 "Pelophylax esculentus", the edible frog, is the product of crosses between "Pelophylax lessonae" and "Pelophylax ridibundus".Similarly, "Ambystoma laterale", "Ambystoma jeffersonianum", "Ambystoma texanum" and "Ambystoma tigrinum" have been identified as extant parent species to unisexual salamanders within the same genus.However, mitochondrial evidence suggests that the origins of hybrid "Ambystoma", on the maternal line, lie in a relative of "Ambystoma barbouri".