One genus is assigned to the phylum ECHIURIDA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| uncertain | Coprinoscolex | C | Mosc-u | C | Mosc-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).