On the Upper Triassic Mammals

摘要: 1. The various accounts of the Triassic mammals which have been published since 1941 are summarized. 2. It is claimed that identification a tooth Kuehneotherium as evidence similar Eozostrodon cannot be identified fallacious. held for most part differences in appearances roots these teeth illustrate growth stages and do not provide useful taxonomic data. problematicus Morganucodon watsoni to synonyms parvus . 3. dentition E. described formula given I f C {-PM M f. 4. loss premolars, followed by plugging their sockets bone, described, it shown lower jaw process usually starts with first then second premolars. Examples irregular same happening taking place upper described. 5. A series abnormal postcanine Some interest light they throw on possible relationships. 6. On four cases replacement, other relevant considerations, mammalian diphyodont condition had achieved suggested that, view great amount wear found many teeth, such reduction could only tolerated if life cycle was short. This accordance very small size animal. 7. nature hind limb given. 8. Trituberculate form praecursoris some those symmetrodont Spalacotherium support interpretation recognized Kuhne later demonstrated Crompton & Jenkins. 9. eozostrodonts triconodonts represent basic stock from triconodonts, trituberculates, docodonts possibly multituberculates evolved, well founded.