Nemerteans (nem-er -te-ans) are often called ribbon worms. Their name (Gr. Nemertes, one of the Nereids, unerring one) refers to the unerring aim of the proboscis, a long muscular tube and that can be thrust out swiftly to grasp their prey. The phylum is also called Rhynchocoela (ring -ko-se -la) …
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