Tuatara: Difference between revisions
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Revision as of 17:48, 29 December 2007
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Sphenodon punctatus (Gray, 1842) | ||||||||||||||
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Hatteria punctata, Gray 1842 |
The tuatara is an amniote[1] of the family Sphenodontidae, native to and found only in New Zealand. The two species of tuatara are the only surviving members of the Sphenodontidae. Related to lizards and snakes of the Class Squamata, they are neither lizard or snake.
As the only living descendent of the order of reptiles known as Rhynchocephalia, tuatara are a focus of research in evolutionary processes and theoretical reconstruction of habitat, appearance and life of the earliest diapsids [2] that thrived millions of years ago .
Tuatara are distinct from all other modern day reptiles. Rhynchocephalians were a much more diverse and numerous order of reptiles during the Triassic period, 251 to 200 millon years ago. With the exception of the tuatara, the entire order probably became extinct approximately 60 million years ago during the late Cretaceous period.
The tuatara has been called a living fossil in error. It is very similar to extinct ancestors but it has developed unique features as a modern species. Comparable to dinosaurs, it has a diapsid skull and other anatomical features shared with prehistoric reptilians.
Notes
- ↑ Amniota University of California Museum of Paleontology
- ↑ the group that additionally includes birds and crocodiles
- ↑ Diapsida University of California Museum of Paleontology
- ↑ Sphenodon punctatus Musico, B. (1999). On-line, Animal Diversity Web. University of Michigan Museum of Zoology Accessed December 29, 2007