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A typical radula comprises a number of bilaterally-symmetrical self-similar rows of teeth rooted in a radular membrane in the floor of their mouth cavity. Some species have teeth that bend with the membrane as it moves over the odontophore, whereas in other species, the teeth are firmly rooted in place, and the entire radular structure moves as one entity.
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. The odontophore is part of the feeding mechanism in molluscs. It is the cartilage which underlies and supports the radula, a ribbon of teeth. [1] The radula is found in every class of molluscs except for the ...
They have a number of anatomical peculiarities. The structure of the radula of these snails (their "teeth") is unusual. Essentially, haplotrematids have fewer cusps than most snails, but they are considerably elongated, suitable for the predatory life they follow.
The radula is typically taenioglossate with one central (rachidian) tooth, with on each side one lateral tooth and two marginal teeth. In 13 species the number of tooth rows increases during growth (Type I), while in 8 species the radula has a limited number of tooth rows (Type II).
Stylommatophora is the most diverse group of land snails and slugs. Pallial cavity forms a spacious, air-filled lung. Anus is located on the right side close to the pneumostome. Operculum is missing. Two pairs of tentacle are retractable and the posterior pair bears eyes on the tips. Radula typically has many small, quite uniform teeth per row.
Typically, it is a small, strong, ribbon-like structure that bears numerous complex rows of tiny teeth across it. In the Kerry slug, the radula is 8 mm (5 ⁄ 16 in) long and 2 mm (1 ⁄ 16 in) wide, and has 240 slightly curved, transverse rows of denticles; tiny teeth. Each row of teeth is composed of one median tooth and 10 lateral and ...
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.
The radula has the rhachidian and 4 to 5 lateral teeth with irregularly oval body, and rather long, pointed cusps, their outer edges serrate. The inner marginal teeth are enlarged. The pseudo-proboscis of the animal is well developed [2] [3]