| Blue sea star (Linckia) | |
| Blue sea star (Phataria) | |
| Bradley's sea star | |
| Chocolate chip sea star | |
| Cushion star | |
| Panamic Cushion star | |
| Pyramid sea star | |
| Sunflower star | |
| True star |
| Eucidaris thouarsii | |
| Eucidaris tribuloides | |
| Green sea urchin | |
| Hat-pin sea urchin | |
| West Indian sea egg | |
| White sea urchin | |
| Urchin tests | |
| Galápagos sand dollar | |
| Ocherous sea biscuit |