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Genus Tasgius

Beetle? - Tasgius ater 6016389 rove beetle - Tasgius melanarius Black Rove Beetle - Tasgius winkleri Rove Beetle - Tasgius ater Tasgius ? - Tasgius Tasgius ater Tasgius winkleri  - Tasgius winkleri Large 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
Synonyms and other taxonomic changes
treated by some workers as a subgen. of Ocypus
Explanation of Names
Tasgius Stephens 1829
3 spp. in our area (all adventive)(1), 45 spp. total(2)
15-20 mm
Large, black; mandibles rather slender, with one tooth on inner edge. Last segment of labial palpi dilated and terminally truncate, seen here:

key to spp. here(3)
native to the Palaearctic (widespread)(2), adventive in NA: ne. & nw. US + adjacent Canada(1)
especially under debris near water; also common in various synanthropic situations, incl. in urban areas(1)
See Also
Ocypus spp. are very similar, but have stouter mandibles with small teeth in front of the big one, and different labial palpi
Works Cited
1.American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia
Arnett, R.H., Jr., and M. C. Thomas. (eds.). 2000. CRC Press LLC, Boca Raton, FL.
2.Newton A.F., Thayer M.K. Catalog of higher taxa of Staphyliniformia and genera and subgenera of Staphylinoidea [online]
3.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.