The Scissurellidae : are they neotenously derived fissurellids? (Archeogastropoda). American Museum novitates ; no. 2567

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dc.contributor.authorBatten, Roger Lyman.en_US
dc.date.accessioned2005-10-06T18:21:37Z
dc.date.available2005-10-06T18:21:37Z
dc.date.issued1975en_US
dc.description29 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 28-29).en_US
dc.description.abstract"Comparative anatomical studies have been made of the families Scissurellidae, Pleurotomariidae, and Fissurellidae. Shared primitive characters such as paired organs and shared derived characters like epipodial tentacles, indicate that the Scissurellidae should be removed from the Pleurotomariacea, despite nearly identical external morphology, and placed in the Fissurellacea. The only available pleurotomariaceans when the scissurellids appeared in early Cenozoic time are the haliotids and the Pleurotomariidae. Neither family has as many shared characters as the scissurellids and the fissurellids. A study of the ultrastructure of the scissurellids further justifies this decision. Ultrastructure normally is quite conservative in major taxa. The pleurotomarians have a complex prismatic-nacreous wall, whereas the scissurellids have a simple prismatic-'type-2 crossed-lamellar' wall. This latter wall type is found in the embryonic stage only of the fissurellids; in adults the wall is crossed-lamellar-crossed-lamellar. The early embryonic stages of the fissurellids are similar or nearly identical with all growth stages in the scissurellids. This observation suggests that the scissurellids might have been neotenously derived from the fissurellids. The scissurellids are remarkably convergent on several genera of the Upper Paleozoic Eotomariidae and the Triassic Temnotropidae in external morphology"--P. [1].en_US
dc.format.extent18874031 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/5456
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, Ny.Y. : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 2567en_US
dc.subject.lccQL1 .A436 no.2567, 1975en_US
dc.subject.lcshScissurellidae.en_US
dc.subject.lcshFissurellidae.en_US
dc.subject.lcshGastropoda -- Evolution.en_US
dc.subject.lcshNeoteny.en_US
dc.titleThe Scissurellidae : are they neotenously derived fissurellids? (Archeogastropoda). American Museum novitates ; no. 2567en_US
dc.typetexten_US

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