8 genera are assigned to the class SOMASTEROIDEA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| GONIACTINIDA | Ampullaster | O | Trem-u | O | Trem-u |
| GONIACTINIDA | Archegonaster | O | Aren-u | O | Llvi |
| GONIACTINIDA | Archophiactis | O | Ashg | O | Ashg |
| GONIACTINIDA | Chinianaster | O | Aren-l | O | Aren-l |
| GONIACTINIDA | Lepidasterina | D | Fras | D | Fras |
| GONIACTINIDA | Ophioxenikos | O | Aren-l | O | Aren-l |
| GONIACTINIDA | Stuertzura | S | Ludl | S | Ludl |
| GONIACTINIDA | Villebrunaster | O | Aren-l | O | Aren-l |
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FOP = Period of first occurrence
FOS = Stage of first occurrence
LOP = Period of last occurrence
LOS = Stage of last occurrence
Stage abbreviations follow Sepkoski (2002).