Pterostichus lama
Ménétriés, 1843
giant woodland ground beetle
Pterostichus lama is a large, flightless ground beetle native to western North America. measure 15–29 mm and are uniformly black with strong . The inhabits woodland environments and has been documented feeding on and ants. It occurs in California, Nevada, Oregon, Washington, and British Columbia.
Pronunciation
How to pronounce Pterostichus lama: /tɛˈrɒstɪkəs ˈlɑːmə/
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Identification
Distinguished from other Pterostichus by its large size (15–29 mm), flightless condition, and western North American distribution. The combination of robust black body, reduced wings, and strong separates it from smaller or winged . Final identification requires examination of male genitalia or expert confirmation.
Images
Appearance
Large, robust with uniformly black coloration. Body length ranges from 15 to 29 mm. Possesses strong, well-developed . Wings are reduced or absent, rendering the flightless. Typical ground beetle with hardened covering the .
Habitat
Woodland environments in western North America. Specific microhabitat preferences are not well documented, but the is associated with forest floor conditions typical of ground beetles.
Distribution
Western North America: California, Nevada, Oregon, and Washington in the United States; British Columbia in Canada.
Diet
and ants.
Behavior
Flightless, moving by . activity pattern inferred from characteristics but not directly documented for this .
Ecological Role
of soil-dwelling insects, particularly and ants. Contributes to of these social insects in woodland .
Similar Taxa
- Other Pterostichus speciesP. lama is distinguished by its larger size (15–29 mm versus typically smaller), flightless condition, and western North American range.
More Details
Taxonomic authority
Described by Édouard Ménétriés in 1843.