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Note: Do not rely on this information. It is very old.
Achaetae
Achaetae those Gephyreans, or spoon worms, not provided with bristles; it includes the commonest members of that class, such as the Sipunculidae.
Achaetae those Gephyreans, or spoon worms, not provided with bristles; it includes the commonest members of that class, such as the Sipunculidae.