The tuatara was given its name by the Maori of New Zealand. Its
name means "peaks on the back", as this lizard-like reptile is
characterised by a series of peaks along its back. It is considered
to be a living fossil, and the most closely related to the dinosaur
of all modern creatures.
Is a tuatara a mammal?
No, Rhynchocephalia is not a subset of Mammalia. The tuatara is
a reptile.