2 genera are assigned to the class PARATRILOBITA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| uncertain | Onega | V | u | V | u |
| uncertain | Parvancorina | V | u | V | u |
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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).