
Herbert notes in Dune that microscopic creatures called sand plankton feed upon traces of melange scattered by sandworms on the Arrakeen sands. The quasi-canonical Dune Encyclopedia invents a scientific name for the sandworm: Geonemotodium arraknis (also Shaihuludata gigantica). Sandworms are described as "incredibly tough" by Liet-Kynes, who further notes that "high voltage electrical shock applied separately to each ring segment" is the only known way to kill and preserve them atomics are the only explosive powerful enough to kill an entire worm, with conventional explosives being unfeasible as "each ring segment has a life of its own." Water is poisonous to the worms, but is in too short supply on Arrakis to be of use against any but the smallest of them. These gigantic worms burrow deep in the ground and travel swiftly "most of the sand on Arrakis is credited to sandworm action." Sandworms grow to hundreds of meters in length, with specimens observed over 400 meters (1,312 ft) long and 40 meters (131 ft) in diameter, although Paul becomes a sandrider by summoning a worm that "appeared to be" around half a league (2,778 meters) or more in length. (Arabic شَؾْء خُلُود shay' khulūd means "a thing of eternity".)Ī giant sandworm seeks to devour an Ornithopter, in the Dune miniseries (2000). The worms may also be referred to by Fremen as Shaitan (Arabic الشيطان means "The Devil" (Iblīs) ), post God-Emperor. Virtually indestructible and with indefinite lifespans of potentially thousands of years, the giant sandworms are also referred to as the "Old Man of the Desert", "Old Father Eternity" and "Grandfather of the Desert".

In the series, the sandworms - called Shai-Hulud / ˈ ʃ aɪ h ᵿ ˈ l uː d/ among the Fremen of the desert planet Arrakis (Dune) - are worshiped as manifestations of "the earth deity of Fremen hearth superstitions." The Fremen believe that the actions of the sandworms are the direct actions of God, and so the worms have been given numerous titles such as the "Great Maker", "The Maker", and the "Worm who is God."( God Emperor of Dune).

They first appear in the 1965 novel Dune, considered to be among the classics in the science fiction genre, and are iconic of the Dune series. Sheeana stands before a sandworm, from the cover of Heretics of Dune (1984)Ī sandworm is a fictional form of desert-dwelling creature from the Dune universe created by Frank Herbert.
