Growth dynamics and body size evolution of South American long-necked chelid turtles: a bone histology approach.

Pereyra, María Eugenia; Bona, Paula; Cerda, Ignacio Alejandro; Jannello, Juan Marcos; Fuente, Marcelo de la; Desántolo, Bárbara

doi:10.4202/app.00702.2019

Cited by 9 publications

(16 citation statements)

References 49 publications

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“…Among the osteohistological features that reflect ontogeny presented by MPSC R 010 are the high number of LAGs, and the thin zones deposited towards the periosteal margin. Similar features have already been recorded in samples of the podocnemidid Podocnemis expansa (Schweigger, 1812) (Chinsamy & Valenzuela 2008) and the chelid Yaminuechelys maior (Staesche, 1929) (Pereyra et al 2020. The counting of LAGs could be a good method for estimating the age of an individual.…”

Section: Skeletochronology In Long Bones: Ontogeny and Sexual Maturitysupporting

confidence: 68%

Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil

Sena

Bantim

Saraiva

et al. 2021

An. Acad. Bras. Ciênc.

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In this study we provide a comprehensive investigation of the microanatomical and microstructural aspects of the carapace and limb bones of the Early Cretaceous side-necked turtle, Araripemys barretoi, from the Araripe Basin, Brazil. Inter-elemental histovariability reveals different secondary remodelling of the skeletal elements within the same individual. The vascularisation is scarce and mainly longitudinal, also it ceases towards the bone surface, forming an avascular parallel-fi bred bone with closely spaced LAGs. These traits indicate a late ontogenetic stage and a slow growth rate for one of the two A. barretoi specimens. The high cortical thickness of the costal plate suggests an increase of the shell stiffness. The elevated relative bone wall thickness of the ulna compared to other limb bones indicates a case of local pachyosteosclerosis, possibly to improve body stability in the aquatic environment.

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Section: Skeletochronology In Long Bones: Ontogeny and Sexual Maturitysupporting

confidence: 68%

Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil

Sena

Bantim

Saraiva

et al. 2021

An. Acad. Bras. Ciênc.

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“…2017; Pereyra et al . 2020). Therefore, discrepancy in the zone thickness could be interpreted as a result of variation in the growth rates among elements, which is higher in larger (e.g.…”

Section: Discussionmentioning

confidence: 99%

Palaeobiology of the early sauropodomorph Mussaurus patagonicus inferred from its long bone histology

et al. 2022

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We present a detailed histological study of long bones from an ontogenetic series of Mussaurus patagonicus, an early sauropodomorph from the Lower Jurassic of Argentina. Twenty long bones, including humeri, femora and fibulae, obtained from 13 individuals of different body sizes were sampled for histological analysis. In general terms, the cortical bone is formed by a well vascularized fibrolamellar and parallel fibred bone. Except for the smaller individuals, cyclical growth marks (CGMs) are well recorded in all the specimens but their number and relative position is highly variable. Mussaurus exhibits marked variation regarding relative growth rate, with some individuals growing much faster than others. Such variation affects the size of the adult individuals, which results in a poor correlation between the body size and the age/ontogenetic stage for this taxon. These discrepancies may be related to sexual dimorphism and/or developmental plasticity. Intraspecific variation is also recorded with regard to the growth strategies, which can vary from cyclical, as in other early sauropodomorphs, to continuous, as reported in sauropods. Sexual maturity appears to have been reached between 23 and 31 years, which is delayed in comparison to other early sauropodomorphs but more comparable with derived sauropods. The attainment of somatic maturity appears to have been reached at about 14 years after onset of sexual maturity. Mussaurus is a sauropodiform, phylogenetically closer to sauropods than most other Early Jurassic sauropodomorphs, and therefore provides critical information for understanding palaeobiological aspects of the origin of sauropods and the onset of gigantism in this lineage.

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“…The medullary region may be either free, without any bony trabeculae, and is referred to as medullary cavity or it may be infilled extensively with bony trabeculae of the cancellous bone and is termed medullary spongiosa (sensu Ray et al, 2005). Pereyra et al (2020) identified two patterns of organization of the collagen fibers in South American long-necked chelid turtles: fibers in one direction (concentric or longitudinal with respect to the main axis of the bone) and fibers in two directions (concentric and longitudinal with respect to the main axis of the bone, i.e., crossed parallel-fibered bone). In this study, we followed Francillon-Vieillot et al (1990) and Chinsamy-Turan (2005) to identify different bone tissues.…”

Section: Methodsmentioning

confidence: 99%

Histological investigation of burnt bones: A case study of angulate tortoises from the archaeological site, Diepkloof Rock Shelter, Western Cape, South Africa

Bhat

Chinsamy

Parkington

2021

Intl J of Osteoarchaeology

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The current study examined burnt and unburnt tibiae of angulate tortoises from the intermediate and late Howiesons Poort levels at Diepkloof Rock Shelter (DRS) of Western Cape, South Africa, to ascertain heat-induced osteohistological changes. Three types of bone damage caused by fire were recognized: (a) external color change in the bones but otherwise consistent osteological and histological features to unburnt bones; (b) partially burned bones with osteological features obliterated, but histological details still preserved, and carbon inclusions visible along the bone margins and within pore spaces; and (c) completely burned bones with obliterated osteological features, but overall shape is maintained, and except for the presence of cracks and carbon accumulations within pore spaces and around the periosteal margin, histological features are evident. Comparisons with other studies of burnt bone suggest that the bones at DRS were subjected to high temperatures of about 600 C to 900 C. Despite exposure to fire, histological features were intact in all the bones, permitting life history deductions for these angulate tortoises. During early ontogeny, uninterrupted fibrolamellar bone tissue (indicative of rapid growth rates) was deposited, whereas later in ontogeny, slowly formed parallel-fibered bone tissue formed and growth ceased periodically. A minimum age of 10 years was deduced for two individuals, and closely spaced growth marks suggest that the sexual maturity was attained at 7-8 years. Based on the comparisons with modern angulate tortoises, it appears that DRS tortoises had slower growth rates, suggesting less optimal environmental conditions for growth prevailed at the time.

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Growth dynamics and body size evolution of South American long-necked chelid turtles: a bone histology approach.

Cited by 9 publications

References 49 publications

Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil

Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil

Palaeobiology of the early sauropodomorph Mussaurus patagonicus inferred from its long bone histology

Histological investigation of burnt bones: A case study of angulate tortoises from the archaeological site, Diepkloof Rock Shelter, Western Cape, South Africa

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