Common name: Sand Dollars

Clypeasteroida is an order of echinoderms that includes the well-known sand dollars and sea biscuits. These invertebrates are characterized by their flattened, disk-like bodies and intricate patterns. In the reef aquarium, they are appreciated for their unique appearance and their role as detritivores, helping to clean up organic waste. They are generally peaceful and can coexist with a variety of tank mates. However, they require a sandy substrate to burrow and sift through for food, and care should be taken to ensure they are not outcompeted for food by more aggressive feeders.

1. 
   Common name: Sand Dollar

   Scientific name: Clypeaster humilis
2. 
   Common name: Sand Dollar

   Scientific name: Clypeaster reticulatus
3. Common name: sea biscuit

   Scientific name: Clypeaster rosaceus
4. 
   Common name: sand dollar

   Scientific name: Clypeaster subdepressus
5. 
   Common name: Eccentric sand dollar

   Scientific name: Dendraster excentricus
6. 
   Common name: Sand Dollar

   Scientific name: Encope emarginata
7. Common name: Sculpsitechinus auritus

   Scientific name: Sculpsitechinus auritus