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'''Nemertea''' is a [[phylum]] of [[animal]]s also known as '''ribbon worms''' or '''proboscis worms''', consisting of about 1300 known species.<ref name="ITIS">{{ITIS |id=57411 |taxon=Nemertea |access-date=February 18, 2011}}</ref><ref>{{cite journal | url=https://www.nature.com/articles/d41586-022-01484-7 | doi=10.1038/d41586-022-01484-7 | title=A poisonous shield, a potent venom: These worms mean business | journal=Nature | year=2022 | volume=606 | issue=7913 | page=230 | bibcode=2022Natur.606R.230. | s2cid=249434440 }}</ref> Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many have patterns of yellow, orange, red and green coloration.
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Under the skin are usually at least three layers of muscles, some circular and some longitudinal. The mouth is [[ventral]] and a little behind the front of the body.
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