3 genera are assigned to the class TUNICATA

OrderGenusFOPFOSLOPLOS
uncertainCystodytesTEo-lR 
uncertainMicraseitesTEo-m-lR 
uncertainPermosomaPLeon-uPLeon-u

Search Again
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).