Histologie des côtes dorsales de dinosaures et d'un crocodile de l'Ouest du Portugal : implications squelettochronologiques sur la détermination de l’âge et des traits d'histoire de vie

Translated title of the contribution: Dorsal rib histology of dinosaurs and a crocodylomorph from western Portugal: Skeletochronological implications on age determination and life history traits

Katja Waskow, Octavio Mateus

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Bone histology is an important tool for uncovering life history traits of extinct animals, particularly those that lack modern analogs, such as the non-avian dinosaurs. In most studies, histological analyses preferentially focus on long bones for understanding growth rates and determining age. Here we show, by analyzing ornithischians (a stegosaur and an ornithopod), saurischians (a sauropod and a theropod), and a crocodile, rib histology is a suitable alternative. The estimated age for all sampled taxa ranges between 14 to 17 years for Lourinhanosaurus antunesi and 27 to 31 years estimated for Draconyx loureiroi. The theropod Baryonyx was skeletally mature around 23–25 years of age but showed unfused neurocentral sutures, a paedomorphic feature possibly related to aquatic locomotion. Our results show that ribs can contain a nearly complete growth record, and reveal important information about individual age, point of sexual maturity, and, in some cases, sex. Because ribs are more available than long bones, this method opens new possibilities for studying rare and incomplete fossils, including holotypes.

Translated title of the contributionDorsal rib histology of dinosaurs and a crocodylomorph from western Portugal: Skeletochronological implications on age determination and life history traits
Original languageFrench
Pages (from-to)425-439
Number of pages15
JournalComptes Rendus - Palevol
Volume16
Issue number4
DOIs
Publication statusPublished - Jun 2017

Keywords

  • Age at first reproduction
  • Determination of ontogenetic stage
  • Longevity in dinosaurs
  • New histological approach for ribs
  • Skeletal maturity

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