Trichechus Linnaeus, 1758 . Syst. Nat., 10th ed., 1:34.

TYPE SPECIES: Trichechus manatus Linnaeus, 1758 .

SYNONYMS: Halipaedisca, Manatus, Oxystomus.

COMMENTS: Revised by Hatt (1934a); evolutionary history summarized by Domning (1982).