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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.
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.
Tick shell Nassarius kraussianus (Dunker, R.W., 1846) (Namaqualand to Mozambique) [2] Plough shells Annulated plough shell Bullia annulata Lamarck, 1816 (Cape Columbine to Mozambique) [2] Bullia mozambicensis E. A. Smith, 1878 (KwaZulu-Natal south coast to Mozambique) [2] Pleated plough shell Bullia natalensis Krauss, C.F., 1848 (Transkei to ...
Map of the Southern African coastline showing some of the landmarks referred to in species range statements. The list of marine molluscs of South Africa is a list of saltwater species that form a part of the molluscan fauna of South Africa.
The shells have an elongated aperture in their first whorl and an inner lip characterised by a number of deep plaits. The family of Volutidae comprises a suite of large shells remarkable for their great beauty and elegance of form. The shell of species such as Melo amphora can grow as large as 50 cm (19.7 inches) in length. [2]
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.
Molluscs are a large phylum of invertebrate animals, many of which have shells. Edible molluscs are harvested from saltwater, freshwater, and the land, and include numerous members of the classes Gastropoda (snails), Bivalvia (clams, scallops, oysters etc.), Cephalopoda (octopus and squid), and Polyplacophora (chitons).