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Thesis defense : Jérémie VIVIANI

When Nov 07, 2019
from 10:00 AM to 02:00 PM
Where amphi J
Contact Name
Contact Phone 04 2673 1338
Attendees HUYSSEUNE Ann, Professeure, Ghent University, Rapporteure
LECOINTRE Guillaume, Professeur, Muséum National d’Histoire Naturelle, Rapporteur
JANVIER, Philippe, Directeur de Recherche émérite, Muséum National d’Histoire Naturelle, Examinateur
SCHNELL, Nalani, Maître de conférences, Muséum National d’Histoire Naturelle, Examinatrice
GALZIN René, Directeur d’étude émérite, Ecole Pratique des Hautes Etudes, Co-encadrant
VIRIOT Laurent, Professeur, Université Lyon 1, ENS Lyon, Directeur
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Jérémie VIVIANI of the team of Laurent VIRIOT will support his thesis on November 7th at 10 am. It is entitled: :

"Evolutionary dynamics of the dentition in parrotfish (Scarinae, Labriformes) in relation to the habitat, behavior and diet."


Parrotfishes, divided into the tribes Scarini and Sparisomatini, are labrid fishes that arouse from carnivorous ancestors. One of the main factors that explain this radiation is the exploitation of microorganisms as a food source. While most Sparisomatini browse macroalgae to get epiphytic microorganisms, grazing parrotfishes (all Scarini and some Sparisoma) scrap or excavate hard substrate to obtain epilithic and endolithic microorganisms. Changes in feeding behaviour are associated with dentition specialization with notably dental plates in grazing but also some browsing parrotfishes. Gene-based phylogenies contradicted the previous evolutionary scenario about parrotfish dentition evolution, which states the progressive emergence of dental plates from non-coalesced dentitions. This thesis manuscript aims to re-examine the evolution of parrotfish dentitions in the light of the new phylogenies by using X-ray 3D microtomography, and to link this evolution with diet and ecology.

The defense will be in english.