: Article in Journal/Newspaper
• Language: English
• Published: Consortium of European Natural History Museums 2012
• Subjects: Holarctic; Palaearctic; Nearctic; fauna; bionomics; Zoology; QL1-991; Botany; QK1-989; Taymyr; Taymyr Peninsula; Siberia
• Online Access: https://doi.org/10.5852/ejt.2012.13; https://doaj.org/article/131293efcf034588a7f640c512cd0850

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 (= s ectilifer 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.