Leiopelmatidae, or New Zealand and North American primitive frogs, is a family belonging to the suborder Archaeobatrachia. Their relatively primitive form indicates that they have an ancient lineage. The North American frogs of the Genus Ascaphus are now united with the New Zealand frogs of the genus Leiopelma in the Leiopelmatidae family Only four Leiopelma and two Ascaphus extant species are known to belong to the family. Leiopelma are only found in New Zealand.