Bone Histology Suggests Insularity and Sex Differences in Japanese Sika Deer Growth (Cervus nippon)

Mammal Study, Год журнала: 2025, Номер 50(2)

Опубликована: Апрель 2, 2025

Язык: Английский

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Ontogenetic and interelemental study of appendicular bones of Caiman latirostris Daudin, 1802 sheds light on osteohistological variability in crocodylians

Journal of Morphology, Год журнала: 2024, Номер 285(4)

Опубликована: Апрель 1, 2024

Abstract The osteohistology of vertebrates provides a reliable source to deduce biological information, particularly regarding growth and development. Although osteohistological studies in Neosuchia (Crocodyliformes, Mesoeucrocodylia) are relatively numerous, the number species studied within group is still small. Extant crocodilians known exhibit intraspecific variability linked environmental conditions, habitat, feeding, other intrapopulation factors. Here, we analyzed living South American Caiman latirostris throughout posthatching ontogeny. histology several appendicular bones 13 different‐sized captive wild individuals were examined. some thin sections revealed classic lamellar, parallel‐fibered, or woven bone matrices, others showed variation mix between organization tissue. These histological differences likely related dynamics caimans. In juveniles studied, remnants embryonic observed. Osteohistological prevailing conditions documented. Furthermore, our results show ontogenetic type tissues deposited development C. . This study offers broad framework for life history interpretations insight into evolutionary extinct crocodylian lineages.

Язык: Английский

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The pseudosuchian record in paleohistology: A small review

The Anatomical Record, Год журнала: 2024, Номер 308(2), С. 245 - 256

Опубликована: Апрель 24, 2024

Abstract Archosauria originated around the Earth's largest biotic crisis that severely affected all ecosystems globally, Permotriassic Mass extinction event, and comprises two crown‐group lineages: bird‐lineage crocodylian lineage. The bird lineage includes iconic pterosaurs, as well dinosaurs birds, whereas clades such aetosaurs, poposaurs, “rauisuchians,” Crocodylomorpha; latter being represented today only by less than 30 extant species of Crocodylia. Despite playing important roles during Mesozoic Cenozoic ecosystems, both on land in water, Pseudosuchia received far attention compared to bird‐lineage, which is also reflected number scope histological studies so far. Lately, field has seen a shift focus toward pseudosuchians, however, symposium “Paleohistological Inferences Paleobiological Traits Pseudosuchia” held International Congress Vertebrate Morphology 2023 Cairns, Queensland, Australia, latest proof that. To put these novel aspects paleohistological paleobiological research into context, an overview non‐extant pseudosuchian taxa whose postcranial bones were studied provided here (c. 80 out total more 700 extinct described) recent trends osteohistology are highlighted. In addition, cranial dental material other potential hard tissues, eggshells otoliths, briefly reviewed well.

Язык: Английский

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Growing with dinosaurs: a review of dinosaur reproduction and ontogeny

Biology Letters, Год журнала: 2025, Номер 21(1)

Опубликована: Янв. 1, 2025

Since the start of twenty-first century, there has been a notable increase in annual publications focusing on dinosaur reproduction and ontogeny with researchers using these data to address range macroevolutionary questions about dinosaurs. Ontogeny, which is closely tied osteological morphological variation, impacts several key research areas, such as taxonomic diversity, population dynamics, palaeoecology, macroevolution, well physiological reproductive factors driving ecological success. While broad studies have significantly advanced our understanding evolution, they also revealed important challenges areas needing further investigation. In this review, we aim outline some major linked ontogeny, namely biology, osteohistological growth strategies, variation link between macroevolution. We offer recommendations for best practices promising future directions. These include increasing sample sizes through fieldwork exhaustive use pre-existing fossil collections, micro-computed tomography (μCT) scanning methods dataset non-destructive manner, methodical collection reposition μCT scan data, assessing ontogenetic maturity, establishing consistency terminology building comprehensive extant comparative datasets.

Язык: Английский

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A fast start: Evidence of rapid growth in Trialestes romeri, an early Crocodylomorpha from the Upper Triassic continental beds of Argentina based on osteohistological analyses

Journal of Anatomy, Год журнала: 2025, Номер unknown

Опубликована: Янв. 31, 2025

The palaeobiology aspects of early Crocodylomorpha during their origin in the Triassic are poorly known, despite occupying an important palaeoecological role continental environments. In this study, we report microstructural features appendicular bones two specimens Trialestes romeri, a non-Crocodyliformes from Upper NW Argentina. Our goals to infer life history (i.e. age estimation and maturity events), inter-elemental variation growth dynamics within phylogenetic framework. samples include humerus ulna holotype (PVL 2561) femur referred specimen 3889). All elements mostly composed by fibrolamellar complex with variable distribution parallel-fibred bone cortex. Furthermore, they possess uniform homogeneous vascularisation, formed mainly laminar pattern. PVL 2561 records lines arrested (LAGs) no cyclical marks were registered ulna. Meanwhile, 3889 exhibit single LAG. Hence, slight disparate is reported both individuals. absence external fundamental system (EFS) homogenous matrix vascularisation suggest that did not attain sexual somatic maturity. Overall, histological T. romeri indicate rapid rate just like other crocodylomorphs (Terrestrisuchus, Saltoposuchus), whereas others rather moderate (Crocodylomorpha indet. BP/1/8484 specimen) or slower (Hesperosuchus) rate. These findings reveal rates widely present among occurrence evolutionary might it plesiomorphic condition.

