A new Paleogene pipid frog from northwestern Patagonia

Báez, Ana María; Púgener, L. Analía

doi:10.1080/02724634.1998.10011078

Cited by 27 publications

(27 citation statements)

References 11 publications

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“…Although Estes [1975], Cannatella and de Sá [1993] and Báez and Pugener [1998] concluded that the several lineages of fossil pipids must have been present before the continental breakup, this study does not support this model. Rather, overwater dispersal seems to be necessary to explain the phylogenetic and biogeographic patterns of fossil pipids, specifically, the finding that Xenopus and Silurana are embedded in a clade of South American fossils from which they diverged only ∼ 68-75 MYA.…”

Section: Paleobiogeography: Xenopus In Space and Timecontrasting

confidence: 54%

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Xenopus in Space and Time: Fossils, Node Calibrations, Tip-Dating, and Paleobiogeography

Cannatella

2015

Cytogenet Genome Res

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Published data from DNA sequences, morphology of 11 extant and 15 extinct frog taxa, and stratigraphic ranges of fossils were integrated to open a window into the deep-time evolution of Xenopus. The ages and morphological characters of fossils were used as independent datasets to calibrate a chronogram. We found that DNA sequences, either alone or in combination with morphological data and fossils, tended to support a close relationship between Xenopus and Hymenochirus, although in some analyses this topology was not significantly better than the Pipa + Hymenochirus topology. Analyses that excluded DNA data found strong support for the Pipa + Hymenochirus tree. The criterion for selecting the maximum age of the calibration prior influenced the age estimates, and our age estimates of early divergences in the tree of frogs are substantially younger than those of published studies. Node-dating and tip-dating calibrations, either alone or in combination, yielded older dates for nodes than did a root calibration alone. Our estimates of divergence times indicate that overwater dispersal, rather than vicariance due to the splitting of Africa and South America, may explain the presence of Xenopus in Africa and its closest fossil relatives in South America.

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Section: Paleobiogeography: Xenopus In Space and Timecontrasting

confidence: 54%

“…' Shelania' laurenti † was described by Báez and Pugener [1998] from the Eocene Vaca Mahuida Formation, Argentina. They discussed evidence supporting a late Paleocene-middle Eocene age for the frog-bearing strata.…”

Section: Temporal Data: Ages Of Fossils and Calibration Priorsmentioning

confidence: 99%

Xenopus in Space and Time: Fossils, Node Calibrations, Tip-Dating, and Paleobiogeography

Cannatella

2015

Cytogenet Genome Res

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“…The unique feature uniting xenopodines and Shelania, lack of the superior perilymphatic foramina (Baez and Pugener, 1998), could not be determined in the Yemen pipid. However, the Yemen pipid does possess several xenopodine synapomorphies, all of which occur in the plesiomorphic state in Shelania (Baez and Pugener, 1998), indicating that it shares a more recent common ancestor with Silurana and Xenopus than with Shelania: 1) zygomatic ramus of squamosal reaches maxillary arcade; 2) anterior ramus of pterygoid overlies dorsal surface of maxilla; 3) clavicles expanded medially; and 4) articular surface of pre-and postzygapophyses bear sulci and ridges.…”

Section: Taxonomic Assignment and Comparisonsmentioning

confidence: 97%

“…However, the Yemen pipid does possess several xenopodine synapomorphies, all of which occur in the plesiomorphic state in Shelania (Baez and Pugener, 1998), indicating that it shares a more recent common ancestor with Silurana and Xenopus than with Shelania: 1) zygomatic ramus of squamosal reaches maxillary arcade; 2) anterior ramus of pterygoid overlies dorsal surface of maxilla; 3) clavicles expanded medially; and 4) articular surface of pre-and postzygapophyses bear sulci and ridges. Silurana can be diagnosed osteologically by the following characters (Cannatella and Trueb, 1988;Cannatella and de Sa, 1993) that do not occur in the Yemen pipid: 1) vomers absent; 2) frontoparietal bears anterolateral pro cesses; 3) tympanic annulus elliptical; and 4) first and second vertebrae fused.…”

