Suiformes (Suina; superorder Paraxonia, order Artiodactyla) A suborder that comprises the Suidae (pigs), Tayassuidae (peccaries), and Hippopotamidae (hippopotamuses), together with ancestral forms. They are non-ruminant artiodactyls in which the upper canine teeth form tusks, the cheek teeth are bunodont, the stomach has three chambers (except in the Suidae where it has two), and the limbs bear four digits (except in the Tayassuidae in which the hind limbs bear three). The suborder appeared first during the Eocene.
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