Prostrate Urchin (Clypeaster prostratus)

Also known as Biscuit Urchin, Cake Urchin, Heart Urchin, Sand Dollar, Sea Biscuit

Description

Also know as Biscuit Urchin, Cake Urchin, Heart Urchin, Sand Dollar, Sea Biscuit.

Found singly or in vast numbers during the day buried, partially buried or on the sand in shallow areas of coral and rocky reefs.
They feed nocturnally on micro organisms in the sand.
Length - 13cm
Depth - 0-75m
Worldwide

Sea Urchins use tubed feet to get around, often in large impenetrable masses for protection.
Sometimes they hitch a lift on the back of crabs.
They have well developed jaws for grinding their prey.
Their anus is on top in most sea urchins, except the heart urchins where it is at the rear.
Predators of sea urchins are triggerfish and large wrasses, who nibble away at their spines before turning them over to eat the fleshy undersides.
Sea Urchins are highly venomous and can piece through a wet-suit.
Some are sensitive to light and have the ability to shoot venom loaded spines at a short distance.
To be avoided!! Ref: https://en.wikipedia.org/wiki/Clypeaster

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