Details - Studies on the Paleozoic selachian genus Ctenacanthus Agassiz

Studies on the Paleozoic selachian genus Ctenacanthus Agassiz

Title

Studies on the Paleozoic selachian genus Ctenacanthus Agassiz. No. 2, Bythiacanthus St. John and Worthen, Amelacanthus, new genus, Eunemacanthus St. John and Worthen, Sphenacanthus Agassiz, and Wodnika MuМ€nster

Title Variants

Alternative: Bythiacanthus St. John and Worthen, Amelacanthus, new genus, Eunemacanthus St. John and Worthen, Sphenacanthus Agassiz, and Wodnika MuМ€nster

By

Maisey, John G.

Type

Book

Material

Published material

Publication info

New York, N.Y, American Museum of Natural History, c1982

Notes

Title from caption.

"January 29, 1982."

"Some of the finspines originally referred to Ctenacanthus are reassigned to other taxa. Several characteristically tuberculate lower Carboniferous finspines are referred to Bythiacanthus St. John and Worthen, including one of Agassiz's original species, Ctenacanthus brevis. Finspines referable to Bythiacanthus are known from western Europe, the U.S.S.R., and North America. Amelacanthus, new genus, is described on the basis of finspines from the United Kingdom. Four species are recognized, two of which were originally assigned to Onchus by Agassiz, and all four of which were referred to Ctenacanthus by Davis. Eunemacanthus St. John and Worthen is revised to include some European and North American species. Sphenacanthus Agassiz is shown to be a distinct taxon from Ctenacanthus Agassiz, on the basis of finspine morphology, and its widespread occurrence in the Carboniferous of North America is demonstrated. Similarities are noted between the finspines of Sphenacanthus and Wodnika, and both taxa are placed provisionally in the family Sphenacanthidae. A new species of Wodnika, W. borealis, is recognized on the basis of a finspine from the Permian of Alaska"--P. [1].