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North American Eocene tapiroids evolved along two main lines, represented by the families Isectolophidae and Helaletidae….
origin, evolution, North America, Tapiroidea
Radinsky, Leonard. 1963. "Origin and early evolution of North American Tapiroidea." Bulletin of the Peabody Museum of Natural History , (17). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/17