Abstract
Abstract The synthetic theory of evolution that is favoured by palaeontologists postulates that evolution is gradual. However, Gould and Elredge have shown that evolution was also punctuated, the species of some groups appearing suddenly and some remaining stable throughout their existence. The study of Phyllocerataceae of Jurassic age shows that two types of modes of evolution coexisted over 140 My, and confirms the global model of punctuated equilibria/disequilibria proposed by Chaline et al. [2] , [3] and underlines the importance of phenomena of heterochronies of development (paedomorphosis and peramorphosis) in the evolution of the group. In the setting of this note it was not possible to consider all modes of the evolution of Phyllocerataceae, they will be the subject of an ulterior publication.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
