Urchins
West Coast
| Scientific name | common name | season | found | temperature |
| Stronglyocentrotus purpuratus | purple sea urchin (1" to 4") |
late Nov to June | inter-tidal to sub | 10-15 °C |
| Stronglyocentrotus franciscanus | red sea urchin (3" to 8") |
late Nov to June | low inter-tidal to sub | 10-15 °C |
| Lytichinus pictus | white sea urchin (3/4" to 1½") |
May to Sept. | sub-tidal | 12-20 °C |
East Coast
| Scientific name | common name | season | found | temperature |
| Arbacia punctulata | purple sea urchin (1" to 1½") |
June to August | sub-tidal? | 15-25 °C |
| Stronglyocentrotus drobachiensis | green sea urchin (1-3") |
November to March | sub-tidal? | ? |
Gulf Coast
| Scientific name | common name | season | found | temperature |
| Arbacia punctulata | purple sea urchin (1" to 1 ½") |
June to August | sub-tidal? | 15-25 °C |
Tip: L. pictus (west) and A. punctulata (east) are used to warmer temperatures. These species will develop at normal room temperature and are very useful when you do not have an incubator or way of keeping the cultures cool.