| Scientific Name | Author | English Name |
|---|---|---|
| Encope aberrans | Martens, 1867 | |
| Encope emarginata | (Leske, 1778) | |
| Encope grandis | Agassiz, 1841 | Giant keyhole sand dollar |
| Encope michelini | Agassiz, 1841 | Notched sand dollar |
| Encope micropora | Agassiz, 1841 | |
| Encope perspectiva | Agassiz, 1841 | |
| Lanthonia longifissa | (Michelin, 1858) | |
| Leodia sexiesperforata | (Leske, 1778) | Six holed keyhole urchin |
| Mellita quinquiesperforata | (Leske, 1778) | Keyhole sand dollar |
| Mellitella stokesii | (Agassiz, 1841) |