Redescription of Upper Devonian conodont genera and species proposed by Ulrich and Bassler in 1926
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Abstract
The publication of "A classification of the toothlike fossils, conodonts, with descriptions of American Devonian and Mississippian species" by E. O. Ulrich and R. S. Bassler in 1926 lead to the recognition of the stratigraphic usefulness of conodonts and encouraged the study of conodonts by American paleontologists.This classic paper described many species which have a worldwide distribution.Many of Ulrich and Bassler's species need revision and reillustration because later conodont studies showed the importance of some characters not mentioned by Ulrich and Bassler.In addition, the type specimens were not completely exposed when originally photographed.The types have been prepared by W. H. Hass and me and are here redescribed and reillustrated.The specimens came from the Devonian Rhinestreet Shale Member of the West Falls Formation of New York, the Devonian Gassaway Member of the Chattanooga Shale of Alabama, and the Mississippian(?)"Hardin sandstone" of Tennessee.Many of the original Ulrich and Bassler species are placed in synonymy.Forty-four species described by Ulrich and Bassler are considered valid and distinct, and there are 23 species whose names are valid but the species are unrecognizable.Panderodella is considered a nomen dubium.
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