| Arten | Unterarten | Artenschutzstatus | Verbreitung, Populationsgröße |
| S. ater | | endangered / not listed in WA | Mexico, USA |
| S. hispidus | | endangered / not listed in WA | Angle Island, Baja California, Mexico |
| S. klauberi | | endangered / not listed in WA | Santa Catalina, Baja California, Mexico |
| S. obesus | | endangered / not listed in WA | Baja California |
| S. slevini | | endangered / not listed in WA | Isla Monserrate, Baja California, Maxico |
| S. varius | | Endangerd Cites 1 | San Estban, Baja California, Mexico |