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

Family Haliplidae - Crawling Water Beetles

crawling water beetle - Haliplus Haliplus triopsis Peltodytes #2 - Peltodytes Peltodytes Peltodytes edentulus? - Peltodytes edentulus Light colored water beetle with black spots - Peltodytes litoralis Peltodytes callosus? - Peltodytes callosus Peltodytes edentulus? - Peltodytes edentulus
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)
Explanation of Names
Haliplidae Aubé 1836
Numbers
~70 spp. in 4 genera in our area, ~220 spp. in 5 genera total(1)(2)
Size
1.5-5 mm(1)
Identification
modern key to e Canada spp in (3)
Range
worldwide, primarily Holarctic(3)(1)
Habitat
aquatic, prefer 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 (Beutel et al. 2011)
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.
2.Order Coleoptera Linnaeus, 1758. In: Zhang Z.-Q. (ed.) Animal biodiversity: An outline of higher-level classification...
Ślipiński S.A., Leschen R.A.B., Lawrence J.F. 2011. Zootaxa 3148: 203–208.
3.Haliplidae of Eastern Canada
H.V. Ashbee, S.A. Marshall, Y. Alarie. Canadian Journal of Arthropod Identification 32: 1-80, 2017.