The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina

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 a...

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Autores principales: Baez, A.M., Trueb, L., Calvo, J.O.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02724634_v20_n3_p490_Baez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_02724634_v20_n3_p490_Baez2023-10-03T15:15:04Z The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina Baez, A.M. Trueb, L. Calvo, J.O. 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. Fil:Baez, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02724634_v20_n3_p490_Baez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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.
format JOUR
author Baez, A.M.
Trueb, L.
Calvo, J.O.
spellingShingle 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
author_facet Baez, A.M.
Trueb, L.
Calvo, J.O.
author_sort Baez, A.M.
title The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina
title_short The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina
title_full The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina
title_fullStr The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina
title_full_unstemmed The earliest known pipoid frog from South America: A new genus from the middle cretaceous of Argentina
title_sort earliest known pipoid frog from south america: a new genus from the middle cretaceous of argentina
url http://hdl.handle.net/20.500.12110/paper_02724634_v20_n3_p490_Baez
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