4 genera are assigned to the class PYCNOGONIDA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| PALAEOISOPODA | Palaeoisopus | D | Emsi-l | D | Emsi-l |
| PALAEOPANTOPODA | Palaeopantopus | D | Emsi-l | D | Emsi-l |
| PANTOPODA | Palaeothea | D | Emsi-l | D | Emsi-l |
| PANTOPODA | Pentapalacopycon | J | Kimm | J | Kimm |
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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).