Contributions in Science, Nummer 521

alveolus anteriorly anteroposterior apomorphic approximately Archaeoparadoxia Behemotops California Calippus canine Carranza-Castañeda cecilialina central Mexico Character Clark condyle coronoid Cosoryx cranium crest crown cusps dentary desmostylians diameter diaphysis diastema Dinohippus distal end Domning Domning and Barnes dorsal dorsoventrally DPOF enamel epiphysis eurystyle facet foramen fossa fossil genus Grammohippus holotype skeleton hondurensis humerus hypocone hypoconid incisors Inuzuka Juchipila Juchipila Basin katsuiei labial LACM larger late Hemphillian faunas lateral length lingual Locality ZJ lower incisors lower premolars lumbar mammals mandibular margin medial mesosterna metaconid mexicanus Mexico Miocene Mixtón molars MPGJ Museum nasal bones Neohipparion Neoparadoxia cecilialina neotype occipital Ocote Paleontology paleoparadoxiids Panofsky Phylogenetic Analysis plesiomorphic Plioceros posterior posteriorly premaxilla premolars protocone protoconid Rancho El Ocote relatively repenningi root San Miguel sediments Shikama side skull species specimen Sphenophalos squamosal surface suture tabatai Tecolotlán teeth thoracic vertebrae tibia tooth transverse U-Pb ulna weltoni width Zacatecas zircon