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1 April 2015 Ischyodus rayhaasi (Chimaeroidei; Callorhynchidae) from the Campanian-Maastrichtian Fox Hills Formation of Northeastern Colorado, USA
John W. Hoganson, J. Mark Erickson, Michael J. Everhart
Author Affiliations +
Abstract

Modern ratfish (chimaeroids) are examples of a poorly documented lineage of cartilaginous fishes that extends back to Triassic time. Here we report on the discovery of abundant remains of the callorhynchid chimaeroid Ischyodus rayhaasi Hoganson and Erickson 2005 from a Campanian-Maastrichtian age locality in the Fox Hills Formation of northeastern Colorado. A second, distinct group of chimaeroid specimens, designated Ischyodus sp., occurs at the same locality and may represent a species separate from I. rayhaasi, an earlier ontogenetic stage, or sexual dimorphism within I. rayhaasi. The presence of chimaeroid fishes is discussed in regard to the paleoecology and paleogeography of the Late Cretaceous Western Interior Seaway.

John W. Hoganson, J. Mark Erickson, and Michael J. Everhart "Ischyodus rayhaasi (Chimaeroidei; Callorhynchidae) from the Campanian-Maastrichtian Fox Hills Formation of Northeastern Colorado, USA," Transactions of the Kansas Academy of Science 118(1-2), 27-40, (1 April 2015). https://doi.org/10.1660/062.118.0104
Published: 1 April 2015
KEYWORDS
Chimaeriformes
Chondrichthyes
fauna
ratfish
Western Interior Seaway
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