Paleohistology of<i>Micropholis stowi</i>(Dissorophoidea) and<i>Lydekkerina huxleyi</i>(Lydekkerinidae) humeri from the Karoo Basin of South Africa, and implications for bone microstructure evolution in temnospondyl amphibians

McHugh, Julia

doi:10.1080/02724634.2014.902845

Cited by 21 publications

(26 citation statements)

References 31 publications

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“…In contrast, LAGs are totally absent in a sampled humerus of the terrestrial amphibamiform M. stowi . This was interpreted as evidence for fast growth during early development among Early Triassic temnospondyls (McHugh, ), although in the strictest sense, it indicates only that growth did not totally cease in this taxon. The presence of fibrolamellar bone in M. stowi (rather than lamellar bone as in Apateon and D. annectens ) suggests a faster absolute growth rate that is likely associated with its larger size (Schoch & Rubidge, ).…”

Section: Resultsmentioning

confidence: 99%

“…The only other terrestrial amphibamiform to be histologically studied is M. stowi , the only dissorophoid from either Gondwana or from the Mesozoic. McHugh () proposed that the absence of LAGs in M. stowi reflected that the animal grew so fast that it achieved a relatively large body size within the first year. This in turn is suggestive of conditions that would necessitate rapid skeletal maturation, such as pronounced seasonality and climatic harshness that would require rapid, opportunistic growth during the more favorable periods in advance of more adverse conditions.…”

Section: Discussionmentioning

confidence: 99%

Section: Similar Variation Was Noted In the Study Of The Branchiosauridmentioning

confidence: 99%

“…The long‐bone histology of D. annectens has been previously examined (e.g., Castanet, Francillon‐Vieillot, de Ricqlés, & Zylberberg, ), but this is the first skeletochronological study across a broad range of sizes (and inferred semaphoronts). More broadly, the long bones of temnospondyls have been previously studied to identify patterns of growth at the histological level (e.g., de Ricqlés, ; McHugh, , ; Mukherjee, Ray, & Sengupta, ; Sanchez, de Ricqlès, Schoch, & Steyer, ; Sanchez & Schoch, ; Sanchez, Steyer, Schoch, & de Ricqlès, ), but the few studies involving relatively large sample sizes with reconstructed growth series have focused primarily on large‐bodied, aquatic stereospondyls (Konietzko‐Meier & Klein, ; Konietzko‐Meier & Sander, ; Steyer, Laurin, Castanet, & de Ricqlès, ).…”

Section: Introductionmentioning

confidence: 99%

“…To date, only two other amphibamiforms have been histologically sampled, the early Permian branchiosaurid Apateon von Meyer, spp. from Europe (Sanchez, de Ricqlès, et al, ; Sanchez, Steyer, et al, ) and the Early Triassic micropholid Micropholis stowi Huxley, from South Africa (McHugh, ), and neither study provided quantitative assessments of growth. The paucity of work on amphibamiforms stems from the paucity of material; many terrestrial amphibamiforms are represented by few specimens and predominantly cranial material that is not amenable to histological sampling.…”

Section: Introductionmentioning

confidence: 99%

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Histological skeletochronology indicates developmental plasticity in the early Permian stem lissamphibian Doleserpeton annectens

Gee

Haridy

Reisz

2020

Ecology and Evolution

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Doleserpeton annectens is a small‐bodied early Permian amphibamiform, a clade of temnospondyl amphibians regarded by many workers to be on the lissamphibian stem. Most studies of this taxon have focused solely on its anatomy, but further exploration of other aspects of its paleobiology, such as developmental patterns, is critical for a better understanding of the early evolutionary history of lissamphibians. Here, we present a histological analysis of growth patterns in D. annectens that utilizes 60 femora, the largest sample size for any Paleozoic tetrapod. We identified pervasive pairs of closely spaced lines of arrested growth (LAGs), a pattern that indicates a marked degree of climatic harshness and that would result in two cessations of growth within a presumed single year. We documented a wide degree of variation compared to previous temnospondyl skeletochronological studies, reflected in the poor correlation between size and inferred age, but this observation aligns closely with patterns observed in extant lissamphibians. Furthermore, sensitivity analyses conducted by subsampling our dataset at more typical sample sizes for paleontological studies produced a wide range of results. This includes biologically improbable results and exceptionally well‐fit curves that demonstrate that low sample size can produce potentially misleading artifacts. We propose that the weak correlation between age and size represents developmental plasticity in D. annectens that typifies extant lissamphibians. Detection of these patterns is likely only possible with large sample sizes in extinct taxa, and low sample sizes can produce false, misleading results that warrant caution in drawing paleobiological interpretations from such samples.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Similar Variation Was Noted In the Study Of The Branchiosauridmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Histological skeletochronology indicates developmental plasticity in the early Permian stem lissamphibian Doleserpeton annectens

