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Long-toed water beetles are named for their extended claws. Adults have dense hairs, which allow the beetles to breathe while underwater. The flight muscles of the females weaken as they age.
Despite being referred to as aquatic insects, the beetles are unable to swim, clinging to detritus that float. All long-toed water beetles feed on plants that are in the water, but the larvae also prey on small animals and most of them are terrestrial. Stygoparnus is the only genus in the family in which both the larvae and adults are aquatic.
Members of this family are found on every continent, except Antarctica and Australia, being more common in the tropics. In 2005, a possible fossilized specimen of Dryopidae was found in the Crato Formation by entomologists David Grimaldi and Michael S. Engel.
- Ahaggaria Bollow, 1938
- Ceradryops Hinton, 1937
- Drylichus Heller, 1916
- Dryops Olivier, 1791
- Elmomorphus Sharp, 1888
- Elmoparnus Sharp, 1882
- Geoparnus Besuchet, 1978
- Guaranius Spangler, 1991
- Helichus Erichson, 1847
- Holcodryops Spangler, 1987
- Malaiseianus Bollow, 1940
- Onopelmus Spangler, 1980
- Oreoparvus Delève, 1965
- Pelonomus Erichson, 1847
- Phallodryops Delève, 1973
- Postelichus Nelson, 1989
- Protoparnus Sharp, 1883
- Pseudopelonomus Brown, 1981
- Quadryops Perkins & Spangler, 1985
- Rapnus Grouvelle, 1899
- Sostea Pascoe, 1860
- Sosteamorphus Hinton, 1936
- Strina Redtenbacher, 1867
- Stygoparnus Barr & Spangler, 1992
- Uenodryops Satô, 1981
- Palaeoriohelmis Bollow, 1940
- Potamophilites Haupt, 1956
- "Dryopidae Billberg, 1820". Integrated Taxonomic Information System. Retrieved July 21, 2013.
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