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Family Psephenidae - Water Penny Beetles

water penny beetle - Psephenus herricki 6007833 - Ectopria Water Penny Beetle larva - Ectopria 8015829 - Ectopria Water Penny Beetle - Ectopria Water penny - Psephenus herricki Eubrianax edwardsii (LeConte) - Eubrianax edwardsii Ectopria sp. - Ectopria
Classification
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 Psephenidae (Water Penny Beetles)
Synonyms and other taxonomic changes
Psephenidae Lacordaire 1854
Explanation of Names
Water penny: larvae are flat, often circular, and live in water
Psephenidae is from the name of the genus Psephanus
Numbers
16 spp. in 6 genera in our area(1)
Size
3-7 mm(1)
Identification
Adults flattened, usually dark:

Larvae aquatic, more often found than adults; they have a distinctive flattened form and cling to rocks:
Range
worldwide, most diverse in E. Asia; Eubrianacinae (represented in our area by Eubrianax) are circumpacific, Psepheninae (represented in our area by Psephenus) are primarily a New World group, and Eubriinae (the rest of our genera) are globally distributed(1)
Habitat
Larvae on the underside of rocks of submerged wood in fast-flowing water. Adults on rocks and vegetation along streams.
Season
Adults only in summer(1)
Food
Larvae graze on algae; some are detritivorous(1). Adults are short-lived and perhaps(?) feed little.
Life Cycle
semivoltine; larvae overwinter, pupate under riparian substrates or in water(1)
Print References
(2)
Internet References
Family page, by G. Hammond
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.Water Beetles of South Carolina
Janet Ciegler. 2003. Clemson University.