It was originally described by John Strong Newberry in 1856 as a new species of the palaeonisciform fish genus Pygopterus. In 1869, Edward Drinker Cope erected a new genus of "batrachian", Colosteus, containg the species C. crassicutatus, C. foveatus, and C. marshii, based on Linton material lent to him by Newberry. Cope later realized that the holotype of his Colosteus crassicutatus was also the holotype of Newberry's earlier Pygopterus scutellatus, and combined the two as Colosteus scutellatus. Colosteus foveatus was later determined to be a junior synonym of Isodectes obtusus, and Colosteus marshii was given its own genus, Ptyonius.
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| - It was originally described by John Strong Newberry in 1856 as a new species of the palaeonisciform fish genus Pygopterus. In 1869, Edward Drinker Cope erected a new genus of "batrachian", Colosteus, containg the species C. crassicutatus, C. foveatus, and C. marshii, based on Linton material lent to him by Newberry. Cope later realized that the holotype of his Colosteus crassicutatus was also the holotype of Newberry's earlier Pygopterus scutellatus, and combined the two as Colosteus scutellatus. Colosteus foveatus was later determined to be a junior synonym of Isodectes obtusus, and Colosteus marshii was given its own genus, Ptyonius.
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| - It was originally described by John Strong Newberry in 1856 as a new species of the palaeonisciform fish genus Pygopterus. In 1869, Edward Drinker Cope erected a new genus of "batrachian", Colosteus, containg the species C. crassicutatus, C. foveatus, and C. marshii, based on Linton material lent to him by Newberry. Cope later realized that the holotype of his Colosteus crassicutatus was also the holotype of Newberry's earlier Pygopterus scutellatus, and combined the two as Colosteus scutellatus. Colosteus foveatus was later determined to be a junior synonym of Isodectes obtusus, and Colosteus marshii was given its own genus, Ptyonius.
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