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Genus Hydrocanthus

Burrowing Water Beetle - Hydrocanthus iricolor Burrowing Water Beetle - Hydrocanthus iricolor Noterid - Hydrocanthus Hydrocanthus - Hydrocanthus atripennis Dytiscid - Hydrocanthus iricolor smooth-as-glass beetle(?) - Hydrocanthus Burrowing Water Beetle - Hydrocanthus iricolor tiny aquatic critter - Hydrocanthus iricolor
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga
Family Noteridae (Burrowing Water Beetles)
Genus Hydrocanthus
Explanation of Names
Hydrocanthus Say 1823
Numbers
5-6 spp. in 2 subgenera in our area(1)(2), >50 total(3)
Identification
See (4)(2)(5)
Range
e. N. Amer. to S. Amer. / W. Indies - Map (1)(2)(6)(GBIF)
Remarks
The Illinois Natural History Survey website, citing several articles from the primary literature on this genus, indicates that we can assume Hydrocanthus in the northeast (roughly from Maryland north, and east of the Appalachians) to be H. iricolor until proven otherwise. The distributions (north of Mexico) of each species as given there:

H. iricolor - Eastern North America from Maine and Ontario to Michigan, northern Indiana, and south to South Carolina and Georgia
H. atripennis - southern Canada west of the Appalachians ... north to southern Illinois and southern Indiana; rare eastward in Florida ... north to the Carolinas
H. oblongus - Gulf and Atlantic coastal plains from Texas to the Carolinas
H. regius - Florida and Georgia
H. debilis - Texas
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.The Water Beetles of Florida
Epler J.H. 2010. Florida Department of Environmental Protection. Tallahassee. 414 pp.
3.Nilsson A.N. (2006) A world catalogue of the family Noteridae, or the burrowing water beetles (Coleoptera, Adephaga)
4.A key to the American species of Hydrocanthus with descriptions of new taxa (Coleoptera: Noteridae)
Frank N. Young. 1985. Proceedings of the Academy of Natural Sciences of Philadelphia, 137(1): 90-98.
5.Water Beetles of South Carolina
Janet Ciegler. 2003. Clemson University.
6.Bousquet Y., ed. (1991) Checklist of the beetles of Canada and Alaska