Temporal range: Middle Eocene
Like the extant sirenians (manatee and dugong), Protosiren is thought to have fed on sea grasses as well as freshwater plants. Unlike extant sirenians, Protosiren had hind limbs. Although the limbs were well-developed, they were small and the sacroiliac joint was weak. Consequently, Protosiren is thought to have been mainly aquatic, rarely venturing on to land.
- Berta, Annalisa, 2017. Rise of Marine Mammals: 50 Million Years of Evolution. Johns Hopkins University Press.
- Domning, D. P.; Morgan, G. S.; Ray, C. E. (1982). North American Eocene sea cows (Mammalia: Sirenia). Smithsonian Contributions to Paleobiology Number 52. Smithsonian Institution Press, Washington, D.C.
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