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Abstract:

Vertebrate remains from the Late Albian–Early Cenomanian Candeleros Formation of northwestern Patagonia include those of a pipoid frog, which is described herein. The fossils consist of partially articulated and disarticulated elements, some of them badly broken, that are mostly exposed in ventral aspect. The description is based on one incomplete skeleton that presumably belongs to a single individual; this specimen possesses a combination of character states not present in other known non-palaeobatrachid pipimorph taxa and is identified here as a new genus and species, Avitabatrachus uliana. The species is moderately small (estimated snout-vent length ca. 35 mm) and shares with Pipidae conch-like squamosals, deeply excavated prootics to form channels for the Eustachian tubes, articulations for the lower jaws at the anterolateral corners of otic capsules, and fused sacrum and urostyle. Avitabatrachus possesses at least eight presacral vertebrae, the first two of which are fused, with flat, opisthocoelous centra. Unique features of this taxon are the presence of parasagittal flanges along the posterior halves of the otic capsules and the wide transverse processes of the posterior presacral vertebrae, which are only slightly anteriorly directed. Preliminary comparisons with other fossil pipoid taxa in the context of recent parsimony analyses suggest that it is the sister taxon of Pipidae. However, this phylogenetic placement of the new taxon should be corroborated in a future rigorous analysis that should include some putative stem pipid taxa that currently are being restudied. © 2000 by the Society of Vertebrate Paleontology.

Registro:

Documento: Artículo
Título:The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina
Autor:Baez, A.M.; Trueb, L.; Calvo, J.O.
Filiación:Departamento de Geología, Facultad de Ciencias Exactas, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Division of Herpetology and Department of Ecology and Evolutionary Biology, Natural History Museum and Biodiversity Research Center, The University of Kansas, Lawrence, KS, 66045-2454, United States
Museo de Geología y Paleontología, Universidad Nacional del Comahue, Neuquén, 8300, Argentina
Año:2000
Volumen:20
Número:3
Página de inicio:490
Página de fin:500
DOI: http://dx.doi.org/10.1671/0272-4634(2000)020[0490:TEKPFF]2.0.CO;2
Título revista:Journal of Vertebrate Paleontology
Título revista abreviado:J. Vertebr. Paleontol.
ISSN:02724634
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v20_n3_p490_Baez

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Citas:

---------- APA ----------
Baez, A.M., Trueb, L. & Calvo, J.O. (2000) . The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina. Journal of Vertebrate Paleontology, 20(3), 490-500.
http://dx.doi.org/10.1671/0272-4634(2000)020[0490:TEKPFF]2.0.CO;2
---------- CHICAGO ----------
Baez, A.M., Trueb, L., Calvo, J.O. "The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina" . Journal of Vertebrate Paleontology 20, no. 3 (2000) : 490-500.
http://dx.doi.org/10.1671/0272-4634(2000)020[0490:TEKPFF]2.0.CO;2
---------- MLA ----------
Baez, A.M., Trueb, L., Calvo, J.O. "The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina" . Journal of Vertebrate Paleontology, vol. 20, no. 3, 2000, pp. 490-500.
http://dx.doi.org/10.1671/0272-4634(2000)020[0490:TEKPFF]2.0.CO;2
---------- VANCOUVER ----------
Baez, A.M., Trueb, L., Calvo, J.O. The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina. J. Vertebr. Paleontol. 2000;20(3):490-500.
http://dx.doi.org/10.1671/0272-4634(2000)020[0490:TEKPFF]2.0.CO;2