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Differences between the Pilidiophora and Hoplonemertea anatomies. Top: The mouth opening of Pilidiophora and Palaeonemertea is separated from the proboscis, whereas a common opening is the case for Hoplonemerteans. Bottom: The hoplonemertean proboscis (in circle) contains a stylet (or several in the case of Polystilifera) by which a prey epithelium can be punctured. Photography of a stylet from Amphiporus lactifloreus.
