11 genera are assigned to the class PALAEOSCOLECIDA

OrderGenusFOPFOSLOPLOS
uncertainBohemoscolexOlOl
uncertainCowiellaCmAtda-uCmAtda-u
uncertainGammascolexOlOl
uncertainHadimopanellaCmAtda-uSLdov-u
uncertainHouscolexCmAtda-uCmAtda-u
uncertainKaimenellaCmTojoCmTrep
uncertainMilaculumCmBoto-lOLlde-l
uncertainPalaeoscolecidaCmAtda-uCmAtda-u
uncertainPalaeoscolexCmAtda-uOTrem
uncertainPlasmuscolexOAren-uOAren-u
uncertainProtoscolexOCara-uOCara-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).