Amniotes: Taxon of tetrapods, defined by embryonic development.

Anomodontia: A major group of therapsid. They were toothless herbivores.

Diaphragm: a shelf of muscle extending between the thorax and abdomen of mammals.

Embayment: gap.

Endothermy: warm-blooded animals keep their core body temperature at a nearly constant level regardless of the temperature of the surrounding environment.

Homeothermy: warm-blooded animals keep their core body temperature at a nearly constant level regardless of the temperature of the surrounding environment.

Ischium: lower back part of the hip bone.

Maxilla: largest bones of the face, except for the mandible, and form the upper jaw.

Occiput: a saucer-shaped membrane bone situated at the back and lower part of the cranium.

Premaxilla: pair of small cranial bones at the tip of the jaws of many animals, connected to the maxilla and the nasals.

Pubis: One of the three bones which makes up the pelvis.

Sexual dimorphism: systematic difference in form between individuals of different sex in the same species.

Temporal fenestra: bilaterally symmetry holes in the back of the skull.

Vibrissae: hairs specialised for tactile sensation.

Vivipary: embryo develops inside the body of the mother. Mother then gives birth to live young.