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Sea worm is a general term that may refer to a number of phyla of animals, or may refer specifically to:
- Acanthocephala, parasitic worm
- Annelida, segmented worms
- Chaetognatha, arrow worms
- Cycliophora, lobster worms
- Entoprocta, whose name means "anus inside", is a phylum of mostly sessile aquatic animals, ranging from 0.1 to 7 millimetres (0.0039 to 0.28 in) long
- Echiura, spoon worms
- Gastrotricha, microscopic
- Gnathostomulida, microscopic
- Hemichordata, a phylum of marine deuterostome animals, generally considered the sister group of the echinoderms
- Kinorhyncha, a phylum of small (1 mm or less) marine pseudocoelomate invertebrates, widespread in mud or sand at all depths, also called "mud dragons"
- Loricifera, a phylum of very small to microscopic marine sediment-dwelling animals with twenty-two described species, in eight genera
- Micrognathozoa, microscopic
- Nematoda, round worms
- Nematomorpha, parasitic worms
- Nemertea, ribbon worms
- Phoronida, horseshoe worms
- Platyhelminthea, flatworms
- Priapulida, a phylum of marine worms
- Sipuncula, peanut worms
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