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Priscacara
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Priscacara : ウィキペディア英語版
Priscacara

''Priscacara'' is an extinct genus of perch from the middle Eocene. It is characterized by a sunfish-like body and its stout dorsal and anal spines.〔Grande, L. (1984). Paleontology of the Green River Formation, with a review of the fish fauna. Geological Survey of Wyoming Bulletin 63: 1-333〕 The fish is best known from the Green River Shales of Wyoming, Utah and Colorado. Mass deaths of ''Priscacara'' suggest it formed schools().
Two species are recognized,〔Whitlock, J. A. (2010). Phylogenetic relationships of the Eocene percomorph fishes ''Priscacara'' and ''Mioplosus''. Journal of Vertebrate Paleontology, 30(4), 1037-1048.〕 of which the smaller species, ''P. liops'' is the most common. ''Priscacara'' fossils are common in the Fossil Lake deposits of western-most Wyoming and is rare in the Lake Gossiute deposits of Wyoming and the Lake Uinta deposits of Utah and Colorado(). It also occurs in the middle Eocene lake deposits of Washington and British Columbia().
A phylogenetic review of ''Priscacara'' by Whitock(), found only two species, ''P. serrata'' and ''P. liops''. The two species differ in the number of dorsal and anal fin rays, as well as possibly a coarser serrated rear edge of the preopercle in ''P. serrata''(),. ''P. liops'' also has small conical teeth on the pharyngeal jaw, whereas ''P. serrata'' has large grinding toothplates(), suggesting a diet of snails and crustaceans().
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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