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Family Elmidae - Riffle Beetles

elmid species 2 - Stenelmis crenata elmid species 2 - Stenelmis crenata elmid species 3 - Dubiraphia Macronychus glabratus Riffle Beetle - Stenelmis crenata Canterbury River elmid - Macronychus glabratus Comal Springs Riffle Beetle - Heterelmis comalensis Riffle beetle
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles)
Superfamily Byrrhoidea (Pill, Water and Toe-winged Beetles)
Family Elmidae (Riffle Beetles)
Explanation of Names
Family name based on genus Elmis Latreille, 1802.
A reference to Saint Elmo, patron saint of sailors, for their aquatic associations? Seems unlikely to be connected to the tree, Elm (Ulmus). The usual sources, such as The Century Dictionary (1), do not give an etymology.
Print References
The Century Dictionary, entries for Elmis, Elmidae (1)
American Beetles, Vol. 2, Chapter 43 (2)