There are two maxillary lateral incisors in the deciduous dentition. Strong, complete dentition (42 teeth) with scissor bite, the upper incisors overlapping the lower incisors. These first permanent molars are important for the correct development of a permanent dentition. The rest of the primary dentition erupts after the incisors. This commonly results in the impaction of the incisors during the mixed dentition stage. The "metacone" is a cusp on the molars of the upper dentition in hominids. They possessed synapomorphies with the barbourofelids in the cranium, mandible, dentition, and postcranium. It differs from orangutans in dentition and postcranial morphology. The deciduous dentition is (24 teeth). The molar teeth are simple and peg-like unlike the more elaborate molar dentition of manatees. Horse teeth refers to the dentition of equine species, including horses and donkeys. It is a type of dentition characterized by low-crowned teeth. The evolutionary origin of the vertebrate dentition remains contentious. The long snout had carnivorous dentition. This primitive mammalian dentition is unique among Proboscideans.