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Species Hydrophilus triangularis - Giant Black Water Beetle

Bug big big water beetle? - Hydrophilus triangularis unknown diving beetle? near temporary pool - Hydrophilus triangularis Hydrophilidae, lateral - Hydrophilus triangularis Greenish Predaceous Diving Beetle - Hydrophilus triangularis Giant Black Water Beetle? - Hydrophilus triangularis - male Hydrophilus triangularis Hydrophilus - Hydrophilus triangularis - male Hydrophilidae: Hydrophilus triangularis? - Hydrophilus triangularis
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 Hydrophilini
Genus Hydrophilus (Giant Water Scavenger Beetles)
Species triangularis (Giant Black Water Beetle)
Other Common Names
Giant Diving Scavenger Beetle, Giant Water Scavenger
Explanation of Names
Hydrophilus triangularis Say 1823
32-40 mm(1)
Similar to the usually smaller and less oblong H. (Dibolocelus) ovatus (which is more common southward), but the prosternum is undivided(1)
transcontinental (BC-QC to FL-CA), less common in the northwest(2)(3)
marshy lakes, weedy ponds, swales and streams; often found under parking lot lights(1)
Apr-Aug in SC
predator/herbivore (Moorhead et al. 1998)
Print References
Moorhead D.L., Hall D.L., Willig M.R. (1998) Succession of macroinvertebrates in playas of the southern High Plains, USA. JNABS 17: 430-442.
Works Cited
1.The Water Beetles of Florida
Epler J.H. 2010. Florida Department of Environmental Protection. Tallahassee. 414 pp.
2.A Distributional Checklist of the Beetles (Coleoptera) of Florida
3.Review of the Family Hydrophilidae of Canada and Alaska
Ales Smetana. 1988. Entomological Society of Canada.