Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
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Family Elmidae - Riffle Beetles

Stenelmis crenata Riffle Beetle - Stenelmis sinuata Stenelmis Narpus concolor Stenelmis sp.? - Stenelmis crenata Atractelmis wawona Stenelmis mera? - Stenelmis larva - Promoresia tardella
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
Superfamily Byrrhoidea (Pill, Water and Toe-winged Beetles)
Family Elmidae (Riffle Beetles)
Explanation of Names
Elmidae Curtis 1830
ca. 100 spp. in 26 genera in our area; NA fauna is relatively well-known(1)(2); ~1500 spp. in ~150 genera worldwide(3)
Overview of our faunaTaxa not yet in the guide are marked (*)
Subfamily Elminae
Subfamily Larainae
keys to genera based on adult and larval characters in(4)
worldwide and throughout NA(1)
larvae and most adults aquatic; usually live in rapid cool streams(1); "the most truly aquatic of our water beetles"(5)
adults and larvae can be found year-round(1)
decayed plant material, algae(5)
Print References
Burke H.R. (1963) Notes on Texas riffle beetles (Coleoptera: Elmidae). Southwestern Nat. 8(2): 111-114.
Works Cited
1.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
2.Aquatic dryopoid beetles (Coleoptera) of the United States
Brown H.P. 1972. USEPA Water Poll. Control Res. Ser., Vol. 6. ix+82 pp.
3.Order Coleoptera Linnaeus, 1758. In: Zhang Z.-Q. (ed.) Animal biodiversity: An outline of higher-level classification...
Slipinski S.A., Leschen R.A.B., Lawrence J.F. 2011. Zootaxa 3148: 203–208.
4.Aquatic Insects of North America
R. W. Merritt, K. W. Cummins, M.B. Berg. 2008. Kendall/Hunt.
5.The Water Beetles of Florida
Epler J.H. 2010. Florida Department of Environmental Protection. Tallahassee. 414 pp.