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

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dc.contributor.authorPinna, Mário C. C. de.en_US
dc.contributor.authorNg, Heok Hee.en_US
dc.date.accessioned2005-10-06T16:38:49Z
dc.date.available2005-10-06T16:38:49Z
dc.date.issued2004en_US
dc.description23 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 15-17).en_US
dc.description.abstractA 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.en_US
dc.format.extent743537 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/2802
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 3437en_US
dc.subject.lccQL1 .A436 no.3437 2004en_US
dc.subject.lcshCatfishes -- Anatomy.en_US
dc.subject.lcshSkeleton.en_US
dc.subject.lcshTail.en_US
dc.subject.lcshCatfishes -- Phylogeny.en_US
dc.subject.lcshCatfishesen_US
dc.titleThe second ural centrum in Siluriformes and its implication for the monophyly of superfamily Sisoroidea (Teleostei, Ostariophysi). American Museum novitates ; no. 3437en_US
dc.title.alternativeUral centrum in Siluriformesen_US
dc.typetexten_US

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