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Genus Haliplus

Haliplus stagninus Leech - Haliplus stagninus Haliplus - Haliplus immaculicollis Haliplus immaculicollis Haliplus triopsis Crawling Water Beetle - Haliplus Haliplus Water Scavenger Beetle  Maybe? - Haliplus Water Scavenger Beetle  Maybe? - 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)
Genus Haliplus
Explanation of Names
Haliplus Latreille, 1802
Numbers
45 spp. in our area(1); 26 spp. in Canada and Alaska(2)
Size
1.75-5 mm(3)
Identification
Adult: body convex, boat-shaped, with; middle and hind tibiae equipped with fringe of swimming hairs; legs move alternately while swimming (all are characteristics of the family); some species have a single black spot on anterior margin of pronotum (as opposed to two black spots on posterior margin of pronotum, as in Peltodytes species); species identification often requires examination of male genitalia
Larva: elongate, yellowish or brownish with small dorsal projections on first several abdominal segments, and long pointed caudal appendage
Range
throughout NA, including the arctic; worldwide except Antarctica
Habitat
adults and larvae live among algae and aquatic vegetation at edges of ponds, lakes, backwaters of streams; adults may be attracted to light
Season
adults year-round; larvae in spring
Food
larvae feed on algae, sucking the contents of single cells with their highly specialized mandibles
adults feed on algae, chironomid eggs, oligochaet worms, small crustaceans, and hydrozoans
Life Cycle
overwinters as an adult in permanent standing water
See Also
some adults in the genus Peltodytes have two small black spots on posterior margin of pronotum, whereas Haliplus lack these two spots [How to Know the Insects; Roger Bland, 1978]
Internet References
World and North American checklists plus global species numbers, classification history, references (Warren Brigham, U. of Illinois)