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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.
A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. 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.
Laminated – Consisting of plates or scales laid over each other. [1] Lanceolate – Gradually tapering to a point. [1] Lateral – Pertaining to the side. [1] Latticed – (See decussated.) [1] Lobulate – Composed of lobes. [1] Longitudinal – The length of a shell. [1] Lunate – Shaped like a half moon, as the aperture in some shells. [1]
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.
Shell of marine snail Lunella torquata with the calcareous operculum in place Gastropod shell of the freshwater snail Viviparus contectus with corneous operculum in place. An operculum (Latin for 'cover, covering'; pl. opercula or operculums) is a corneous or calcareous anatomical structure like a trapdoor that exists in many (but not all) groups of sea snails and freshwater snails, and also ...
The word "apex" is most often used to mean the tip of the spire of the shell of a gastropod.The apex is the first-formed, and therefore the oldest, part of the shell. [1] To be more precise, the apex would usually be where the tip of the embryonic shell or protoconch is situated, if that is still present in the adult shell (often it is lost or eroded away).
If you've been having trouble with any of the connections or words in Monday's puzzle, you're not alone and these hints should definitely help you out. Plus, I'll reveal the answers further down ...
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.