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Family Haliplidae - Crawling Water Beetles

Haliplid - Peltodytes tortulosus Haliplus stagninus Leech - Haliplus stagninus Peltodytes sexmaculatus Roberts - Peltodytes sexmaculatus Water beetle 09.07.09 - Peltodytes dietrichi Haliplus robertsi (Zimmermann) - Haliplus robertsi Haliplus apicalis (Thomson) - Haliplus apicalis Crawling Water Beetle - Peltodytes edentulus Crawling Water Beetle - Haliplus
Classification
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)
Numbers
~70 spp. in 4 genera in our area, ~200 spp. in 5 genera worldwide(1)
Size
1.5-5 mm(1)
Identification
body convex dorsally, broadly oval or boat-shaped (with pointed posterior) and brownish or reddish-yellow with dark spots; hind coxae very long, flat, and broad, covering much of the ventral surface of the abdomen - but this feature is not visible in dorsal photos
Range
worldwide, more common in temperate regions(1)
Habitat
larvae and adults are aquatic, preferring standing water such as large ponds that have no shade and plentiful algae
Season
adults: year-round
larvae: spring
Food
larvae feed entirely on algae, either the filamentous forms such as Spirogyra, or macroalgae such as Chara
adults feed on oligochaet worms, small crustaceans, hydrozoans, the eggs of midges, and algae
Life Cycle
overwinters as an adult in permanent standing water
Remarks
adults periodically come to the water surface for air; atmospheric oxygen is captured in bubbles and stored in three places - under the wings, at the tail, and under the large coxal plates - allowing the beetle to breathe underwater for long periods
adults swim slowly and clumsily by "shuffling" (moving their legs alternately, rather than in unison like predaceous diving beetles do)
Internet References
family page by Beutel et al.
Works Cited
1.American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia
Arnett, R.H., Jr., and M. C. Thomas. (eds.). 2000. CRC Press LLC, Boca Raton, FL.