The Order Praecardioida is further organized into finer groupings including:
- Family (3): Antipleuridae · Butovicellidae · Praecardiidae
- Species: ZipcodeZoo has pages for 68 species and subspecies in the Order Praecardioida.
At least 32 species and subspecies belong to the Family Praecardiidae.
More info about the Family Praecardiidae may be found here.
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