Boreus californicus

Packard, 1870

California Snow Scorpionfly

Boreus californicus is a flightless of to western North America. It is active on snow surfaces across a broad elevation gradient from valley grasslands to alpine areas above tree . The species exhibits a distinctive tied to snow cover, with mating occurring directly on snow surfaces. Surface activity has been documented at temperatures ranging from −5.0°C to 5.5°C, with pairs in copula observed between −0.5°C and 5.5°C.

Boreus californicus by no rights reserved, uploaded by Steve Wells. Used under a CC0 license.

Pronunciation

How to pronounce Boreus californicus: /ˈbɔːriəs ˌkælɪˈfɔːrnɪkəs/

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Habitat

Snow surfaces in valley grasslands, subalpine conifer forests, and alpine areas above tree . Elevation range 991–2850 m in western Montana.

Distribution

Western North America; documented in western Montana, USA across an elevation gradient of nearly 2000 m. GBIF records indicate presence in North America broadly.

Seasonality

Active on snow at low elevations (991–1500 m) from early November to early March; at high elevations (1800–2850 m) from early October to early January and late June. Likely active on snow in most months except mid- and late summer.

Behavior

Flightless. Mating occurs on snow surfaces, with pairs in copula documented at snow surface temperatures from −0.5°C to 5.5°C. Jumping mobility on snow facilitates mate searching and likely contributes to and reduced inbreeding.

More Details

Temperature tolerance

Snow surface activity documented from −5.0°C to 5.5°C; mating pairs found from −0.5°C to 5.5°C.

Mating phenology by elevation

Low elevation mating: November to late February. High elevation mating: late June. Subalpine and alpine likely support mating in early summer plus late autumn through spring due to persistent snow conditions.