sphenodon

/sfee-nuh-don, sfen-uh-/US // ˈsfi nəˌdɒn, ˈsfɛn ə- //UK // (ˈsfiːnəˌdɒn) //

斯芬诺德龙,斯佩诺顿,斯佩诺德龙,斯芬诺德

Definitions

n.名词 noun

This order includes the living Sphenodon (Hatteria) and various extinct forms.
The bone of the jaws in Sphenodon is so hard that when the teeth get worn away, it can act as a substitute.
The humerus is generally without distinct condyles, but they are well developed in the Theromorpha, the Lacertilia and Sphenodon.
In the young Sphenodon the vomers bear teeth, as they do also in Proterosaurus.
Anyhow, Sphenodon is the reptile which stands nearest to the main stem of our ancestry.