Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Spring 2021 gathering in Louisiana, April 28-May 2. Here's how to add your images.

National Moth Week 2020 photos of insects and people.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama


Genus Tasgius

Beetle? - Tasgius ater Black rove 1 - Tasgius melanarius 8002357 - Tasgius Tasgius ater Ocypus sp.? - Tasgius winkleri Tasgius melanarius (?) - Tasgius melanarius Large Rove Beetle (Genus Ocypus)? - Tasgius Ocypus nitens or Tasgius? - Tasgius
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) ; more hints on species pages.
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.