Carabus chamissonis

Fischer von Waldheim, 1820

Fisher's worm and slug hunter

Carabus chamissonis is a ground beetle restricted to tundra environments across northern North America. It occupies open, dry tundra with better drainage than those used by the related Carabus truncaticollis. The species exhibits brachyptery (reduced wings) and activity patterns. overwinter within their own pupal cavities, an unusual among ground beetles. Disjunct occur on isolated mountaintops in New England, far south of the main Arctic range.

Pronunciation

How to pronounce Carabus chamissonis: /ˈkaː.ra.bʊs ka.miˈsoː.nis/

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Identification

Brachypterous distinguished from sympatric Carabus truncaticollis by preference: C. chamissonis occupies drier, better-drained tundra sites. The isolated southern on Mount Washington (New Hampshire) and Katahdin (Maine) represent disjunct occurrences far from the main Arctic distribution.

Habitat

Open, dry tundra environments with well-drained soils. In the Arctic, occupies sites with superior drainage compared to those inhabited by Carabus truncaticollis. Southern disjunct occur on alpine tundra of isolated mountain summits.

Distribution

Northern Canada; Alaska; Greenland. Isolated relict on Mount Washington, New Hampshire and Mount Katahdin, Maine, USA.

Seasonality

active during summer months; overwinter in pupal cavities.

Life Cycle

overwinter within their own pupal cavities. Developmental details otherwise undocumented.

Behavior

activity pattern. brachypterous (flightless).

Ecological Role

Predatory ground beetle in tundra . Likely contributes to in northern .

Similar Taxa

  • Carabus truncaticollisOccupies wetter tundra in the Arctic; distinguished from C. chamissonis by microhabitat preference rather than

More Details

Overwintering behavior

within the pupal cavity is documented for this , representing an unusual trait among Carabidae.

Disjunct distribution

The New England mountaintop are geographic isolates separated from the main Arctic range by thousands of kilometers, suggesting relictual survival from colder climatic periods.

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Sources and further reading