Eosuchia is an extinct order of diapsid reptiles. Depending on which taxa are included the order may have ranged from the late Carboniferous to the Eocene but the consensus is that eosuchians are confined to the Permian and Triassic. The one constant eosuchian has been Younginia, a small lizard-shaped reptile from the Upper Permian of South Africa. This and a couple of other genera, which may or may not be synonymous with Younginia, make up the family Younginidae. The tangasaurids, a family that includes forms apparently adapted for swimming in fresh water, is also usually included.