Tanystoma maculicolle
(Dejean, 1828)
Tule Beetle, Overflow Bug, Grease Bug
Tanystoma maculicolle is a ground beetle (Carabidae) native to the Pacific coast of North America. It is described as 'extremely common' in its range and is especially abundant in California's Central Valley agricultural regions. The is notable for its habit of entering human structures, earning it the 'overflow ' and 'grease bug' alongside 'tule '.
Pronunciation
How to pronounce Tanystoma maculicolle: /ˌtænɪˈstoʊmə ˌmækjʊˈkɒli/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
No specific diagnostic features documented for distinguishing this from .
Images
Habitat
Agricultural areas, particularly in California's Central Valley; associated with wetland-edge vegetation implied by 'tule ' (tule being a marsh plant).
Distribution
Southern Oregon and much of California, USA.
Behavior
Has been observed entering homes, particularly in agricultural regions.
Human Relevance
Considered a nuisance pest in agricultural areas of California's Central Valley due to home invasions; familiar presence to residents in these regions.
More Details
Common Name Origins
The name 'tule ' references association with tule (Schoenoplectus spp.), a marsh plant. 'Overflow ' and 'grease bug' likely refer to its habit of appearing in large numbers during flooding or irrigation events and its attraction to greasy surfaces or food residues in homes.