What does sphenodon mean?
Sphenodon is the scientific genus that contains the tuatara, the only living representative of the order Rhynchocephalia. Tuataras are native to New Zealand, where surviving populations occur mainly on predator-free offshore islands. They resemble large lizards but are not true lizards; their distinct evolutionary lineage includes a prominent parietal eye, a row of small teeth, and a relatively long lifespan. The name Sphenodon comes from Greek words meaning “wedge” and “tooth.” Although tuataras were once widely distributed across New Zealand, introduced predators and habitat loss greatly reduced them, and they are now protected throughout the country. The term is chiefly used in zoological and scientific contexts, while “tuatara” is more familiar in general usage.
nounA sphenodon is a tuatara, the sole living species of the genus Sphenodon. These distinctive reptiles occur naturally only in New Zealand and are the last surviving members of the order Rhynchocephalia.
- The sole living species of the genus Sphenodon, the tuatara, a reptile native to New Zealand and the last survivor of its evolutionary lineage.
"The only living sphenodon is the tuatara, a remarkable reptile found on a few offshore islands of New Zealand."
"The sphenodon uses its third eye, or parietal eye, to detect changes in light intensity."
"Museum visitors were surprised to learn that the sphenodon and the tuatara are two names for the same living reptile."
The plural is used when referring to multiple members of the genus, especially in taxonomic or zoological writing.
"The two living sphenodons have historically been classified as separate species."
The tuatara survived for more than 200 million years, yet for a time it was believed that no sphenodon remained alive.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of sphenodon
Sphenodon is a New Latin scientific name formed from Greek sphēn, meaning “wedge,” and odṓn, meaning “tooth.” The name refers to the animal's distinctive wedge-shaped teeth. The genus now contains one recognized living species, Sphenodon punctatus, the tuatara.
How sphenodon is actually used
In scientific usage, Sphenodon is normally capitalized as a genus name, while the plural is sphenodons. The name is most often encountered in taxonomic discussion or in the species name Sphenodon punctatus.
Easily confused with sphenodon
A tuatara is a sphenodon, an ancient lineage of reptile, whereas an iguana is a lizard belonging to a separate group.