4 genera are assigned to the class PARABLASTOIDEA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| uncertain | Blastocystis | O | Aren-u | O | Aren-u |
| uncertain | Blastoidocrinus | O | Aren-l | O | Llde-u |
| uncertain | Cambroblastus | Cm | Fran | O | Llde |
| uncertain | Meristoschisma | O | Cara-l | O | Cara-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).