Paleohistology and histovariability of the Permian stereospondyl<i>Rhinesuchus</i>

McHugh, Julia

doi:10.1080/02724634.2013.787429

Cited by 18 publications

(23 citation statements)

References 32 publications

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“…Double LAGs are rarely identified in temnospondyls (e.g., McHugh, ; Sanchez, Steyer, et al, ) but they are not uncommon in lissamphibians (e.g., Castanet & Caetano, ; Castanet & Smirina, ; Francillon‐Vieillot, Arntzen, & Géraudie, ; Smirina, ). The interpretation(s) of this pattern in extinct tetrapods draw heavily on work regarding extant tetrapods and frequently propose that this feature represents two cessations in growth during 1 year (aestivation and hibernation) due to unfavorable conditions, such as climatic harshness or fluctuations in prey density.…”

Section: Discussionmentioning

confidence: 99%

“…Double LAGs are rarely identified in temnospondyls (e.g., McHugh, 2014; but they are not uncommon in lissamphibians (e.g., Castanet & Caetano, 1993;Castanet & Smirina, 1990;Francillon-Vieillot, Arntzen, & Géraudie, 1990;Smirina, 1994).…”

Section: Interpretation Of Double Lagsmentioning

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%

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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: Discussionmentioning

confidence: 99%

Section: Interpretation Of Double Lagsmentioning

confidence: 99%

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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“…A study dedicated to Rhinesuchus palaeohistology concluded that it had a fully aquatic lifestyle (McHugh, 2014), whereas Lydekkerina , a basal stereospondyl, was amphibious with a tendency to be terrestrial (Canoville and Chinsamy, 2015). …”

Section: Theoretical Curves Constructionmentioning

confidence: 99%

Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades

Rey

Amiot

Fourel

et al. 2017

eLife

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The only true living endothermic vertebrates are birds and mammals, which produce and regulate their internal temperature quite independently from their surroundings. For mammal ancestors, anatomical clues suggest that endothermy originated during the Permian or Triassic. Here we investigate the origin of mammalian thermoregulation by analysing apatite stable oxygen isotope compositions (δ18Op) of some of their Permo-Triassic therapsid relatives. Comparing of the δ18Op values of therapsid bone and tooth apatites to those of co-existing non-therapsid tetrapods, demonstrates different body temperatures and thermoregulatory strategies. It is proposed that cynodonts and dicynodonts independently acquired constant elevated thermometabolism, respectively within the Eucynodontia and Lystrosauridae + Kannemeyeriiformes clades. We conclude that mammalian endothermy originated in the Epicynodontia during the middle-late Permian. Major global climatic and environmental fluctuations were the most likely selective pressures on the success of such elevated thermometabolism.DOI: http://dx.doi.org/10.7554/eLife.28589.001

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“…However, long bone histological examination allows a direct assessment of various aspects of tetrapod paleobiology, such as ontogeny, growth patterns, and lifestyle (Chinsamy‐Turan, ; Ricqlès, ; Chinsamy‐Turan, ; Padian and Lamm, ). Long bone and osteoderm histology has been examined in ecologically diverse temnospondyls from the Permian and Triassic (Damiani, ; Steyer et al, ; Mukherjee et al, ; Sanchez et al, ; Witzmann and Soler‐Gijón, ; McHugh, ; Konietzko‐Meier and Klein, ; Konietzko‐Meier and Sander, ; Konietzko‐Meier and Schmitt, ; Sanchez and Schoch, ; McHugh, ), but only one recent study included a humerus of Lydekkerina (McHugh, ). In the present study, we apply histological and microanatomical approaches to reassess previous hypotheses pertaining to the biology and ecology of Lydekkerina .…”

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confidence: 99%

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

Canoville

Chinsamy

2015

The Anatomical Record

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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, as compared to its Permo-Triassic relatives, could be linked to a shortened, rapid developmental period as an adaptation to maintain successful breeding populations under harsh environmental conditions. Moreover, Lydekkerina's habitat has been hypothesized to be either aquatic or mainly terrestrial. The current study, utilizes bone microstructure to reassess previous hypotheses pertaining to the biology and ecology of Lydekkerina. Various skeletal elements of different-sized specimens are analyzed to understand its growth dynamics, intraskeletal variability, and lifestyle adaptations. Bone histology revealed that our sample comprises individuals at different ontogenetic stages i.e., juveniles to mature individuals. Our results show that these amphibians, despite exhibiting plasticity in growth, experienced an overall faster growth during early ontogeny (thereby attaining sexual maturity sooner), as compared to most other temnospondyls. The microanatomy of the long bones with their thick bone walls and distinctive medullary cavity suggests that Lydekkerina may have been amphibious with a tendency to be more terrestrial. Our study concludes that Lydekkerina employed a peculiar growth strategy and lifestyle adaptations, which enabled it to endure the harsh, dry conditions of the Early Triassic. Anat Rec, 298:1237Rec, 298: -1254Rec, 298: , 2015. V C 2015 Wiley Periodicals, Inc.

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Paleohistology and histovariability of the Permian stereospondylRhinesuchus

Cited by 18 publications

References 32 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

Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades

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

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