The Order Echiuroinea is further organized into finer groupings including:
- Family (2): Bonelliidae · Echiuridae
- Species: ZipcodeZoo has pages for 153 species and subspecies in the Order Echiuroinea.
At least 113 species and subspecies belong to the Family Echiuridae.
More info about the Family Echiuridae may be found here.
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