Taphonomic history of a dinosaur skeleton from the upper Cretaceous Frenchman Formation, Canada: insights from ancient rhizoetchings and invertebrate bioerosion trace fossils

Ichnos/Ichnos : an international journal for plant and animal traces, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 20

Published: Jan. 20, 2025

Language: Английский

Intraskeletal histovariability and skeletochronology in an ornithopod dinosaur from the Maestrazgo Basin (Teruel, Spain)

Journal of Anatomy, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Abstract Ornithopods are an extinct group of dinosaurs that were particularly abundant and diverse in the Cretaceous Iberian Peninsula, whose abundance Maestrazgo Basin has allowed numerous taxa to be identified over last decade. Many these fossil remains still taxonomically indeterminate require a more detailed study on both macroscopic microscopic scale. In this contribution, osteohistological analysis is carried out partial skeleton—composed five incomplete vertebrae, two dorsal ribs, ischium, fibula, tibia—found province Aliaga (Teruel, NE Spain). We progressive slowdown tissue apposition variation type growth marks generated every bone, allowing precise identification ontogenetic stage specimen as subadult individual. The skeletochronological correlation between different elements also suggests reached sexual maturity at around seven years age died nine twelve age. Likewise, usefulness three‐front model proven for first time ornithopod dinosaur, tool analysing histology expressed by bone single inferring their potential. Comparison with other reveals great variability each element shows depending taxon analysed, which prevents us from determining suitable studying skeletochronology any taxon.

Language: Английский

Bone histology and growth curve of the earliest ceratopsian Yinlong downsi from the Upper Jurassic of Junggar Basin, Northwest China

PeerJ, Journal Year: 2024, Volume and Issue: 12, P. e18761 - e18761

Published: Dec. 19, 2024

Yinlong downsi , the earliest known ceratopsian, is represented by dozens of specimens different sizes collected from Upper Jurassic Junggar Basin, northwestern China. Here, we present first comprehensive study on bone histology based ten varying in size. Four ontogenetic stages are recognized: early juvenile, late subadult, and adult. The reconstructed growth curve suggests that may reach sexual maturity at 6 years old, which earlier than well-studied early-diverging ceratopsian Psittacosaurus (9 old) but later ceratopsids (about 3 to 5 old). This indicate begins during evolution ceratopsians, giant size acquired accelerating rates. cortex tibia mainly consists fibrolamellar tissues, parallel-fibered lines arrested (LAGs) very common throughout ontogeny, suggesting a moderate rate. Quantitative analysis indicates has maximum rate similar those other small-sized dinosaurs such as Dysalotosaurus Troodon their rates higher extant squamates crocodiles lower mammals large dinosaurs. body plays more important role factors phylogenetic position and/or diet among non-avian

Language: Английский