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The Scotch bonnet (Semicassis granulata) is a medium-sized to large species of sea snail, a marine gastropod mollusk in the subfamily Cassinae, the helmet shells and bonnet shells. The common name "Scotch bonnet" alludes to the general outline and color pattern of the shell, which vaguely resemble a tam o' shanter , a traditional Scottish ...
A seashell or sea shell, also known simply as a shell, is a hard, protective outer layer usually created by an animal or organism that lives in the sea. Most seashells are made by mollusks, such as snails, clams, and oysters to protect their soft insides. [1] Empty seashells are often found washed up on beaches by beachcombers.
Shells may sometimes be confused with Thais haemostoma, but are paler and fatter (Yankson and Kendall, 2001). Rotula sp. (Echinodermata: West African sand dollar) have the appearance of flattened sea urchin. They are circular to heart shaped in outline and little more than the thickness of a coin in depth. A mat of flat lying spines covers them.
Oliva porphyria, common name the tent olive, is a species of sea snail, a marine gastropod mollusk in the family Olividae, the olives. [2] Its shell pattern has been studied as an example of a Turing pattern that can be modeled with cellular automata .
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The shells are small to rather large (diameter of base without attachments 19–160 mm; height of shell 21–100 mm), depressed to conical, with narrow to wide, simple to spinose peripheral edge or flange separating spire from base. Aperture large, base broad, rather flattened, often umbilicate. Periostracum very thin or wanting.
This results in different areas growing at different rates, and thus a coiling of the shell and a change in its shape - its convexity, and the shape of the opening - in a predictable and consistent fashion. [31] The shape of the shell has an environmental as well as a genetic component; clones of gastropods can exert different shell morphologies.