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| Braincase of the Upper Devonian shark Cladodoides wildungensis (Chondrichthyes, Elasmobranchii), with observations on the braincase in early chondrichthyans. Bulletin of the AMNH ; no. 288 |
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| Title: | Braincase of the Upper Devonian shark Cladodoides wildungensis (Chondrichthyes, Elasmobranchii), with observations on the braincase in early chondrichthyans. Bulletin of the AMNH ; no. 288 |
| Other Titles: | Cranial morphology of Cladodoides |
| Authors: | Maisey, John G. |
| Issue Date: | 2005 |
| Publisher: | New York, NY : American Museum of Natural History |
| Series/Report no.: | Bulletin of the American Museum of Natural History ; no. 288 |
| Abstract: | "The braincase of an Upper Devonian shark (Cladodoides wildungensis) is investigated using high-resolution CT scanning, and its internal and external morphology is described from three-dimensional digital reconstructions. Many features are shared with modern elasmobranchs (neoselachians); these mostly represent conserved elasmobranch, chondrichthyan, or gnathostome characters. C. wildungensis resembles neoselachians in having a closed metotic fissure defining a glossopharyngeal canal, unlike some early chondrichthyans (e.g., Pucapampella, Orthacanthus) in which an open metotic fissure extends a considerable distance beneath the otic capsule. However, the glossopharyngeal canal in C. wildungensis is connected to a persistent dorsal fissure between the occipital arch and otic capsules, whereas this fissure becomes closed during neoselachian ontogeny. The embryonic polar cartilage apparently made a much greater contribution to the basicranium than in neoselachians and gnathostomes general... |
| Description: | 103 p. : ill. ; 26 cm. Includes bibliographical references (p. 98-103). |
| URI: | http://hdl.handle.net/2246/456 |
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