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A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods. In textbook illustrations of gastropod shells, the tradition (with a few exceptions) is to show most shells with the spire uppermost on the page.
This shell has nine whorls. A whorl is a single, complete 360° revolution or turn in the spiral or whorled growth of a mollusc shell. A spiral configuration of the shell is found in numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the ammonites.
In gastropods, the body whorl, or last whorl, [1] is the most recently formed and largest whorl (or revolution) of a spiral or helical shell, terminating in the aperture.It is called the "body whorl" because most of the body of the soft parts of the animal fits into this whorl.
In histopathologic architecture, a whorled pattern consists of multiple concentric objects, or a spiral-shaped pattern. Bone tissue is shown. For mollusc whorls , the body whorl in a mollusc shell is the most recently formed whorl of a spiral shell, terminating in the aperture.
Parallel – Having the same relative distance in all parts, as when the spiral lines in univalve shells are the same distance apart all the way around. [1] Patelliform – Shaped like a flattened-out cone, as an Ancylus. [1] Patulous – Open and spreading, as the aperture in some gastropods. [1] Paucispiral – Only slightly spiral, as some ...
Most species of wentletrap are white, and have a porcelain-like appearance. They are notable for their intricately geometric shell architecture, and the shells of the larger species are prized by collectors. The more or less turret-shaped shell consists of tightly-wound (sometimes loosely coiled), convex whorls, which create a high, conical spiral.
The inner layers of the shell are composed of a network of calcium carbonate, conchin, and different mineral salts. The mantle produces the shell through addition around a central axis called the columella, causing a spiraling pattern. [10] The spiraling patterns on a snail’s shell are known as coils or whorls. Whorl size generally increases ...
The largest height of any shell is found in the marine snail species Syrinx aruanus, which can be up to 91 cm. [14] The central axis is an imaginary axis along the length of a shell, around which, in a coiled shell, the whorls spiral. The central axis passes through the columella, the central pillar of the shell.