didelphid การใช้

• Mammalian groups represented include multituberculates, didelphid marsupials, insectivorans, plesiadapiforms, carnivorans, taeniodonts, mesonychids, condylarths, and cimolestans.
• Though described as a didelphid in the original paper, and their appearance in the Late Cretaceous greatly predates the estimated initial divergence within marsupials 45 million years ago.
• Fossil metatherians are distinguished from eutherians by the form of their teeth; metatherians possess four pairs of Sinodelphys szalayi ", which lived in China around 125 million years ago ( mya ) . This 2003 study presents a new fossil from the early Cretaceous Yixian formation in China called " Sinodelphys szalayi " that gives enough morphological data to possibly be a basal metatherian in its didelphid-like morphology; it shares derived traits, such as dental formation and wrist and ankle structures.