Gee

Haridy

Reisz

2020

Ecology and Evolution

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Taxonomic and ecomorphological diversity of temnospondyl amphibians across the Permian–Triassic boundary in the Karoo Basin (South Africa)

Tarailo

2018

Journal of Morphology

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Temnospondyl amphibians experienced a geologically brief interval of success in the wake of the end-Permian mass extinction. This study examines the relationship between taxonomic and ecological diversity of temnospondyls across the Permian-Triassic boundary in the Karoo Basin of South Africa. Ecomorphological diversity, as implied by differences in cranial shape, was incorporated into the study by the use of a landmark-based geometric morphometric analysis.Both taxonomic diversity and cranial disparity are low during the Permian and increase across the Permian-Triassic boundary. Taxonomic diversity is stable through the Triassic, but disparity shows subsequent increases during the Olenekian and Anisian. Temnospondyls are restricted in size immediately following the extinction, but size range fully rebounds by the Olenekian. Cranial shape is heavily influenced by phylogenetic relatedness, and the observed increases in disparity may be partly the result of decreases in the net relatedness of coeval Karoo stereospondylomorph temnospondyls in younger faunas. The increase in community level taxonomic diversity for temnospondyls in the Karoo following the end-Permian mass extinction was likely facilitated by an influx of distantly related and ecologically distinct species. K E Y W O R D S end-Permian mass extinction, geometric morphometrics, morphological disparity, recovery, Stereospondyli

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

Mukherjee

Sengupta

Rakshit

2019

Papers in Palaeontology

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Multiple limb bones of different Middle Triassic capitosaurs from India including Cherninia denwai and Paracyclotosaurus crookshanki were examined to reveal differences in palaeobiology and lifestyle adaptations. Limb bone anatomy of Cherninia is characterized by distinct torsion and its absence in the fore and hindlimb bones, respectively. Substantial torsion is seen in all the limb bones of P. crookshanki. 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. Predominance of incipient fibrolamellar bone tissue is seen in a large bodied Middle Triassic temnospondyl suggesting that such tissues in non‐amniotes helped in achieving large body sizes rapidly. Highly vascularized woven fibred bone tissue in the early ontogeny, transforming to a more stable incipient fibrolamellar bone tissue associated with growth marks later in ontogeny characterizes C. denwai. This suggests rapid sustained growth slowed down and became punctuated later in ontogeny. A continuous slow growth throughout ontogeny is suggested for P. crookshanki as parallel fibred bone and azonal lamellar bone tissue are seen in all the examined limb bones. The growth of C. denwai and P. crookshanki had variable susceptibility to seasonal fluctuations. The onset of sexual maturity was at 55% adult size for Cherninia as implied from the change in tissue type. Cherninia inhabited the bottom of the water column and acted as a passive benthic predator whereas Paracyclotosaurus was a shallow water predator that retained a high level of terrestriality.

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Paleohistology ofMicropholis stowi(Dissorophoidea) andLydekkerina huxleyi(Lydekkerinidae) humeri from the Karoo Basin of South Africa, and implications for bone microstructure evolution in temnospondyl amphibians

Cited by 21 publications

References 31 publications

Histological skeletochronology indicates developmental plasticity in the early Permian stem lissamphibian Doleserpeton annectens

Histological skeletochronology indicates developmental plasticity in the early Permian stem lissamphibian Doleserpeton annectens

Taxonomic and ecomorphological diversity of temnospondyl amphibians across the Permian–Triassic boundary in the Karoo Basin (South Africa)

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

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