Clypeaster australasiae, the Australasian sand dollar, is a species of sea urchins of the family Clypeasteridae.

[1][2] Clypeaster australaiae is a dark red-brown to cream coloured animal with a slightly convex upper surface and distinct markings in a flower-petal pattern.

The surface of the test is covered by a dense mat of small spines and tubercles.

The animals can be abundant in some areas, but are not often seen as they usually bury themselves in the sediment and prefer deeper water.

[2] Port Phillip Heads, Victoria, to Bowen, Queensland, and western Tasmania.