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Amphizoa
''Amphizoa'' is a genus of adephagan aquatic beetles, placed in its own monogeneric family, Amphizoidae.〔(''Amphizoa'' LeConte 1853. ) Illinois Natural History Survey.〕 There are five known species of ''Amphizoa'', three in western North America and two in eastern palearctic.〔Nilsson, Anders N., and Bernhard J. van Vondel (2005) , World Catalogue of Insects. Volume 7: Amphizoidae, Aspidytidae, Haliplidae, Noteridae and Paelobiidae (Coleoptera, Adephaga)〕 They are sometimes referred to by the common name "troutstream beetles".〔
==Description==
Troutstream beetles have a characteristic appearance. They are relatively large, oval, slightly convex, dull black to piceus. Body length ranges between 11–16 mm (0.43-0.63 in). The head is broad with a quadrate shape and small round eyes. The antenna is filiform, rather short with 11 segments. Pronotum significantly narrower than the elytra and with lateral margins slightly crenulated; prosternal processes broad and flat, rounded to truncate at apex; elytra vaguely striate and ventroapically with a series of short spines of unknown function.〔Kavanaugh, David H. (1986) A systematic review of amphizoid beetles (Amphizoidae: Coleoptera) and their phylogenetic relationships to other Adephaga, Proceedings of the California Academy of Sciences, vol. 44, no. 6〕 The legs are not well adapted for swimming, and lack long swimming setae; hind coxae extending to lateral margin of abdomen; tarsal formula is 5-5-5.〔 〔Dettner, K. 2005: 7.4. Amphizoidae LeConte, 1853. Pp. 81-85 in: Beutel, R.G.; Leschen, R.A.B. (volume eds.) Coleoptera, beetles. Volume 1: Morphology and systematics (Archostemata, Adephaga, Myxophaga, Polyphaga partim). In: Kristensen, N.P. & Beutel, R.G. (eds.) Handbook of zoology. A natural history of the phyla of the animal kingdom. Volume IV. Arthropoda: Insecta. Part 38. Berlin, New York: Walter de Gruyter.〕
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