Noun
priapulid (plural priapulids)
(zoology) Any small marine worm of the phylum Priapulida.
Crown-group priapulid body fossils are first known from the Carboniferous. Source: Internet
However, crown-group priapulids cannot be recognized until the Carboniferous. citation About 20 extant species of priapulid worms are known, half of them being of meiobenthic size. Source: Internet