2. Aroyan (1990)

3. Ridgway (2011)

4. Suborder Odontoceti, Family Platanistidae
Members
“River dolphins”

5. Suborder Odontoceti, Family Iniidae
Members
“River dolphins”

6. Distinctive features Spatulate flippers Small eyes Flexible neck

7. Order Sirenia
Manatees
Dugongs

8. Manatees
Distinctive features
Bristly muzzle
‘Normal’ mouth

9. Manatees Distinctive features Paddle-shaped tail Slow moving
Feed throughout the water column

10. Dugongs Distinctive features
Modified and greatly expanded upper lip – rostral disk
Tusks – male dugongs
Cetacean-like tail flukes
Move quickly
Bottom feeders