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A small phylum that comprises the peanut worms. Also called Sipunculida.‘The phylum Sipuncula (acorn worms) has been considered allied to the molluscs on the basis of a pattern of cells in early spiral cleavage of the embryo, known as the molluscan cross.’‘Comparison of both the inferred amino acid sequences and the gene arrangements of a variety of diverse metazoan taxa reveals that the phylum Sipuncula is more closely related to Annelida than to Mollusca.’
Modern Latin (plural), from Sipunculus (genus name), based on a variant of Latin siphunculus ‘small tube’.
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