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This article is about animals known as worms. There is also an article about computer worms.

A worm is any of numerous relatively small elongated soft-bodied invertebrate animals. The most famous is the earthworm, a member of phylum Annelida, but there are hundreds of thousands of different species that live in a wide variety of habitats other than soil.

Originally, the word referred to any creeping or a crawling animal of any kind or size, such as a serpent, caterpillar, snail, or the like. Later this definition was narrowed to the modern definition which still includes several different animal groups. Some of these are from the phyla: Annelida, Chaetognatha, Nematoda ("roundworms"), Nemertea and Platyhelminthes ("flatworms"). Many insect larvae are also called "worms".

The night crawler (Latin name Lumbricus terrestris) is very similar to the common garden worm.

"Worm" phyla includes:

Acanthocephala - Spiny headed (Thorny headed) worms
Aeschelminthes - "round worms" (includes the phyla Nematoda, Rotifera, Gastrotricha, Kinorhyncha, Nematomorpha, and Priapulida
Annelida - Segmented worms without setae -- including earthworms
Chaetognatha -- Arrow Worms
Echiura -- Spoon Worms
Gastrotricha --
Gnathostomulida -- Jaw worms
Hemichordata -- Acorn worms (chordates)
Kinorhyncha
Nematoda -- Ribbon worms
Onychophora -- "Velvet worms" (Arthropods or close relatives thereof)
Platyhelmintha -- flatworms
Pogonophora -- Beard Worms.
Polychaeta -- segmented worms with setae
Priapulida
Sipuncula -- "Peanut Worms"
Rotifera
Urochordata - Tunicate worms (possibly chordates)
Vestimentifera

Worm is also a Nordic word for a dragon (also spelled "Wyrm").

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 A '''worm''' is any of numerous relatively small elongated soft-bodied [[invertebrate]] [[animal]]s. The most famous is the [[earthworm]], a member of [[Scientific classification|phylum]] [[Annelida]], but there are hundreds of thousands of different [[species]] that live in a wide variety of habitats other than [[soil]].
-Originally, the word referred to any creeping or a crawling animal of any kind or size, such as a  serpent, caterpillar, snail, or the like. Later this definition was narrowed to the modern definition which still includes several different animal groups.  Some of these are from the [[phyla]]; [[Annelida]], [[Chaetognatha]], [[Nematoda]] ("[[roundworm]]s"),  [[Nemertea]] and [[Platyhelminthes]] ("[[flatworm]]s"). Many [[insect]] larvae are also called "worms".
+Originally, the word referred to any creeping or a crawling animal of any kind or size, such as a  serpent, caterpillar, snail, or the like. Later this definition was narrowed to the modern definition which still includes several different animal groups.  Some of these are from the phyla: [[Annelida]], [[Chaetognatha]], [[Nematoda]] ("[[roundworm]]s"),  [[Nemertea]] and [[Platyhelminthes]] ("[[flatworm]]s"). Many [[insect]] larvae are also called "worms".
 The [[night crawler]] (Latin name ''[[Lumbricus terrestris]]'') is very similar to the common [[garden worm]].
-"Worm" [[phyla]] includes:
+"Worm" phyla includes:
 <UL>
 <LI>Acanthocephala - Spiny headed (Thorny headed) worms
-<LI>Aeschelminthes - "round worms" (includes the [[phyla]] Nematoda, Rotifera, Gastrotricha, Kinorhyncha, Nematomorpha, and Priapulida
+<LI>Aeschelminthes - "round worms" (includes the phyla Nematoda, Rotifera, Gastrotricha, Kinorhyncha, Nematomorpha, and Priapulida
 <LI>Annelida - Segmented worms without setae -- including earthworms
 <LI>Chaetognatha -- Arrow Worms