A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in of numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the ammonites.
The number of whorls which exist in an adult shell of a particular species depends on mathematical factors in the geometric growth, as described in D'Arcy Wentworth Thompson's classic 1917 book On Growth and Form, and by David Raup. The main factor is how rapidly the conical tube expands (or flares-out) over time. When the rate of expansion is low, such that each subsequent whorl is not that much wider than the previous one, then the adult shell has numerous whorls. When the mathematical factors governing the pattern of growth are such that there is a very rapid expansion of the conical shape, of the shell tube, then the adult shell has very few whorls.
The number of whorls present in an adult shell differs greatly in various taxa. The extant marine gastropod families Turritellidae and Terebridae, and the extinct Mesozoic family Nerineidae, have very high spired shells with a large number of whorls, and a relatively small aperture.
The shells of a few genera of gastropods, and of the cephalopod genus Spirula, have whorls that are disconnected.
The shell of the marine gastropod Haliotis asinina has fewer than two whorls
The shell of Spirula spirula has disconnected whorls
Counting the number of whorls
To count exactly the number of whorls in gastropods a straight line is drawn to separate the semi-circular nucleus (protoconch (1 - see image) from the younger part of the shell. An arrow placed at a 90° angle on this line, following the course of the whorl, reaches the end of the first whorl where it is parallel to its starting position. From that point all whorls are counted towards the margin of the shell, estimating the ultimate whorl with an accuracy of a quarter whorl.
- Apical whorls—the whorls near the apex or tip of the shell of gastropods
- Body whorl—The most recently formed whorl of a spiral shell, in which most of the body of the animal is found
- Nuclear whorl(s)—small, generally smooth whorls formed within the egg, and constituting the apex of the shell
- Protoconch—a larval shell of a mollusc; also refers to protoconch whorls of an adult shell
- Teleoconch—all the whorls of a shell after the protoconch whorls
- Nepionic whorls : the whorls immediately following the embryonic whorls.
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