Biology/Natural History: Pointed tube feet without suckers are common on seastars which live on sand instead of rocks. This species seems very fragile--I have captured a number of specimens by otter trawl but all have been fragmented. This star is reported to eat the sea cucumber Cucumaria miniata.

This species burrows. It has a very leaky outer surface, and allows seawater fluids to pass readily through its surface. However, it tends to be hyperosmotic. It appears to make extensive use of seawater intake through its madreporite to maintain internal fluid balance (Ferguson, 1994).