One, a fragmentary molariform ( molar or molar-like premolar the identities of gondwanathere tooth are poorly understood ) is larger and lower-crowned than the " Lavanify " teeth and the other, which is complete and unworn, is yet lower-crowned and has the surface obliquely oriented.
22.
"Aprotodon " differs from " Chilotherium " in its proportionally larger and wider symphysis; the horizontal mandibular ramus is curved both in side view and in dorsal view, unlike most rhinocerotids; and the premolars are semi-molariform, unlike the fully molariform premolars in " Chilotherium ".
23.
"Aprotodon " differs from " Chilotherium " in its proportionally larger and wider symphysis; the horizontal mandibular ramus is curved both in side view and in dorsal view, unlike most rhinocerotids; and the premolars are semi-molariform, unlike the fully molariform premolars in " Chilotherium ".
24.
Furthermore, they noted that the transition from blade-like to molariform premolars had actually been observed in the fossil record of the extinct sthenurine kangaroos, and that the first molariform in " Sudamerica " and " Gondwanatherium " is laterally compressed, suggesting that it may have derived from a blade-like tooth.
25.
Furthermore, they noted that the transition from blade-like to molariform premolars had actually been observed in the fossil record of the extinct sthenurine kangaroos, and that the first molariform in " Sudamerica " and " Gondwanatherium " is laterally compressed, suggesting that it may have derived from a blade-like tooth.
26.
When it was discovered that " Sudamerica " had four molariform teeth and no bladelike premolar in its lower jaw, Pascual, Kielan-Jaworowska, and colleagues removed MACN Pv-RN 975 from " Ferugliotherium ", which they expected to have the same dental formula as its fellow gondwanathere " Sudamerica ", and identified it as an indeterminate multituberculate instead.
27.
Krause and colleagues compared the dentary in detail to that of " Sudamerica ", the only other gondwanathere for which a substantial fragment of the jaw was known . " Sudamerica " has only four, not five, cheekteeth ( all of which are molariform ), a higher, narrower incisor with a root that extends further through the dentary, and a shorter diastema; in all these respects, TNM 02067 is more primitive.
