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Genus Colymbetes

Predacious Diving Beetle? - Colymbetes paykulli Water Beetle Larva? - Colymbetes Colymbetes dolabratus Dytiscidae - Colymbetes Water Beetle - Colymbetes Predaceous Diving Beetle - Colymbetes paykulli Colymbetes sculptilis? - Colymbetes dytiscid - Colymbetes
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 Colymbetinae
Tribe Colymbetini
Genus Colymbetes
Synonyms and other taxonomic changes
Colymbetes Clairville (1806)
Explanation of Names
Greek kolymbetes (κολβητης) 'diver'(1)
9 spp. in our area (20 total); 7 in Canada(2)
11-20 mm
Eyes notched at antennal bases
Elytral sculpture consists of numerous transverse parallel grooves (separates from Rhantus and Neoscutopterus) (2)
Colour: completely black to yellow-brown, pronotum may have spots and/or transverse medial bar.
Photos showing some of these characters:

Head with no frontal horn
Sparse to no swimming hairs on abdominal segments 7 and 8
cerci/urogomphi with shorter secondary hairs in addition to 2 main whorls of hairs; with few to no short spine-like setae (separates from Rhantus)
4th antennal segment subequal in length to 3rd antennal segment
Photos of larva illustrating some of these characters:
holarctic; throughout NA(2), more diverse in the north and west
standing water, generally among emergent vegetation(2)
predaceous on other aquatic life
Works Cited
1.Dictionary of Word Roots and Combining Forms
Donald J. Borror. 1960. Mayfield Publishing Company.
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.