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Cranial morphology of the fossil elasmobranch Synechodus dubrisiensis

by: Maisey, John G

Publication date: 1985

Topics: Synechodus dubrisiensis, Skull, Anatomy, Chondrichthyes, Fossil, Fishes, Fossil, Paleontology, Skull -- Anatomy, Paleontology -- Cretaceous

Publisher: New York, N.Y. : American Museum of Natural History

Collection: americanmuseumnaturalhistory; biodiversity

Contributor: American Museum of Natural History Library

Language: English

Rights: http://biodiversitylibrary.org/permissions

Rights-holder: American Museum of Natural History Library

Volume: no. 2804

28 p. : 26 cm

"The neurocranium of Synechodus dubrisiensis, a late Cretaceous elasmobranch, is described for the first time. Several similarities in the ethmoidal and otico-occipital regions of Synechodus and Recent elasmobranchs contrast sharply with conditions found in other fossil sharks, including Hybodus. The neurocrania of Synechodus and Hybodus are profoundly different. Similarities between Synechodus and various groups of Recent elasmobranchs suggest two alternative hypotheses of relationship. In one, Synechodus is a sister taxon to all Recent sharks and rays. In the other, Synechodus would be closely allied to galeomorphs (orectolobids, chiloscyllids, and galeoids) and to Heterodontus. Synechodus and Heterodontus are most parsimoniously regarded as successive sister-groups to galeomorphs"--P. [1]

Title from caption

"January 30, 1985."

Includes bibliographical references (p. 25-28)

Abstract: 'The neurocranium of Synechodus dubrisiensis, a late Cretaceous elasmobranch, is described for the first time. Several similarities in the ethmoidal and otico-occipital regions of Synechodus and Recent elasmobranchs contrast sharply with conditions found in other fossil sharks, including Hybodus. The neurocrania of Synechodus and Hybodus are profoundly different. Similarities between Synechodus and various groups of Recent elasmobranchs suggest two alternative hypotheses of relationship. In one, Synechodus is a sister taxon to all Recent sharks and rays. In the other, Synechodus would be closely allied to galeomorphs (orectolobids, chiloscyllids, and galeoids) and to Heterodontus. Synechodus and Heterodontus are most parsimoniously regarded as successive sister-groups to galeomorphs'--P. [1].