| A mostly complete trilobite from the middle Cambrian Monola Formation, Death Valley National Park. Syspacephalus Photograph courtesy Joan Corbacho. |
| A mostly complete trilobite from the middle Cambrian Monola Formation, Death Valley National Park. Syspacephalus Photograph courtesy Joan Corbacho. |
| A mostly complete trilobite from the middle Cambrian Monola Formation, Death Valley National Park. Syspacephalus. Photograph courtesy a specific online source. |