at least one pair of extremities opposable; hallux with a flat nail or none; a well developed caecum; penis pendulous; testes scrotal; always two pectoral mammae. Notes: Unguiculate - possessing nails, hooves or claws Claviculate - possessing a clavicle (collar bone) Page 1 of 21 Primate Taxonomy Le Gros Clark's Definition Mivart’s definition is quite a good definition considering its age and certainly has the value of being nice and short. A rather more up to date version was produced…