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(phylum or class Priapulida), any of some 15 species of predatory, marine, mud-inhabiting, unsegmented worms of uncertain classification. Sometimes considered a class of the phylum Aschelminthes, priapulids are perhaps best considered to be a very small phylum with no clear relationship to any other. The largest of the priapulids are 10 to 15 cm (4 to 6 inches) long and inhabit the colder seas, while the smallest, several millimetres long, inhabit warmer seas

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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