| Scientific Name | Author | English Name |
|---|---|---|
| Spatangus multispinus | Mortensen, 1925 | Purple-heart urchin |
| Spatangus purpureus | unspecified | Violet heart urchin |
| Spatangus mathesoni | McKnight, 1968 | Matheson’s heart urchin |
| Spatangus californicus | Clark, 1917 | California heart urchin |
| Spatangus inermis | Mortensen, 1913 | |
| Pseudomaretia alta | (Agassiz, 1863) | |
| Nacospatangus laevis | (Clark, 1917) | |
| Nacospatangus interruptus | (Studer, 1880) | |
| Nacospatangus alta | (Agassiz, 1863) | |
| Nacospatangus depressus | Clark, 1917 | |
| Maretia planulata | (Lamarck, 1816) | |
| Maretia cordata | Mortensen, 1948 | |
| Gymnopatagus magnus | Agassiz & Clark, 1907 |