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The shell of Semicassis pyrum has a large parietal callus, at the top in this image The shell of Cymatium pileare has a narrow parietal callus around the surface of the aperture nearest the columella, on the left of the shell opening as it is shown here. A parietal callus is a feature of the shell anatomy of some groups of snails, i.e. gastropods.
Juliidae, common name the bivalved gastropods, is a family of small sea snails, marine gastropod mollusks or micromollusks in the superfamily Oxynooidea, an opisthobranch group. [ 2 ] These are sacoglossan (sap-sucking) sea snails, and many of them are green in color.
The gastropod shell is part of the body of many gastropods, including snails, a kind of mollusc. The shell is an exoskeleton , which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage.
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.
This genus is a heterogeneous assemblage. Because the shell characters of this genus converge with those of the larger specimens of some closely related genera (Saphtia Winter, 2008, [3] Pseudosaphtia Winter, 2008 [3] and Vanmolia Winter, 2008 [3]), the delimitation of * To Thapsia s.l. is difficult. There very few papers that describe the ...
Gastropods whose shells have varices are primarily families and species within the taxonomic groups Littorinimorpha and Neogastropoda. The varix is a thickened axial ridge, a subcylindrical protrusion, in the shell which exists in some families of marine gastropods. It is an important shell character in generic classification.
The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top .
Three views of a shell of Norelona pyrenaica with the apertural view in the center A shell of Semicassis pyrum, which has a large aperture and a pronounced parietal callus The aperture is an opening in certain kinds of mollusc shells : it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion ...