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Iteration of ligament structures in pteriomorphian bivalves. American Museum novitates ; no. 2875

Show simple item record Newell, Norman Dennis, 1909- en_US Boyd, Donald Wilkin. en_US 2005-10-06T18:09:45Z 2005-10-06T18:09:45Z 1987 en_US
dc.description 11 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 10-11). en_US
dc.description.abstract "Pteriomorphia, the largest subclass of the Bivalvia, includes such highly successful extant groups as the marine mussels, pearl shells, oysters, and scallops. Shells of different groups display surprisingly diverse structural types of ligaments (diagnostic traces of which are recognizable in fossils as old as the early Cambrian) and the ligaments have figured prominently in pteriomorph classifications. Within the context of general morphology, seven or eight ligament grades have been used to characterize families of pteriomorphs. But the same, or very similar, ligaments appear repeatedly as evolutionary novelties in separate taxonomic groups without evident phyletic origins or marked adaptive significance. Even their phylogenetic polarity is frequently in doubt. For example, one complex structure (duplivincular) is replaced geochronologically by a different, and simpler structure (alivincular) in families of the Arcacea, Anomiacea, Aviculopectinacea, and Pteriacea. 'Transitional' (new term), multivincular, and duplivincular ligaments all occur in the superfamily Pteriacea. Even where the geological succession of ligaments might be interpreted as indicating an ancestral-descendant relationship, the different grades of ligaments do not form gradational morphoclines. So this review is intended only to call attention to taxonomic and phylogenetic difficulties in evaluating ligament grades; we are withholding conclusions about classification until later"--P. [1]. en_US
dc.format.extent 3156561 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. 2875 en_US
dc.subject.lcc QL1 .A436 no.2875, 1987 en_US
dc.subject.lcsh Pteriomorphia -- Anatomy. en_US
dc.subject.lcsh Ligaments. en_US
dc.subject.lcsh Bivalvia -- Anatomy. en_US
dc.subject.lcsh Bivalvia, Fossil. en_US
dc.subject.lcsh Bivalvia -- Evolution. en_US
dc.subject.lcsh Mollusks -- Anatomy. en_US
dc.title Iteration of ligament structures in pteriomorphian bivalves. American Museum novitates ; no. 2875 en_US
dc.title.alternative Ligament structures in Pteriomorphia 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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