In biology, the nemerteans are aquatic worms that belong to the phylum (or Phylum) Nemertina, also called Rhynchocoela or Nemertea. There are approximately about 1200 species and mostly marine. You want to say about Nemertes or belonging to Nemertes (Nemertes was the name of one of the Nereids, the nymph of the sea).
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