Hippocampus

The strange beasts known as hippocampi resemble terrestrial horses from head to midbody, but on their legs, they have splayed fins instead of hooves, and in place of horses' hindquarters, they have powerful tails resembling those of fish. Hippocampi have colorful scales ranging from pearly white to seaweed green, and brilliant ribbed dorsal fins as manes.

Giant Hippocampus (Creature 8), Hippocampus (Creature 1)