From The Collaborative International Dictionary of English v.0.48 [gcide]:
Hatteria \Hat*te"ri*a\ (h[a^]t*t[=e]"r[i^]*[.a]), n. [NL.]
(Zool.)
A New Zealand lizard, which, in anatomical character, differs
widely from all other existing lizards. It is the only living
representative of the order Rhynchocephala, of which many
Mesozoic fossil species are known; -- called also
Sphenodon, tuatara, and Tuatera.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Tuatara \Tu`a*ta"ra\, n. [Maori tuat[`a]ra; tua on the farther
side (the back) + tara spine.] (Zool.)
A large iguanalike reptile (Sphenodon punctatum) formerly
common in New Zealand, but by 1900 confined to certain islets
near the coast. It reaches a length of two and a half feet,
is dark olive-green with small white or yellowish specks on
the sides, and has yellow spines along the back, except on
the neck. It is the only surviving member of the order
Rhyncocephala. Also called tuatera and hatteria.
[Webster 1913 Suppl. +PJC]