Tasgius

Stephens, 1829

large rove beetles

Species Guides

Tasgius is a of large rove beetles in the Staphylinidae, containing at least 20 described . Members of this genus are notable for their relatively large size compared to most rove beetles. At least one species, T. winkleri, has been introduced to North America from Europe and has established across multiple U.S. states and Canadian provinces. The genus is characterized by morphological features including dilated front in males.

Tasgius by (c) L.J. Lamera, some rights reserved (CC BY), uploaded by L.J. Lamera. Used under a CC-BY license.

Tasgius ater by (c) Helen Bovill, some rights reserved (CC BY), uploaded by Helen Bovill. Used under a CC-BY license.

Tasgius winkleri by (c) Owen Strickland, some rights reserved (CC BY), uploaded by Owen Strickland. Used under a CC-BY license.

Pronunciation

How to pronounce Tasgius: /ˈtæzdʒiəs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Images

Distribution

Native to the Palearctic region, including Denmark, Norway, and Sweden. At least one (T. winkleri) has been introduced to North America, with records from New York, New Hampshire, Pennsylvania, Michigan, Illinois, Washington, Oregon, California, Vermont, and the Canadian provinces of Ontario and British Columbia. The introduced range continues to expand westward.

Behavior

Rove beetles in this , like other Staphylinidae, are capable of secreting defensive substances or odors. Males possess dilated front (expanded 'feet'), a sexually dimorphic trait. At least one introduced (T. winkleri) exhibits , being found almost exclusively in human-disturbed .

Human Relevance

T. winkleri has been documented as an introduced in North America since at least 1931 (first reported 1938), with expanding range. This species is , thriving in gardens, parks, leaf litter, and wetland edges— heavily disturbed by human activity. No economic or medical significance has been documented for this .

Similar Taxa

PlatydracusBoth contain large rove beetles and can appear superficially similar, but Tasgius can be distinguished by specific morphological characters including details of setal placement and male genitalia.

More Details

Taxonomic history

Tasgius winkleri was formerly classified under the name Tasgius globulifer until 1987, when taxonomic revision split this into separate including T. melanarius.