Ontogenetic stages of ceratopsian dinosaur Psittacosaurus in bone histology

• Autorzy: Zhao Q. , Benton M.J. , Hayashi S. , Xu X.
• Języki publikacji: EN

Abstrakty

EN

The early ceratopsians Psittacosaurus and Protoceratops have provided important information on dinosaurian development because of abundant specimens of adults, subadults, juveniles, and even hatchlings. Here we present new data and methods for identifying key growth stages from bone histology. Previous studies on Psittacosaurus lujiatunensis from the Early Cretaceous Jehol Biota of China did not present in-depth analysis of growth patterns. Based on a histological study of 43 thin sections from 17 individuals of this species, we recognize four histological ontogenetic stages, i.e., hatchling, juvenile, sub-adult, and adult, but no fully-grown stage. We estimate life history and longevity from diaphyseal growth line counts and other features of histology. We show that P. lujiatunensis grew fast in early stages (hatchling, juvenile, and subadult), according to the density of vascular canals and the different type of bone tissue; the deposition of parallel fibred bone tissue in the outer cortex of the subadult stage indicates that growth rate was slowing down. We introduce a new graphical method to estimate the occurrence and volumes of vascular canals from thin sections more accurately than current two-dimensional approaches.

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2019
• Tom: 64
• Numer: 2
• Opis fizyczny: p.323-334,fig.,ref.

Twórcy

autor

Zhao Q.

• Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, China
• Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing 100044, China

autor

Benton M.J.

• School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK

autor

Hayashi S.

• Department of Biosphere-Geosphere Science, Okayama University of Science, Okayama, 700-0005, Japan

autor

Xu X.

• Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, China
• Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing 100044, China

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Identyfikatory

DOI

10.4202/app.00559.2018