Common name: Eccentric sand dollar

General information

The Sand Dollar, specifically the Eccentric Sand Dollar (Dendraster excentricus), is a fascinating echinoderm that is popular among marine enthusiasts. Unlike the typical sea urchins, sand dollars have a flattened, disk-like shape, which aids in their burrowing lifestyle. The Eccentric Sand Dollar is particularly known for its unique pattern of flower-like petaloid ambulacra on the upper surface.

Care

In the aquarium, Dendraster excentricus requires a tank with a deep sand bed to mimic its natural burrowing behavior. Stable water conditions are crucial, and care should be taken to avoid rapid changes in water parameters. They feed on microorganisms and detritus, so a mature tank with an established microfauna is beneficial.

Reproduction

Sand Dollars reproduce by releasing eggs and sperm into the water column, a process known as broadcast spawning. In the aquarium, this behavior is rare, and successful breeding is not commonly achieved by hobbyists.

Habitat

Eccentric Sand Dollars are found in the subtidal zone, often in large aggregations. They prefer sandy or muddy substrates where they can burrow and feed. Their range extends along the Pacific coast of North America, from Alaska to Baja California.