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The second ural centrum in Siluriformes and its implication for the monophyly of superfamily Sisoroidea (Teleostei, Ostariophysi). American Museum novitates ; no. 3437

Show simple item record Pinna, Mário C. C. de. en_US Ng, Heok Hee. en_US 2005-10-06T16:38:49Z 2005-10-06T16:38:49Z 2004 en_US
dc.description 23 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 15-17). en_US
dc.description.abstract "A well-developed second ural half-centrum is a peculiar characteristic of the caudal skeleton of certain siluriforms, not seen in other Recent ostariophysans. Although the character has been previously recorded in the literature, its exact taxonomic distribution, structure, ontogeny, and phylogenetic meaning within siluriforms are not yet determined. In this paper, the degree of development of the second ural half-centrum is surveyed across the order. The ontogeny of the relevant axial structures in the posterior region of the vertebral column is reported in representative siluriform taxa. The condition where the second ural centrum is well formed and forms a complete intervertebral joint anteriorly with the compound caudal centrum is considered derived within siluriforms, a character state homoplastic with the primitive state in more distant teleostean outgroups. Various catfishes display that derived condition, which is informative about relationships at different levels within the group. The most inclusive of those clades is the superfamily Sisoroidea, including the families Amblycipitidae, Akysidae, Sisoridae, Erethistidae, and Aspredinidae. The placement of the neotropical Aspredinidae into an otherwise exclusively Asian clade has important biogeographical implications and the structure of the second ural centrum provides additional support to that hypothesis. Based on the currently available knowledge on the relationships among catfishes, a well-developed second ural centrum is hypothesized to be a result of six different events in siluriforms"--P. [1]. en_US
dc.format.extent 743537 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 3437 en_US
dc.subject.lcc QL1 .A436 no.3437, 2004 en_US
dc.subject.lcsh Catfishes -- Anatomy. en_US
dc.subject.lcsh Skeleton. en_US
dc.subject.lcsh Tail. en_US
dc.subject.lcsh Catfishes -- Phylogeny. en_US
dc.subject.lcsh Catfishes en_US
dc.title The second ural centrum in Siluriformes and its implication for the monophyly of superfamily Sisoroidea (Teleostei, Ostariophysi). American Museum novitates ; no. 3437 en_US
dc.title.alternative Ural centrum in Siluriformes 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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