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Genus Cybister

Bug ID - Cybister Predaceous Diving Beetle - Cybister fimbriolatus Beetle IMG_0891 - Cybister fimbriolatus dytiscid larva - Cybister Large Diving Beetle - Cybister fimbriolatus Cybister fimbriolatus - ? - Cybister fimbriolatus Beetle? - Cybister fimbriolatus Cybister fimbriolatus? - Cybister fimbriolatus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Dytiscidae (Predaceous Diving Beetles)
Subfamily Dytiscinae
Tribe Cybistrini
Genus Cybister
Explanation of Names
Cybister Curtis 1827
Greek cybister 'diver'
Numbers
3 spp. in our area(1), ~80 total(2)
This genus is more diverse in the tropics.
Size
our spp.: adults 26-34 mm, larvae up to ~80 mm
Identification
key to spp. in(1)
Large water beetles. Hind legs broad. Metatarsal claws unequal, inner one smaller, sometimes absent. Metatarsi have fringe on outer margin, lacking in Dytiscus. Male has modified protarsus, used for grasping female during mating. Structure differs in Dytiscus. Larvae very large, with a frontal "tooth" on the head, and no cerci.
Range
by far most diverse in the Old World tropics(2); in our area, mainly so. US (only C. fimbriolatus reaches Canada); the range of this genus is considered complementary to that of Dytiscus, the latter being more common and diverse in northen latitudes(3)
in our area: C. fimbriolatus se. Canada to FL & so.CA; C. explanatus OR-CA-NV, C. occidentalis extreme so.FL(1)
Habitat
In the deeper, more open portions of ponds/lakes; readily come to lights
Remarks
adults consumed as food in parts of Asia, Africa(4)(5)
Print References
(6)
Works Cited
1.Review of the genus Cybister Curtis, 1827 (Coleoptera: Dytiscidae: Dytiscinae: Cybistrini) in North America
Miller K.B. 2013. Col. Bull. 67: 401-410.
2.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.
3.Predaceous Diving Beetles (Coleoptera: Dytiscidae) of the Nearctic Region, with emphasis on the fauna of Canada and Alaska
D.J. Larson, Y. Alarie, and R.E. Roughley. 2001. NRC 43253.
4.The Water Beetles of Florida
Epler J.H. 2010. Florida Department of Environmental Protection. Tallahassee. 414 pp.
5.DeFoliart G.R. (2002) The human use of insects as a food resource: a bibliographic account in progress
6.Water Beetles of South Carolina
Janet Ciegler. 2003. Clemson University.