Bone Microstructure of the Stereospondyl Lydekkerina Huxleyi Reveals Adaptive Strategies to the Harsh Post Permian‐Extinction Environment

  title={Bone Microstructure of the Stereospondyl Lydekkerina Huxleyi Reveals Adaptive Strategies to the Harsh Post Permian‐Extinction Environment},
  author={Aurore Canoville and Anusuya Chinsamy},
  journal={The Anatomical Record},
The small‐bodied stereospondyl Lydekkerina huxleyi, dominated the amphibian fauna of the South African Lower Triassic. Even though the anatomy of this amphibian has been well described, its growth strategies and lifestyle habits have remained controversial. Previous studies attributed the relative uniformity in skull sizes to a predominance of subadult and adult specimens recovered in the fossil record. Anatomical and taphonomic data suggested that the relatively small body‐size of this genus… 

Bone histology of dinocephalians (Therapsida, Dinocephalia): palaeobiological and palaeoecological inferences

We investigate the bone histology of multiple skeletal elements of dinocephalian taxa from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa. The results show that

Postcranial anatomy and histology of Seymouria, and the terrestriality of seymouriamorphs

Seymouria is the best known of the seymouriamorphs, a group of Permo-Carboniferous reptiliomorphs with both terrestrial and aquatic taxa. The majority of research on Seymouria has focused on cranial

Functional Morphology of Stereospondyl Amphibian Skulls

Size independent skull morphometrics were used, in conjunction with analyses of the fossil record and comparative anatomy, to provide a synthesis of the functional morphology of stereospondyl amphibians, showing the pattern of ‘disaster’ taxa: rapidly diversifying following a mass extinction, spreading to a global distribution, although this high diversity was relatively short-lived.

New biological insights into the Middle Triassic capitosaurs from India as deduced from limb bone anatomy and histology

Woven fibred bone tissue, a very rapidly deposited tissue mostly seen in the embryos and very young individuals of higher vertebrates, is reported for the first time in a juvenile temnospondyl suggesting that such tissues in non‐amniotes helped in achieving large body sizes rapidly.

To be or not to be heavier: The role of dermal bones in the buoyancy of the Late Triassic temnospondyl amphibian Metoposaurus krasiejowensis

Stereospondyli are a clade of large aquatic temnospondyls known to have evolved a large dermal pectoral girdle. Among the Stereospondyli, metoposaurids in particular possess large interclavicles and

Interrelationships, palaeobiogeography and early evolution of Stereospondylomorpha (Tetrapoda: Temnospondyli)

The stereospondylomorph temnospondyls form a diverse group of early tetrapods that survived the Permian–Triassic extinction event and radiated during the Triassic. They encompass Carboniferous and

Digging the compromise: investigating the link between limb bone histology and fossoriality in the aardvark (Orycteropus afer)

It is hypothesized that the unusual histological profile of the aardvark is likely the outcome of physiological constraints due to both extensive digging behavior and strong metabolic restrictions, which highlight the difficulties of deciphering all factors potentially involved in bone formation in fossorial mammals.

Living fast in the Triassic: New data on life history in Lystrosaurus (Therapsida: Dicynodontia) from northeastern Pangea

It is demonstrated that Lystrosaurus from China have larger average body sizes than their southern Pangean relatives and that their cranial morphologies are distinctive, and the osteohistological examination reveals sustained, rapid osteogenesis punctuated by growth marks in some, but not all, immature individuals from China.

Variability of growth pattern observed in Metoposaurus krasiejowensis humeri and its biological meaning

The specimens do not show any pattern of histological variation; humeri represent a taxonomic diversity; the analyzed Metoposaurus bones stem from two different populations separated by space and; or time or sexual dimorphism.

A Juvenile Specimen of the Trematopid Acheloma From Richards Spur, Oklahoma and Challenges of Trematopid Ontogeny

The complete skull and articulated mandibles of a diminutive trematopid specimen (OMNH 79318) from the Early Permian karst deposits near Richards Spur, Oklahoma is described, providing evidence that variation in otic notch structure can be ontogenetically influenced, not only among eucacopine dissorophids but also among treMatopids.



Bone microstructure and the evolution of growth patterns in Permo-Triassic therocephalians (Amniota, Therapsida) of South Africa

Results support a synergistic model of size reductions for Triassic therocephalians, influenced both by within-lineage heterochronic shifts in survivor taxa and phylogenetically inferred survival of small-bodied taxa that had evolved short growth durations.

Paleohistology and Histovariability of the Permian Stereospondyl Rhinesuchus

  • J. Mchugh
  • Geography, Environmental Science
  • 2014
Narrowly banded annuli and rest lines in the inner cortex of Late Permian elements indicate a taxon that was able to weather successive seasons of harsh conditions, and perhaps indicates a reason for the success of Stereopsondyli through the Permo-Triassic mass extinction.


The cranial anatomy of L. huxleyi is redescribed in detail and the mandible is described in detail for the first time and is shown to possess an extensive denticle shagreen on all three coronoid elements, and a distinctly elongated, prong-like arcadian process of the postglenoid area.

The evolution of long bone microstructure and lifestyle in lissamphibians

Abstract The compactness profile of femoral cross-sections and body size of 105 specimens of 46 species of lissamphibians was studied to assess the effect of lifestyle (aquatic, amphibious, or


Cladistic analysis using the postcranial data obtained in this study indicates that within the Stereospondyli Lydekkerina huxleyi is neither a member of the Rhinesuchidae nor the Mastodonsauroidea, rather the Lydkkerinidae are a separate taxon.

Immaturity vs Paedomorphism: a rhinesuchid Stereospondyl postcranium from the Upper Permian of South Africa

The only rhinesuchid postcranial skeleton described is that of the two-metre-long Uranocentrodon, prepared from the dorsal side, however neither of the descriptions of this material provides sufficient detail for cladistic analysis.


Abstract:  Examination of the bone microstructure of Lystrosaurus murrayi from India and South Africa reveals a predominance of fibrolamellar bone tissue, which suggests rapid periosteal osteogenesis

Growth and life habits of the Triassic cynodont Trirachodon, inferred from bone histology

The bone histology of all the elements consists of a moderately vascularized, periodically interrupted, fibro−lamellar bone tissue, which suggests that the overall growth of Trirachodon was probably rapid during the favourable season, but decreased or ceased during the unfavourable season.

Bone microstructures and mode of skeletogenesis in osteoderms of three pareiasaur taxa from the Permian of South Africa

Microanatomical and microstructural aspects of osteoderms of the three pareiasaur taxa Bradysaurus, Pareiasaurus and Anthodon from the Permian of South Africa are described and a generalized mode of osteoderm formation, consistent with intramembraneous skeletogenesis, is hypothesized to be present in all pareiaaurs.

Body size and growth patterns in the therocephalian Moschorhinus kitchingi (Therapsida: Eutheriodontia) before and after the end-Permian extinction in South Africa

It is suggested that Permian and Triassic Moschorhinus exhibited differential rates of early skeletal growth, corroborating the hypothesis that increased environmental variability in the earliest Triassic was associated with rapid growth to a minimum body size requirement and, consequently, shortened developmental times.