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The teeth of the radula are lubricated by the mucus of the salivary gland, just above the radula. Food particles are trapped into this sticky mucus, smoothing the progress of food into the esophagus. Certain gastropods use their radular teeth to hunt other gastropods and bivalve mollusks, scraping away the soft parts for ingestion.
The radula in this species is longer than the shell itself. It contains 1,920 teeth in 160 rows of 12 teeth each. Patella vulgata is found attached to firm substrates from the high shore to the edge of the sublittoral zone, although it predominates in areas of wave action. Its shell is conical, up to around 6 cm long, and lacks defined chirality.
Diagrammatic transverse view of the buccal cavity of a gastropod, indicating the odontophore (o). The rest of the body of the snail is shown in green. The food is shown in blue. Muscles that control the radula are shown in brown. The surface of the radula ribbon, with numerous teeth, is shown as a zig-zag line
In the most primitive gastropods, however, the stomach is a more complex structure. In these species, the hind part of the stomach, where the oesophagus enters, is chitinous, and includes a sorting region lined with cilia. [1] In all gastropods, the portion of the stomach furthest from the oesophagus, called the "style sac", is lined with cilia.
Caenogastropoda can be divided into two major groups, based on the anatomy of the radula: Taenioglossa (from taenio meaning band), equivalent to the older Mesogastropoda, with typically seven teeth in each radular row. Stenoglossa (from steno meaning narrow), the Neogastropoda, with only 1–3 teeth per row.
The long radula has a long, narrow rhachidian tooth. It is lanceolate with its tip narrowand recurved. There are 26 laterals with the outer 5 without cusps. The inner ones are larger, with wide cusps and narrower bases. The outside of the laterals consists of 2 rows of uncini (the numerous small teeth-like or hook-like structures).
Its teeth are small, mineralized, and arranged in a V-like form. Cymbula adansonii has a small rachidian tooth, which is the middle row of teeth in a gastropod’s set of radula. [6] It has a pluricuspid tooth in its radula, meaning it has several sets of cusps on one tooth. The cusps are composed of the mineral goethite and the gemstone opal.
Diverticulum – A pouch or hole, as the pouch containing the radula, or that containing the dart in helices. [1] Dormant – In a state of torpor or sleep. [1] Dorsal – The back. In gastropods the opposite to the aperture. [1] Ectocone – The outer cusp on the teeth of the radula. [1] Edentulous – Without teeth or folds, as the aperture ...