Evolution: Sole survivor of a once-diverse lineage

Journal name:
Nature
Volume:
545,
Page:
158
Date published:
DOI:
doi:10.1038/545158d
Published online

Bernard Spragg

The tuatara (Sphenodon punctatus) can grow to lengths of 60 centimetres.

The tuatara of New Zealand (Sphenodon punctatus; pictured), formerly thought to be a lizard, was recognized 150 years ago this month as the only living member of its own reptile group — Rhynchocephalia (A. Günther Phil. Trans. R. Soc. 157, 595629; 1867).

The tuatara's ancestors separated from those of lizards and snakes (Squamata) around 240 million years ago. The frame-like skull of S. punctatus, long believed to be an archaic feature, is in fact a specialization for supporting its powerful jaws (D. I. Whiteside Phil. Trans. R. Soc. Lond. B 312, 379430; 1986).

The animal's taxonomic isolation has turned it into a flagship species for studies of evolution, biodiversity and conservation (see, for example, A. Cree Tuatara Canterbury Univ. Press; 2014).

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Affiliations

  1. University of Adelaide, Australia.

    • Marc E. H. Jones
  2. South Australian Museum, Adelaide, Australia.

    • Mark N. Hutchinson

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