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Studies on Carboniferous freshwater fishes. American Museum novitates ; no. 2641

Show simple item record Baird, Donald. en_US 2005-10-06T16:44:23Z 2005-10-06T16:44:23Z 1978 en_US
dc.description 22 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 20-22). en_US
dc.description.abstract "New material from Nova Scotia, Illinois, and Pennsylvania casts light on certain fish taxa and faunas found in freshwater deposits of the Pennsylvanian and latest Mississippian. The earliest representative of the palaeoniscoid family Haplolepidae is described as Haplolepis (Parahaplolepis) canadensis, a new species distinguished from H. tuberculata by the shape of its frontals and from H. anglica by their tuberculate structure. The presence of H. (P.) canadensis in the early Pennsylvanian (Westphalian A) of Nova Scotia implies a separation of the subgenus Parahaplolepis from the basal haplolepid stock in Mississippian time. The lungfish genus Ctenodus, hitherto extremely rare in North America, is in fact represented by its three European species, each in strata of appropriate age: the primitive C. interruptus in the latest Mississippian (Namurian A) of Nova Scotia, the intermediate C. cristatus in the middle Pennsylvanian (early Westphalian D) of Illinois, and the specialized C. murchisoni in the late Westphalian D of Nova Scotia. Ctenodus, Conchopoma, and Megapleuron constitute a highly anomalous lungfish assemblage in the Mazon Creek deposits of Illinois. Pennsylvanian records of the acanthodian genus Gyracanthus in the Western Hemisphere, previously limited to two specimens, can now be extended by Nova Scotian finds dating from the Namurian A and Westphalian A and B. An unexpectedly late survival of Gyracanthus into Westphalian D time is documented by spines from Illinois; Trichorhipis praecursor is reinterpreted as a prepectoral spine of Gyracanthus. The previously unreported fish fauna of the classic locality at Cannelton, Pennsylvania, comprises the coelacanth Rhabdoderma elegans, the crossopterygian Rhizodopsis cf. robustus, the palaeoniscoids Haplolepis aff. ovoidea and Elonichthys peltigerus and a third genus resembling Commentrya, and the sharks Xenacanthus compressus and Bandringa rayi. The latter genus is shown to be a ctenacanthoid derivable from Goodrichthys, and of freshwater rather than marine habitat"--P. [1]. en_US
dc.format.extent 10889169 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. 2641 en_US
dc.subject.lcsh Fishes, Fossil -- Nova Scotia. en_US
dc.subject.lcsh Fishes, Fossil -- Ohio River Watershed. en_US
dc.subject.lcsh Paleontology -- Carboniferous -- Nova Scotia. en_US
dc.subject.lcsh Paleontology -- Carboniferous -- Ohio River Watershed. en_US
dc.subject.lcsh Paleontology -- Nova Scotia. en_US
dc.subject.lcsh Paleontology -- Ohio River Watershed. en_US
dc.subject.lcsh Freshwater fishes -- Nova Scotia. en_US
dc.subject.lcsh Freshwater fishes -- Ohio River Watershed. en_US
dc.title Studies on Carboniferous freshwater fishes. American Museum novitates ; no. 2641 en_US
dc.title.alternative Carboniferous fishes 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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