Sea worm, also spelt seaworm, may refer to one or several of the following taxa: Taxonomic nameTypeDescriptionSize (length)Annelidaphylumsegmented wormsranges from microscopic to AplacophoraSub-phylummolluscs that look like wormsa few millimeters to several centimetersChaetognathaphylumarrow worms Cycliophoraphylumfound living attached to the bodies of lobstersless than ½ mm wideEntoproctaphylumsessile aquatic wormsranges from Gastrotrichaphylumpseudocoelomate wormsGnathostomulidaphylumjaw wormsHemichordataphylumdeuterostome wormsa few centimeters to 2,5 meters Kinorhynchaphylum pseudocoelomate invertebrates, widespread in mud or sand at all depths1 mm or lessLoriciferaphylumsediment-dwelling worms100 μm to ca. 1 mmMicrognathozoasuperphylumdiscovered living in homothermic springsNematodaphylumround wormsranges from microscopic to , and some parasitic ones reaching over Nematomorphaphylumparasitic wormsNemerteaphyluminvertebrate ribbon wormsmost are less than long, one specimen has been estimated at Phoronidaphylumhorseshoe worms, the largest are PlatyhelmintheaphylumflatwormsPriapulidaphylumpenis worms, general shape may recall the shape of a penisSipunculaclasspeanut worms, a group of unsegmented marine annelidsTeredinidaefamilyshipworms, which are marine bivalve molluscs several inches to five feet.Xenoturbellidasubphylumbilaterian worm-like speciesup to
See also Marine worm
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