Язык: Английский

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Palaeobiology and osteohistology of South African sauropodomorph dinosaurs

Journal of Anatomy, Год журнала: 2025, Номер unknown

Опубликована: Фев. 17, 2025

Abstract Several sauropodomorph dinosaurs have been excavated from the Elliot Formation (EF) of Southern Africa which include important taxa such as Massospondylus , Melanorosaurus and Antetonitrus . The study bone microstructure smaller, bipedal Sauropodomorpha larger, quadrupedal Sauropoda allow us to infer how growth dynamics changed during evolution gigantism. Historically, osteohistological studies tended focused on either early diverging (e.g. Plateosaurus & ) or derived (diplodocids titanosaurs), whereas transitionary groups (i.e. Sauropodiformes Sauropoda) are poorly known. Here, we assess palaeobiology two sauropodiformes an sauropod by analysing their histology. Thin sections long bones indeterminate NMQR 3314 1551, SAM–PK–K382 were prepared. general histology all three similar. Rapid through deposition fibrolamellar tissue characterised respective ontogenies. Lines arrested (LAGs) commonly located in mid outer cortex signalling onset uninterrupted growth. Differences these principally related pathological evident femur sauropodiform 1551 formation annuli around LAGs indet., well location compacta. number varied among but generally regions showed accumulation LAGs. our similar sauropods It appears that abundance at later ontogenetic stages likely key traits gigantism Sauropoda, supports occurrence a mosaic dynamic patterns Sauropodomorpha.

Язык: Английский

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Bone histology of Smilodon populator and Puma concolor from the Pleistocene of equatorial Brazil with comments on fossil diagenesis

Quaternary International, Год журнала: 2025, Номер 727, С. 109741 - 109741

Опубликована: Март 31, 2025

Язык: Английский

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TAPHONOMY AND PALEOHISTOLOGY OF A DINOSAUR RIB FROM MARÍLIA FORMATION, BAURU GROUP, IN THE STATE OF MINAS GERAIS, BRAZIL

Cretaceous Research, Год журнала: 2024, Номер 160, С. 105899 - 105899

Опубликована: Апрель 4, 2024

Язык: Английский

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Hard tissue thin‐sectioning techniques in vertebrate paleohistology: Review, synthesis and improvements

Methods in Ecology and Evolution, Год журнала: 2024, Номер unknown

Опубликована: Дек. 2, 2024

Abstract Paleohistology provides a significant amount of information on the physiology and evolution ancient organisms through study their fossilized tissues' microstructure. Such discipline has been increasingly applied in vertebrate research over years, however comprehensive up‐to‐date methodological resources are lacking. In specific, technical expedients associated with mammal little mentioned some standards protocols still needed for homogenization paleohistological research. This work includes review summary current techniques, new proposals improvement most widely used preparation sectioning hard tissues. We further expand focus beyond traditional techniques including dentognathic remains, fossil extant. The guide provided herein covers necessary to produce thin section, providing step‐by‐step instructions along insights technicians both beginners experienced scientists. Although paleohistology is applied, its aspect often overlooked. With this work, we considerably improve learning process, help standardize make them accessible researchers, increasing scientists' awareness thin‐sectioning encouraging exploration methodologies field.

Язык: Английский

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Growth and life history of freshwater chelydrid turtles (Testudines: Cryptodira): A bone histological approach

Journal of Anatomy, Год журнала: 2024, Номер unknown

Опубликована: Авг. 21, 2024

Abstract The current study examines the growth pattern and lifestyle habits of freshwater snapping turtles Chelydra Macrochelys based on limb bone histology. Femora, humeri, tibiae 25 individuals selected from a range ontogenetic stages were assessed to determine inter‐element intraskeletal histological variation. Osteohistological assessment multiple elements is consistent with overall moderate rates as revealed by dominance parallel‐fibered bone. However, was cyclical shown deposition lines arrested growths in compacta. It appears that tissue C. serpentina more variable through ontogeny intermittent higher rates. M . temminckii grow slowly than C possessing compact thick cortices accordance their larger size. Overall, vascularization decreases humeri femora being well‐vascularized both species. Contrarily, epipodials are poorly vascularized, though simple longitudinal radial canals present, suggesting differences patterns when compared associated diaphyseal sections. found be least remodeled bones therefore better suited for skeletochronology turtles. Intra‐elementally, preserved cortical vascularity ventrally, suggestive faster relative growth. We hypothesize differential may relate functional constraints, where forelimbs operational swimming while hindlimbs provide stability.

Язык: Английский

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