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Family Psephenidae - Water Penny Beetles

Water Penny - Psephenus herricki water penny beetle - Psephenus herricki Water Penny Beetle - Psephenus herricki Water Penny Beetle - Psephenus herricki non-gilled Water Penny Beetle - Ectopria nervosa Ψ - Psephenus 8016534 - Psephenus Unknown Beetle - Ectopria nervosa
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
16 spp. in 6 genera in our area(1)
3-7 mm(1)
Adults flattened, usually dark:

Larvae aquatic, more often found than adults; they have a distinctive flattened form and cling to rocks:
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)
Larvae on the underside of rocks of submerged wood in fast-flowing water. Adults on rocks and vegetation along streams.
Adults only in summer(1)
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
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.