11 genera are assigned to the class PALAEOSCOLECIDA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| uncertain | Bohemoscolex | O | l | O | l |
| uncertain | Cowiella | Cm | Atda-u | Cm | Atda-u |
| uncertain | Gammascolex | O | l | O | l |
| uncertain | Hadimopanella | Cm | Atda-u | S | Ldov-u |
| uncertain | Houscolex | Cm | Atda-u | Cm | Atda-u |
| uncertain | Kaimenella | Cm | Tojo | Cm | Trep |
| uncertain | Milaculum | Cm | Boto-l | O | Llde-l |
| uncertain | Palaeoscolecida | Cm | Atda-u | Cm | Atda-u |
| uncertain | Palaeoscolex | Cm | Atda-u | O | Trem |
| uncertain | Plasmuscolex | O | Aren-u | O | Aren-u |
| uncertain | Protoscolex | O | Cara-u | O | Cara-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).