New Zealand lacks a very diverse reptile fauna. Essentially we have some lizard species (geckos, skinks) and the tuatara. The tuatara is not exactly a lizard, but the last surviving Sphenodont left in the world. They are a true living fossil. NZ's geckos are also very archaic.
Many of the lizards are small and cryptic, hence the weighting toward common species. Tuatara are restricted in the wild to a few offshore islands and to date, I've not been blessed with the opportunity to see them in the wild.