sphenodon

In mammalogy, a genus of extinct megatherioid edentates, or fossil sloths, remains of which occur in the bone-caves of South America.

In herpetology:

A genus of extant rhynchocephalous lizards of New Zealand. S. punctatus is known as the tuatera. The name is synonymous with Hatteria.

A lizard of this genus.

Same as hatteria.

The tuatara.

coextensive with the order Rhynchocephalia: tuataras