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- Title
A Relict Rhinesuchid (Amphibia: Temnospondyli) From The Lower Triassic Of South Africa.
- Authors
Shishkin, M. A.; Rubidge, B. S.
- Abstract
'<E1>Lydekkerina</E1>'<E1>putterilli</E1>Broom from the<E1>Lystrosaurus</E1>Assemblage Zone (Middle Beaufort Group, South Africa) is shown to be a paedomorphic rhinesuchid (<E1>Broomistega putterilli</E1>gen. nov.) rather than a lydekkerinid or juvenile stage of the rhinesuchid<E1>Uranocentrodon</E1>, as previously presumed. The most conspicuous characters, not related to its paedomorphic condition, include the shape of the parietals and the structure of the parasphenoid body and exoccipitals. The pattern of cranial growth changes in<E1>Broomistega</E1>has been investigated by comparison of the holotype with two hitherto undescribed immature specimens. For several characters referring to the size and position of the orbits, and re-modelling of the jugal proportions, retarded timing of growth transformations, compared to ontogenetic patterns in Permian rhinesuchids (typified by<E1>Muchocephalus</E1>) is demonstrated. Some features of the evolution of the basicranial region of the skull, in the transition from rhinesuchids to more advanced capitosauroids, are re-evaluated.<E5>key words</E5>: temnospondyls, rhinesuchids, relict, paedomorphosis, growth changes.
- Subjects
SOUTH Africa; AMPHIBIANS; PALEONTOLOGY; BONES
- Publication
Palaeontology, 2000, Vol 43, Issue 4, p653
- ISSN
0031-0239
- Publication type
Article
- DOI
10.1111/1475-4983.00144