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Genus Berosus

Berosus unknown beetle, possibly aquatic - Berosus unknown beetle, NJ - Berosus Oregon Aquatic Beetle - Berosus Berosus miles LeConte - Berosus miles Black-spotted pale beetle - Berosus Scarab - Berosus Berosus hatchi - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Staphyliniformia)
Superfamily Hydrophiloidea
Family Hydrophilidae (Water Scavenger Beetles)
Subfamily Hydrophilinae
Tribe Berosini
Genus Berosus
Explanation of Names
Berosus Leach 1817
Numbers
17 spp. in our area(1), 6 in Canada(2), >260 worldwide
Identification
Adult: lateral outline of pronotum forms discontinuous line with elytra; pronotum and elytra with dark marks or spots; 2nd and 3rd pair of legs with swimming hairs on tibia; ventral surface relatively smooth between legs, lacking long keel or spine(3); shape of elytral apices important for species determination
Larva: light brown with darker brown markings; body elongate, with pointed tail and long lateral filamentous gills on abdomen
Range
most of the world and NA, including the arctic
Habitat
among submergent vegetation in ponds or edges of slow-moving portions of streams; adults come to light
Season
larvae present in spring; adults present year-round in water that doesn't freeze
Food
larvae prey on small aquatic invertebrates
Remarks
adults are unusual in that they can breath underwater, absorbing oxygen from the water through their body surface(3)
Internet References
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.Checklist of beetles (Coleoptera) of Canada and Alaska. Second edition
Bousquet Y., Bouchard P., Davies A.E., Sikes D.S. 2013. ZooKeys 360: 1–402.
3.Digital key to aquatic insects of North Dakota