11 genera are assigned to the class MEROSTOMOIDEA
| Order | Genus | FOP | FOS | LOP | LOS |
|---|
| CHELONIELLIDA | Cheloniellon | D | Emsi-l | D | Emsi-l |
| EMERALDELLIDA | Ecnomocaris | Cm | uMid-l | Cm | uMid-l |
| EMERALDELLIDA | Emeraldella | Cm | mMid-u | Cm | mMid-u |
| EMERALDELLIDA | Thelxiope | Cm | mMid-u | Cm | mMid-u |
| INCERTAE SEDIS | Fuxianhuia | Cm | Atda-u | Cm | Atda-u |
| INCERTAE SEDIS | Helmetia | Cm | mMid-u | Cm | mMid-u |
| INCERTAE SEDIS | Kuamaia | Cm | Atda-u | Cm | Atda-u |
| INCERTAE SEDIS | Nathorsthia | Cm | mMid-u | Cm | mMid-u |
| INCERTAE SEDIS | Retifacies | Cm | Atda-u | Cm | Atda-u |
| LIMULAVIDA | Amiella | Cm | mMid-u | Cm | mMid-u |
| LIMULAVIDA | Sidneyia | Cm | mMid-u | Cm | uMid-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).