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Endothermy - an organism that relies primarily on metabolism as a source of body heat.
Eocene - in geological time, an epoch within the Cenozoic dating from 35 to 58 million years ago.
Homeothermic - an organism able to maintain a constant optimal range of body temperature despite fluctuation in the environment. Also referred to as warm-blooded.
Icthyosaur - a dolphin-sized aquatic reptile group that lived from Middle Triassic to the end of the Cretaceous.
Mitochondrial B-cytochrome - a protein found in mitochondria which is a genetic maternal trait.
Pleisiosaur - a large turtle-shaped aquatic reptile group that lived during the Late Triassic to the end of the Cretaceous.
