11 genera are assigned to the class MEROSTOMOIDEA

OrderGenusFOPFOSLOPLOS
CHELONIELLIDACheloniellonDEmsi-lDEmsi-l
EMERALDELLIDAEcnomocarisCmuMid-lCmuMid-l
EMERALDELLIDAEmeraldellaCmmMid-uCmmMid-u
EMERALDELLIDAThelxiopeCmmMid-uCmmMid-u
INCERTAE SEDISFuxianhuiaCmAtda-uCmAtda-u
INCERTAE SEDISHelmetiaCmmMid-uCmmMid-u
INCERTAE SEDISKuamaiaCmAtda-uCmAtda-u
INCERTAE SEDISNathorsthiaCmmMid-uCmmMid-u
INCERTAE SEDISRetifaciesCmAtda-uCmAtda-u
LIMULAVIDAAmiellaCmmMid-uCmmMid-u
LIMULAVIDASidneyiaCmmMid-uCmuMid-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).