Neotominae Sigmodontinae Tylomyinae The New World rats and mice are a group of related rodents found in North and South America.

They are extremely diverse in appearance and ecology, ranging from the tiny Baiomys to the large Kunsia.

This strategy better represents the extreme diversity of species numbers and ecological types.

Some molecular phylogenetic studies have suggested that the New World rats and mice are not a monophyletic group, but this is yet to be confirmed.

The New World rats and mice are divided into 3 subfamilies, 12 tribes, and 84 genera.