Section: Taxonomic Assignment and Comparisonsmentioning

confidence: 98%

“…Within Pipidae, extant xenopodines (Silurana + Xenopus) and extinct South American Shelania form an unnamed clade that has a sister-group relationship with the lineage now represented by pipines (i.e., the most recent common ancestor of the living Pipa and Hymenochirini and all of its descendants) (Cannatella and Trueb, 1988;Baez and Pugener, 1998). A number of osteological synapomorphies support the pipine clade (Baez and Trueb, 1997) and include the following: 1) skull wedge-shaped; 2) vomers absent; 3) parasphenoid posterior margin positioned anteri orly; 4) vertebrae bear parasagittal spinous processes; and 5) coracoids broadly expanded at sternal ends.…”

Section: Taxonomic Assignment and Comparisonsmentioning

confidence: 99%

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First occurrence of Xenopus (Anura: Pipidae) on the Arabian Peninsula: A new species from the Upper Oligocene of Yemen

Henrici

Báez

2001

J. Paleontol.

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A freshwater interbed of the Yemen Volcanic Group in central western Yemen yielded impressions of numerous, articulated, mostly complete frog skeletons. Recent dating of the volcanics and the stratigraphic position of the fossil bearing bed in the sequence support a Late Oligocene age for the frogs. These frogs are described as a new species of Xenopus, a genus that is today mostly confined to subsaharan Africa, and they provide evidence of the former, wider distribution of this genus on the Afro-Arabian Plate. The new species, X. arabiensis, differs from other Xenopus in its long maxilla and maxillary tooth row. It resembles X. muelleri in its dentate, azygous vomer and prominent, cone-shaped, distally-pointed prehallux, but differs from X. muelleri in having an atlantal intercotylar notch and longer distal prehallux bone. Climatic changes during the Neogene probably led to the extinction of Xenopus on the Arabian Peninsula; however, the timing of this event is not certain.

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Ontogeny of the bizarre: an osteological description ofPipa pipa (Anura: Pipidae), with an account of skeletal development in the species

2000

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The adult osteology of the direct‐developing pipid frog, Pipa pipa, is described based on cleared‐and‐stained and dry skeletal specimens. Observations on skeletal development are based on cleared‐and‐stained embryos and young removed from the backs of preserved females. Osteologically, P.pipa is distinguished from its congeners and other pipid anurans by its large size and peculiar skull, which is extremely depressed and hyperossified. Skulls of the smallest individuals are not significantly different from those of other basal anurans at a similar stage of development; comparisons are made with Bombina orientalis,Discoglossus sardus,Spea bombifrons,Rhinophrynus dorsalis, and Xenopus laevis. The general sequence of chondrification and ossification resembles that of X.laevis; however, there is evidence that the mandible forms earlier in Pipa than in Xenopus. The major allometric transformations that result in the morphologically bizarre skull of adult P.pipa commence after the embryo has resorbed its tail, an event interpreted as marking the end of metamorphic climax in this taxon. In addition, ontogenetic comparisons reveal that the sacrum forms differently in Discoglossus sardus,Silurana tropicalis, and P.pipa. The development of the sphenethmoid region of the skull is the same in P.pipa and X.laevis, and distinctly different from the development of this region of the skull in other non‐pipid basal anurans and neobatrachians for which ontogenetic descriptions exist. J. Morphol. 243:75–104, 2000 © 2000 Wiley‐Liss, Inc.

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A new Paleogene pipid frog from northwestern Patagonia

Cited by 27 publications

References 11 publications

Xenopus in Space and Time: Fossils, Node Calibrations, Tip-Dating, and Paleobiogeography

Xenopus in Space and Time: Fossils, Node Calibrations, Tip-Dating, and Paleobiogeography

First occurrence of Xenopus (Anura: Pipidae) on the Arabian Peninsula: A new species from the Upper Oligocene of Yemen

Ontogeny of the bizarre: an osteological description ofPipa pipa (Anura: Pipidae), with an account of skeletal development in the species

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