''Corystosiren'' is an extinct genus of dugongid sirenian

mammal Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or ...

which existed in the waters of the Caribbean Basin during the early Pliocene. Fossils have been found in the Yucatán Peninsula, Mexico, and Florida.D. P. Domning. 1990. Fossil Sirenia of the West Atlantic and Caribbean Region, IV. Corystosiren varguezi, gen. et sp. nov. Journal of Vertebrate Paleontology 10(3):361-371

References

Pliocene sirenians Fossil taxa described in 1990 Prehistoric placental genera {{Paleo-sirenian-stub