Trichiusa

Casey, 1893

Species Guides

Trichiusa is a of small rove beetles (Staphylinidae: Aleocharinae) comprising approximately 15 described distributed across North America and Europe. The genus was revised taxonomically in 2015, with several species synonymized under Trichiusa pilosa. Canadian records document presence across multiple provinces and territories from Nova Scotia to Yukon Territory.

Trichiusa hirsuta by no rights reserved, uploaded by Nick Bédard. Used under a CC0 license.

Trichiusa hirsuta 322764378 by Nick Bédard. Used under a CC0 license.

Trichiusa hirsuta 322764375 by Nick Bédard. Used under a CC0 license.

Pronunciation

How to pronounce Trichiusa: //trɪˈkaɪ.jʊ.sə//

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Identification

As a member of the Aleocharinae, Trichiusa possess the characteristic short exposing most of the typical of rove beetles. Specific diagnostic features distinguishing Trichiusa from related within the Athetini require examination of subtle morphological characters such as spermatheca structure, tarsal formula, and male genitalia; these traits are documented in taxonomic revisions rather than field guides.

Images

Distribution

North America and Europe. In North America: Canada (Alberta, British Columbia, Manitoba, Nova Scotia, Northwest Territories, Ontario, Saskatchewan, Yukon Territory); USA (Idaho, Indiana, Kansas, Ohio, Rhode Island, Vermont). European records include Denmark, Norway, and Sweden.

Similar Taxa

Other Athetini generaTrichiusa is distinguished from closely related aleocharine by combinations of subtle morphological characters including spermathecal shape, male genitalia structure, and tarsal segmentation; accurate identification requires dissection and reference to taxonomic revisions.

More Details

Taxonomic revision

In 2015, Klimaszewski et al. established four new synonyms for Trichiusa pilosa Casey: T. atra Casey, T. monticola Casey, T. parviceps Casey, and T. postica Casey. Previous Canadian records from Nova Scotia and Ontario attributed to T. postica were reidentified as T. pilosa.