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Genus Uvarus

Bidessus granarius - Uvarus granarius Dytiscid - Uvarus lacustris tiny Dytiscidae - Uvarus falli Diver #4 - Uvarus falli Uvarus subtilis (LeConte) - Uvarus subtilis Uvarus lacustris (Say) - Uvarus lacustris small Dytiscid - Uvarus falli - male Uvarus lacustris (Say) - Uvarus lacustris
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Dytiscidae (Predaceous Diving Beetles)
Subfamily Hydroporinae
Tribe Bidessini
Genus Uvarus
Synonyms and other taxonomic changes
there's much taxonomic confusion about this genus as presently defined(1)
9 spp. in our area, divided between two sp.-groups (granarius-group and lacustris-group)(2)
1.5-1.9 mm(1)
brown to black with contrasting yellowish-orange pattern; head orange or yellow
antennae filamentous
hind legs with fringe of swimming hairs
no transverse occipital line behind the eye(2)
pair of sublateral plicae (grooves) on the pronotum that reach the base and extend onto the elytral base (as in most Bidessini)(2)
North and Central America, Africa, Asia, and Australia(1); in our area, se. Canada and ne. US + BC [?and adjacent parts of nw. US]
among submergent vegetation in small temporary or permanent ponds, or edges of small, slow-moving streams
spring through fall
larvae and adults predaceous on other aquatic invertebrates
Life Cycle
Overwinters as an adult. One of the first aquatic insects to colonize new water bodies, such as stormwater retention ponds. Adults can fly long distances, making them effective dispersers.
Genus needs revision
Internet References
U. lacustris (adult image + info)
U. suburbanus (adult image + info)
Works Cited
1.American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia
Arnett, R.H., Jr., and M. C. Thomas. (eds.). 2000. CRC Press LLC, Boca Raton, FL.
2.Predaceous Diving Beetles (Coleoptera: Dytiscidae) of the Nearctic Region, with emphasis on the fauna of Canada and Alaska
D.J. Larson, Y. Alarie, and R.E. Roughley. 2001. NRC 43253.