Dugongs & Manatees - Order Sirenia
- Dugongs - Family Dugongidae
- Dugong - Dugong dugon
- Steller's Sea Cow - Hydrodamalis gigas - Extinct
- Manatees - Family Trichechidae
- Amazon Ox Manatee - Trichechus inunguis
- West African Manatee - Trichechus senegalensis
- West Indian Manatee - Trichechus manatus