Ochthephilus biimpressus
(Mäklin, 1852)
spiny-legged rove beetle
Ochthephilus biimpressus is a of spiny-legged rove beetle in the Staphylinidae, first described by Mäklin in 1852. It is a small rove beetle with characteristic short that leave most of the exposed, a defining trait of its family. The species is distributed across western North America from Alaska to California and eastward to Colorado and Montana.
Pronunciation
How to pronounce Ochthephilus biimpressus: /ɒkˈθɛfɪləs baɪɪmˈprɛsəs/
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Identification
As a member of Staphylinidae, this exhibits the 's diagnostic short covering only the portion of the , leaving six to seven abdominal segments visible. The Ochthephilus belongs to the spiny-legged rove beetles (Oxytelinae), characterized by spinose tibiae and adapted for digging. Specific identification to species level requires examination of male genitalia and detailed ; the specific epithet 'biimpressus' likely refers to two impressed (depressed or punctured) markings on the pronotum or elytra.
Distribution
Western North America: Canada (Alberta, British Columbia), United States (Alaska, California, Colorado, Montana, Oregon, Washington).
Similar Taxa
- Other Ochthephilus speciesCongeneric share the spiny-legged and short ; require dissection and comparison of and patterns for definitive separation.
- Other Oxytelinae genera (e.g., Thinobius, Bledius)Share the spiny-legged for burrowing in soil or organic substrates; differ in body proportions, antennal structure, and details of tibial spine arrangement.
More Details
Nomenclatural history
Originally described as Phloeonaeus biimpressus by Mäklin in 1852, later transferred to the Ochthephilus. The basionym is recorded in NCBI .
Observation rarity
Only 3 observations recorded in iNaturalist as of source date, suggesting either genuine rarity, cryptic habits, or undercollecting due to small size and soil-dwelling typical of the tribe Thinobiini.