Crossword clues for dugongidae dugongidae A family of mammals of order Sirenia including dugongs and Steller's sea cow Wikipedia Dugongidae The Dugongidae are a family in the order of Sirenia. The family has one surviving species, the dugong (Dugong dugon), one recently extinct species, Steller's sea cow (Hydrodamalis gigas), and a number of extinct genera known from fossil records.