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Genus Hydrophilus - Giant Water Scavenger Beetles

Water Beetle - Hydrophilus triangularis Hydrophilus species? - Hydrophilus triangularis Cybister fimbrulatus? - Hydrophilus triangularis Hydrophilus triangularis - Giant Black Water Beetle? - Hydrophilus triangularis Giant Black Water Beetle? - Hydrophilus triangularis - male Giant Black Water Beetle? - Hydrophilus triangularis - male Hydrophilus? - Hydrophilus ovatus Hydrophilus triangularis (Giant Black Water Beetle) - Hydrophilus triangularis
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Staphyliniformia)
Superfamily Hydrophiloidea (Water Scavenger and Clown Beetles)
Family Hydrophilidae (Water Scavenger Beetles)
Subfamily Hydrophilinae
Tribe Hydrophilini
Genus Hydrophilus (Giant Water Scavenger Beetles)
Explanation of Names
Hydrophilus Geoffroy 1762
Greek 'water-loving'
Numbers
3 spp. (in 2 subgenera) in our area(1); additional species may be expected in so. FL; 3 subgenera total(2)
Size
the largest members of the family, >30 mm (our spp. up to 40 mm, extralimital spp. up to ~50 mm)(2)(3)
Identification
key to spp. in Epler (2010)(2)
Range
widespread N. Amer. & Eurasia(1)(3)
Habitat
stagnant/slow waters; prefer deeper water (weedy ponds, deep drainage ditches)(2)
Life Cycle
Female deposits up to 140 yellow eggs in cocoon-like egg case with a "mast". Case is large, about 15 X 24 mm, and floats or is attached to an underwater object. Larvae aquatic, predatory? Pupation occurs in moist soil. Adults emerge in under two weeks and return to the water. There are one or two generations per year. Some adults overwinter on land, under leaf litter. Others may remain under ice of ponds and stay active all winter. Lifespan may exceed one year.
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.The Water Beetles of Florida
Epler J.H. 2010. Florida Department of Environmental Protection. Tallahassee. 414 pp.
3.Keys to the insects of the Far East of the USSR, Vol. 3. Coleoptera I
Lehr P.A., ed. 1989. Leningrad, Nauka Publishing House, 572 pp.