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Sculpture (mollusc) Sculpture is a feature of many of the shells of mollusks. It is three-dimensional ornamentation on the outer surface of the shell, as distinct from either the basic shape of the shell itself or the pattern of colouration, if any. Sculpture is a feature found in the shells of gastropods, bivalves, and scaphopods.
Lissachatina fulica is a species of large land snail that belongs in the subfamily Achatininae of the family Achatinidae. [ 1 ] It is also known as the Giant African land snail. [ 2 ] It shares the common name "giant African snail" with other species of snails such as Achatina achatina and Archachatina marginata.
Variety of Mollusc shells (gastropods: land snail shells and seashells). Closed and open shells of a marine bivalve, Petricola pholadiformis. A bivalve shell is composed of two hinged valves which are joined by a ligament. Four views of a shell of the land snail Arianta arbustorum The giant clam (Tridacna gigas) is the largest extant species of ...
Shell description. The thick, ovate to slightly elongated shells are coarsely sculptured, resembling the triton shells of the Ranellidae. The intersection of the spiral ribs and the axial sculpture results in a strong nodulose pattern of more or less round knobs. This warty surface gave them their common name - frog shells.
A group of shells belonging to various species of cone snails. Cone snails, or cones, are highly venomous sea snails of the family Conidae. [ 1 ] Fossils of cone snails have been found from the Eocene to the Holocene epochs. [ 2 ] Cone snail species have shells that are roughly conical in shape. Many species have colorful patterning on the ...
The body whorl is carinated at the periphery and flat beneath. The color of upper surface consists of longitudinal stripes or flames of brown, purplish, magenta, rose or coral red on a ground of white, corneous, pink or olive-tinted. The flames occupy more space than the ground color or vice versa. Sometimes the coloration consists of very ...
Trochus imperialis Gmelin, 1791. Astraea heliotropium, common name the sunburst star turban or the circular saw shell, is a large sea snail, a marine gastropod mollusc of the family Turbinidae, the turbans and star snails. [3] This large species was brought to Europe for the first time by the famous Captain Cook. [4]
A shell of Rochia nilotica on display at the Museo Civico di Storia Naturale di Milano. The length of the shell varies between 50 mm and 165 mm, its diameter between 100 mm and 120 mm. [4] The large, ponderous, shell has a conical shape, appearing subperforate.