Worm

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 include:

   * 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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