ribbon worm

ribbon worm

noun
any of various slender, unsegmented marine worms of the phylum Nemertea, being able to contract and stretch to an extreme extent.

Origin:
1850–55

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Collins
World English Dictionary
ribbon worm
 
n
another name for nemertean

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica
Encyclopedia

ribbon worm

any member of the invertebrate phylum Nemertea (sometimes called Nemertinea, or Rhynchocoela), which includes mainly free-living forms but also a few parasites of crustaceans, mollusks, and sea squirts. The majority of the approximately 900 known nemertean species are found in marine habitats. Some, however, live in freshwater or on land. The name proboscis worm derives from the muscular eversible proboscis, which is housed in a chamber above the gut. This tube-shaped organ, which in many aquatic forms has a needlelike stylet, is typically used to trap the prey; in land-dwelling species it may be used for rapid movement

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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