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Showing results for tags 'amyzon'.
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Taxonomy from Liu 2021. Diagnosis from Wilson 1977, p. 32: "Eocene Amyzon with body depth to standard length ratio 0.26 to 0.51; head length to standard length ratio 0.24 to 0.34; dorsal fin base length to standard length ratio 0.28 to 0.43; vertebrae 16-19 + 14-18; D 21-27; A 7-11; P 12-20; V 7-15; C i,8- (9),(7)-8-(9),i; scales maximum width to total length ratio 0.39 to 1.49, focus — basal margin to total length ratio 0.26 to 0.49, apical primary radii 2-14, apical secondary radii 0-22, basal primary radii 0-30, basal secondary radii 0-27, laterobasal corners mostly strong." Identified by oilshale. References: Grande, L., Eastman, J. & Cavender, T. (1982): Amyzon gosiutensis, a New Catostomid Fish from the Green River Formation. Copeia, 1982(3), 523-532. WILSON, M. V. H. (1977): Middle Eocene freshwater fishes from British Columbia. Life Sci. Contrib. Roy. Ontario Mus. 113, 1-61. Wilson, M. V. H. (1996) The Eocene fishes of Republic, Washington. Washington Geology, 24, 30–31. Liu, J. (2021) Redescription of ‘Amyzon’ brevipinne and remarks on North American Eocene catostomids (Cypriniformes: Catostomidae). JOURNAL OF SYSTEMATIC PALAEONTOLOGY2021, VOL. 19, NO. 9, 677-689. https://doi.org/10.1080/14772019.2021.1968966
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Amyzon is a Catostomid fish so far known from most of the Lake Gosiute localities but not in Fossil Lake deposits or Lake Unita deposits. Taxonomy from Mindat.org. Diagnosis from Grande et al. 1982, p. 524: "A species of Amyzon which differs from all others in having the following combination of characters: body depth 36 to 44%, head length 29 to 33% of standard length; 22 to 24 principal dorsal fin rays; 34 or 35 vertebrae (including Weberian complex); long pelvic splint (unsegmented bony ray) about 50% or more of fin length. Of the six previously described species of Amyzon, A. gosiutensis most closely resembles A. aggregatum Wilson (1977) from British Columbia. Meristic and morphometric data for these two species are presented in Table 1. Amyzon gosiutensis differs from A. aggregatum in having fewer dorsal fin rays, larger maxilla length/standard length ratio, and larger preanal length/standard length ratio." Line drawing from Grande et al. 1982, p. 524: Identified by oilshale using Grande et al. 1982. References: WILSON, M. V. H. (1977): Middle Eocene freshwater fishes from British Columbia. Life Sci. Contrib. Roy. Ontario Mus. 113, 1-61. Grande, L., Eastman, J. & Cavender, T. (1982): Amyzon gosiutensis, a New Catostomid Fish from the Green River Formation. Copeia, 1982(3), 523-532.
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- amyzon
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