Osteology and skeletal development ofPyxicephalus adspersus (Anura: Ranidae: Raninae)

Sheil, Christopher A.

doi:10.1002/(sici)1097-4687(199904)240:1<49::aid-jmor5>3.0.co;2-z

Cited by 105 publications

(42 citation statements)

References 19 publications

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“…QU 17279 also differs from QU 17376 in lacking a horizontal groove containing a minute foramen above the condyloid fossa QU 17376. However, based on comparisons with extant frogs [19], [20], [21], most or all of these differences can be attributed to ontogeny: we interpret QU 17279 as a post-metamorphic individual, yet younger than the presumably mature adult specimen represented by QU 17376. This conclusion is supported by the patent notochordal canal in presacral VIII of QU 17279.…”

Section: Resultsmentioning

confidence: 91%

A Re-Interpretation of the Eocene Anuran Thaumastosaurus Based on MicroCT Examination of a ‘Mummified’ Specimen

et al. 2013

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What originally appeared to be only an external cast of an anuran ‘mummy’ from the Quercy Phosphorites (southwestern France) was described as Rana plicata during the 19th century. Its geographical provenance is only vaguely known; therefore its precise age within the Paleogene was uncertain. The taxon was erected on the basis of the external morphology of the specimen, which includes few diagnostic characters. As a further complication, the name Rana plicata was recently shown to be unavailable at the time of the description, and the name Rana cadurcorum was proposed as a replacement. In order to see whether internal features were fossilized, the fossil was CT scanned. This showed that a large part of the skeleton is preserved. Unexpectedly, the scans revealed that the skull of the mummy is almost identical to that of Thaumastosaurus gezei, another anuran from the late middle or late Eocene of the Quercy Phosphorites. The few observed differences are attributable to intraspecific and ontogenetic variation, and R. cadurcorum is a junior subjective synonym of T. gezei. The mummy is therefore probably from the same time interval as T. gezei. The latter was previously known only by its skull, but the mummy provides important information on the postcranial skeleton. Earlier assessments, based only on the skull, placed Thaumastosaurus close to South American hyloid anurans, but a new phylogenetic analysis including postcranial characters reveals ranoid affinities. This study exemplifies the usefulness of modern imaging technologies that allow non-destructive study of previously inaccessible internal anatomical features.

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Section: Resultsmentioning

confidence: 91%

A Re-Interpretation of the Eocene Anuran Thaumastosaurus Based on MicroCT Examination of a ‘Mummified’ Specimen

et al. 2013

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“…The development mode of omosternum in Rana dalmatina is the same as was observed in Pyxicephalus adspersus Tschudi 1838 (Haas 1999;Sheil 1999) (Fig. 2b; Table 3).…”

Section: Ontogenetic Development Of Omosternummentioning

confidence: 99%

How can ontogeny help us to understand the morphology of anuran pectoral girdle?

Robovska-Havelkova

2010

Zoomorphology

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The ontogenetic development of the pectoral girdle in seven anuran species (Xenopus laevis, Discoglossus pictus, Bombina bombina, Bombina variegata, Pelobates fuscus, Bufo bufo and Rana dalmatina) was studied using cleared and stained specimens. The epicoracoid cartilage was found to develop in two different ways resulting in an arciferal or firmisternal type of the pectoral girdle. In the arciferal one, the epicoracoid originates from a medial prolongation of the procoracoid cartilage and broadly overlaps its counter part during further development. In the firmisternal pectoral girdle, the epicoracoids are formed by the widened cartilaginous medial edges of the coracoids that fuse together along the midline. Polarization of ontogenetic characters shows, that omosternum evolves inside Anura, and the type of sternum occurring in basal Anura seems to be an apomorphy of all Batrachia. The sternal elements have a single or paired rudiment, their development is connected with M. rectus abdominis or a zonal area and they remain cartilaginous or ossify during postmetamorphic development. An occurrence of omosternum in Barbourula busuangensis was described for the first time.

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“…Various vertebrate groups posses a paired ossification at the rostral tip of the mandible. This is termed the mental, mentomandibular, or more often mentomeckelian bone, and is better known in some jawed fishes (Schultze 1993;Grande and Bemis 1998;Adriaens and Verraes 1998) and lissamphibians (Trueb 1993;Sheil 1999;Yeh 2002). Less commonly, a similar element is found in the lower jaws of extant lizards (De Beer 1937;Jollie 1973) and birds (Baumel and Witmer 1993).…”

Section: Origins Of the Predentary Bonementioning

confidence: 99%

A Late Triassic dinosauriform from south Brazil and the origin of the ornithischian predentary bone

2007

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Osteology and skeletal development ofPyxicephalus adspersus (Anura: Ranidae: Raninae)

Cited by 105 publications

References 19 publications

A Re-Interpretation of the Eocene Anuran Thaumastosaurus Based on MicroCT Examination of a ‘Mummified’ Specimen

A Re-Interpretation of the Eocene Anuran Thaumastosaurus Based on MicroCT Examination of a ‘Mummified’ Specimen

How can ontogeny help us to understand the morphology of anuran pectoral girdle?

A Late Triassic dinosauriform from south Brazil and the origin of the ornithischian predentary bone

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