CorystosirenCorystosiren is an extinct genus of dugongid sirenian mammal which existed in the waters of the Caribbean Basin during the Early Pliocene. Fossils have been found in the Yucatán Peninsula, Mexico, and Florida.PalaeobiologyPalaeoecologyCorystosiren varguezi, based on its high δ13C values, was a specialist that fed primarily on seagrasses.