Thesiastes

Casey, 1893

Species Guides

Thesiastes is a of ant-loving beetles (myrmecophiles) in the rove beetle Staphylinidae. The genus was established by Casey in 1893 and contains at least four described distributed in North America. These beetles are members of the Pselaphinae, a diverse group of small, often cryptic beetles associated with leaf litter and colonies.

Pronunciation

How to pronounce Thesiastes: /θiˈsi.a.stɛs/

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Identification

Members of Thesiastes can be distinguished from other Pselaphinae by characters of the and other genitalic structures, though specific diagnostic features require expert examination. The genus belongs to the tribe Trichonychini and subtribe Panaphantina, which can be separated from related groups by subtle differences in antennal structure and body proportions.

Habitat

colonies; associated with myrmecophilous . Specific microhabitat details for the are poorly documented.

Distribution

North America. have been recorded from the United States, with Thesiastes debilis and Thesiastes pumilis originally described from eastern North America, and Thesiastes atratus and Thesiastes fossulatus described from additional regions.

Host Associations

Ants - myrmecophileAnt-loving beetles; specific unknown

Behavior

Myrmecophilous; lives in association with colonies. The nature of this association (whether inquilinous, synoeketic, or other) has not been detailed for this .

Similar Taxa

Other Panaphantina generaSimilar body plan and myrmecophilous habits; distinguished by male genitalia and antennal structure
Other Trichonychini generaShare Pselaphinae characteristics; require detailed morphological examination for separation

More Details

Taxonomic history

The was erected by Casey in 1893. Two were originally described in other genera and later transferred: Thesiastes debilis (originally Pselaphus debilis LeConte, 1878) and Thesiastes pumilis (originally Pselaphus pumilis LeConte, 1849).

Species diversity

Four are currently recognized: T. atratus Casey, 1894; T. debilis (LeConte, 1878); T. fossulatus (Brendel, 1891); and T. pumilis (LeConte, 1849). Additional undescribed species may exist given the cryptic nature of the group.