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Species Tasgius ater

Tasgius melanarius? - Tasgius ater Rove Beetle - Tasgius ater Strange insect. - Tasgius ater Tasgius ater Tasgius? - Tasgius ater Rove beetle - Tasgius ater Tasgius? - Tasgius ater Rove Beetle - Tasgius ater
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Staphyliniformia)
Superfamily Staphylinoidea (Rove, Carrion and Fungus Beetles)
Family Staphylinidae (Rove Beetles)
Subfamily Staphylininae (Large Rove Beetles)
Tribe Staphylinini
Subtribe Staphylinina
Genus Tasgius
Species ater (Tasgius ater)
Synonyms and other taxonomic changes
=Ocypus ater
Explanation of Names
Tasgius ater (Gravenhorst 1802)
15-20 mm
Pronotum shiny, with smooth midline like in the other species, with punctures of two sizes (diagnostic),
larger punctures at least their diameter apart;

Mandibles with triangular tooth on inner margin (subgenus Tasgius s.str.);

Very useful, and not in the books: Abdomen with several apparent tactile setae both laterally and dorsally;
length of setae about = 3rd antennal segment.

native to w. Palaearctic, introduced elsewhere (NA, New Zealand); occurs across Canada and in scattered US locations except sw. US(1)
under debris near water (including marine situations) but also common near habitations (in gardens, cellars, shacks)(1)
first recorded in NA in 1802(1)
Internet References
Works Cited
1.Introduced Staphylinidae (Coleoptera) in the Maritime Provinces of Canada
Majka C.G., Klimaszewski J. 2008. The Canadian Entomologist 140: 48-72.
2.Staphylinidae of eastern Canada and the adjacent United States. Keys to subfamilies; Staphylininae: ...
Brunke A., Newton A., Klimaszewski J., Majka C.G., Marshall S. 2011. Canadian Journal of Arthropod Identification 12: 1-110.