
1) Diapsid 2) Diapsid reptile 3) Reptile of New Zealand 4) Sphenodon punctatum 5) Spiny lizard-like reptile
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https://www.crosswordclues.com/clue/tuatara

Tuatara are reptiles endemic to New Zealand and which, although resembling most lizards, are part of a distinct lineage, the order Rhynchocephalia. The two species of tuatara are the only surviving members of their order, which flourished around 200 million years ago. Their most recent common ancestor with any other extant group is with the squama...
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http://en.wikipedia.org/wiki/Tuatara

spiny reptile of New Zealand with vestigial third eye
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http://phrontistery.info/t.html

• (n.) A large iguanalike reptile (Sphenodon punctatum) formerly common in New Zealand, but now 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.
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http://thinkexist.com/dictionary/meaning/tuatara/

either of two species of moderately large, lizardlike reptiles endemic to offshore islets near the main islands of New Zealand. The two species of ... [3 related articles]
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http://www.britannica.com/eb/a-z/t/88

The Tuatara or Spenodon (Sphenodon punctatus, Sphenodon guntheri or Hatteria punctata) is the only surviving genus of the snout-headed reptiles, Rhynchocephalia order or group of prehistoric reptiles which preceded the dinosaurs. The tuatara is a lizard-like reptile found only on some 30 islands off the north coast of New Zealand, the Sphenodon gun...
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http://www.probertencyclopaedia.com/browse/BT.HTM

[
n] - only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand
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http://www.webdictionary.co.uk/definition.php?query=tuatara
Sphenodon punctatum noun only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand
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https://www.encyclo.co.uk/local/20974

Lizardlike reptile of the genus
Sphenodon. It grows up to 70 cm/2.3 ft long, is greenish black, and has a spiny crest down its back. On the top of its head is the pineal body, or so-called `third eye`, linked to the brain, which probably acts as a kind of light me...
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https://www.encyclo.co.uk/local/21221

a large, primarily nocturnal, lizardlike reptile, Sphenodon punctatum, of islands near the coast of New Zealand: the only surviving rhynchocephalian.
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https://www.infoplease.com/dictionary/tuatara
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