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Mammalia - Ungulata - Merycoidodontidae
It was synonymized subjectively with Merychyus by Cope (1884), Scott (1890) and Scott (1893).
It was assigned to Merycoidodontidae by Cope (1878), Thorpe (1937), Kelly and Lander (1988) and Lander (1998); and to Ticholeptinae by Schultz and Falkenbach (1941) and Stevens and Stevens (2007).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|C. B. Schultz and C. H. Falkenbach 1941||SKULL.-Medium-sized, ranging in length from approximately 210 mm. to 250 mm.; mesocephalic to brachycephalic; occipital region fan-shaped, similar to that of Ustatochoerus; brain case inflated; malar prominent anterior to orbit (starting above posterior premolar region), causing a broad facial depression in the lacrimal region embracing the facial vacuity; zygomatic arch of light con- struction; nasals moderately long with slight retraction; infraorbital foramen above PLP 4 ; muzzle square and broad; occipital condyles light; postglenoid processes large and more robust than in Ustatochoerus; bullre semi-depressed, similar to those of Ustatochoerus.
MANDIBLE.-Medium-sized; Werior border of ramus similar to that of Ustatochoerus; inferior region of angle with pronounced internal curve.
DENTITION.-Slightly hypsodont; lighter than in Ustatochoerus and not as hypsodont; small cusp on interior-posterior portion of pa; inferior premolars not as crowded as in Ustatochoerus; M1 small; pronounced heel on Ma.
LIMBS.-Known only from referred examples of T. hypsodus and from partial limbs of the holotypes of T. rileyi and T. tooheyi; proportionately lighter than Brachycrus and Ustatochoerus; decidedly longer and more robust than in Merychyus.