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Cranial anatomy of the Lower Jurassic shark Hybodus reticulatus (Chondrichthyes, Elasmobranchii) : with comments on hybodontid systematics / John G. Maisey. American Museum novitates ; no. 2878

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dc.contributor.author Maisey, John G. en_US
dc.date.accessioned 2005-10-06T18:09:31Z
dc.date.available 2005-10-06T18:09:31Z
dc.date.issued 1987 en_US
dc.identifier.uri http://hdl.handle.net/2246/5208
dc.description 39 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 36-39). en_US
dc.description.abstract "Hybodus reticulatus Agassiz, from the Lower Jurassic of England, is considered to be the type species of Hybodus. It is founded on skeletal fragments and associated teeth. The cranial anatomy is described from several incomplete specimens, including some of the type material. Two specimens from the Upper Lias of Germany are referred to H. cf reticulatus. Comparisons are made with the Lower Cretaceous Hybodus basanus, whose cranial morphology is more completely known. The neurocranium and jaws are similar in these species, suggesting that many of the anatomical peculiarities noted in the ethmoid and otico-occipital regions of H. basanus characterize a larger group of hybodontid sharks, including the type species of Hybodus. Some differences are noted in the detailed arrangement of the lateral otic process, cephalic spines, and ethmopalatine articulation in H. reticulatus and H. basanus. These differences are considered to be of systematic importance; H. basanus and H. fraasi are placed in a new genus, Egertonodus, on the basis of several differences from H. reticulatus. The genus Hybodus remains an assemblage of nominal species, but increased anatomical data will gradually alleviate this situation. A list of genera retained within the Hybodontidae is given. Hybodontid tooth histology is reviewed, and forms the basis of a phylogenetic hypothesis which is open to falsification by other anatomical data"--P. [1]. en_US
dc.format.extent 11495392 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, N.Y. : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 2878 en_US
dc.subject.lcc QL1 .A436 no.2878, 1987 en_US
dc.subject.lcsh Hybodus reticulatus. en_US
dc.subject.lcsh Skull -- Anatomy. en_US
dc.subject.lcsh Hybodontidae. en_US
dc.subject.lcsh Sharks, Fossil -- England. en_US
dc.subject.lcsh Fishes, Fossil -- England. en_US
dc.subject.lcsh Paleontology -- Jurassic -- England. en_US
dc.subject.lcsh Paleontology -- England. en_US
dc.subject.lcsh Sharks -- Anatomy. en_US
dc.title Cranial anatomy of the Lower Jurassic shark Hybodus reticulatus (Chondrichthyes, Elasmobranchii) : with comments on hybodontid systematics / John G. Maisey. American Museum novitates ; no. 2878 en_US
dc.title.alternative Cranial anatomy of Hybodus reticulatus en_US
dc.type text en_US


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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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