Answer the following question given this paragraph: 

Sphenodontia Sphenodontia (“wedge tooth”) arose in the Mesozoic era and includes only one living genus, Tuatara, comprising two species that are found in New Zealand (Figure 29.26). Tuataras measure up to 80 centimeters and weigh about 1 kilogram. Although quite lizard-like in gross appearance, several unique features of the skull and jaws clearly define them and distinguish the group from the squamates.


Q: Sphenodontia sphenodontia (“wedge tooth”) arose in the mesozoic era and includes only one of what?


A:
living genus