Backward-pointing ventral keel/spine(2)
much of NA(1)
; T. ellipticus
occurs throughout the western states (2)
, T. lateralis
commonly from Canada to FL, and west to the Rockies(5)
One of the first hydrophilids to be found in newly formed bodies of water, such as buckets, washtubs, etc.
Adults: algae, detritus, animal remains; larvae may be important predators of mosquito larvae in CA rice fields(2)
Spangler P.J. (1960) A revision of the genus Tropisternus (Coleoptera: Hydrophilidae) Unpubl. Ph.D. thesis. University of Missouri, Columbia. 365 pp.