Biological aspects of the Permian dicynodont Oudenodon (Therapsida: Dicynodontia) deduced from bone histology and cross-sectional geometry
Date
2003
Authors
Botha, Jennifer
Journal Title
Journal ISSN
Volume Title
Publisher
Bernard Price Institute for Palaeontological Research
Abstract
Bone histology and cross-sectional geometry were used to examine the growth patterns and lifestyle habits of the Late Permian
dicynodont, Oudenodon. Several limb bones were analysed, revealing rapidly deposited fibro-lamellar bone, interrupted by annuli or
sometimes Lines of Arrested Growth. Peripheral slowly deposited parallel-fibred bone was observed in several elements. It is suggested
that the initial growth of Oudenodon was rapid during the favourable growing season, but decreased or sometimes ceased completely
during the unfavourable season. Growth was cyclical and may have been sensitive to environmental fluctuations. The slowly forming
parallel-fibred bone towards the sub-periosteal surface in several elements indicates a permanent transition to slow growth and may
reflect the onset of sexual maturity. Bone cross-sectional geometry results reveal a markedly thick cortex, indicating a possible modification
for digging. These cross-sectional geometry values, in conjunction with the limb morphology, suggest that Oudenodon was
fossorial.
Description
Main article
Keywords
Permian; dicynodont; histology
Citation
None