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For Insects, Spiders & Their Kin
For the United States & Canada
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Genus Cybister

A beetle out of water - Cybister fimbriolatus Predaceous Diving Beetle - Cybister fimbriolatus diving beetle - Cybister fimbriolatus Possible Cybister fimbriolatus? - Cybister fimbriolatus Cybister fimbriolatus Large dytiscid at lights - Cybister explanatus Cybister fimbriolatus (Say) - Cybister fimbriolatus - female Cybister fimbriolatus - male
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga
Family Dytiscidae (Predaceous Diving Beetles)
Subfamily Cybistrinae
Genus Cybister
Explanation of Names
Cybister Curtis 1827
Greek cybister 'diver'
3 spp. in our area(1), ~100 total(2)
our spp.: adults 26-34 mm, larvae up to ~80 mm
key to spp. in (1)
Hind legs broad. Metatarsal claws unequal, inner one smaller, sometimes absent. Metatarsi have fringe on outer margin, lacking in Dytiscus. Larvae with a frontal tooth on the head and no cerci.
by far most diverse in the Old World tropics(3); 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 norther latitudes(4)
in our area(1): C. fimbriolatus se. Canada to FL-CA; C. explanatus OR-CA-NV; C. occidentalis extreme so.FL
deeper, more open portions of ponds/lakes
adults consumed as food in parts of Asia, Africa(5)(6)
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