before the arrival of carnivorans in South America. Most of these groups, with the exception of Lutreolina, are now extinct. It has been suggested that the size and shape of the ancestral didelphid's jaw would most closely match that of the modern Marmosa genus.

Characteristics

Didelphimorphs are small to medium-sized marsupials that grow to the size of a house cat. They tend to be semi-arboreal omnivores,

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