The ambulacral areas on the aboral surface are characteristically shaped like petals and are at least two-thirds the width of the test.

The oral (under) surface is concave or cup-shaped, with the food grooves being indistinct and only slightly indented.

Live specimens are yellowish-grey, often with darker markings, while bare tests are whitish.

[2] The tube feet emerge through widely spaced pairs of pores and are used in respiration.

Its range extends from the Red Sea to Hawaii and from Taiwan to New Caledonia, but it does not occur in Australia.