Merycochoerus
Introduction '''''Merycochoerus''''' (Greek: "ruminant" (merux)-like "swine" (khoiros)) is an extinct genus of oreodont of the family Merycoidodontidae, endemic to North America. They lived during the Early Oligocene 33.9—30.8 mya, existing for approximately . Fossils are widespread through the western United States.Restoration of ''M. carrikeri'' by Robert Bruce Horsfall Restoration of ''M. proprius'' ''Merycochoerus'' was a cud-chewing plant-eater with a long face, tusk-like canine teeth, heavy body, long tail, short feet, and four-toed hooves. The  long animals are thought to have been amphibious, as members of the genus possessed an elongated, barrel-shaped body and short limbs that are typical adaptations found in semi-aquatic mammals.
Species *''M. carrikeri'' (syn. ''Promerycochoerus thomsoni'')*''M. chelydra'' (syn. ''Promerycochoerus barbouri'')*''M. magnus''*''M. matthewi''*''M. pinensis''*''M. proprius''*''M. superbus'' (syn. ''M. fricki'', ''M. leidyi'', ''M. macrostegus'', ''M. montanus'', ''M. temporalis'', ''Promerycochoerus grandis'', ''P. hatcheri'', ''P. hollandi'', ''P. inflatus'', ''P. latidens'', ''P. loomisi'', ''P. lulli'', ''P. marshi'', ''P. microcephalus'')*''M. vantasselensis''
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