Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
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Fall Fund Drive


Genus Peltodytes

Crawling Water Beetle - Peltodytes edentulus Peltodytes Peltodytes Peltodytes sexmaculatus - male Peltodytes - Peltodytes edentulus Peltodytes - Peltodytes edentulus Peltodytes edentulus? - Peltodytes edentulus Two-toned beetle - Peltodytes
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Haliplidae (Crawling Water Beetles)
Genus Peltodytes
Synonyms and other taxonomic changes
our spp. are members of the subgen. Neopeltodytes Satô 1963(1)
Explanation of Names
Peltodytes Régimbart 1878
18 spp. in our area(2), ~30 spp. total(3); selected local faunas: 6 spp. in Canada(4), 00 in NC(5), 8 in FL(2), 2 in CA(6), TBA in NH(7), 6 in MI(8)
3-4 mm
adults have two black spots on posterior margin of pronotum (no such spots in Haliplus)(1)
Key to adults by W.U. Brigham
worldwide except Australia and S. America(3); most of NA(1)
usually in dense mats of vegetation and algae along the margins of ponds/lakes or slow-running waters, often in association with Haliplus(2)
adults: year-round; larvae: spring
larvae feed entirely on algae; adults feed on aquatic worms, small crustaceans, hydrozoans, midge eggs, and algae
Life Cycle
overwinters as an adult in permanent standing water
adults come to lights