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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.
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. 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]
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Radular tooth (not known for fossil species) The anterior section of the radula is much longer than the posterior section. The blade is short, a basal spur is absent, and the barb is short. The radular tooth has no serrations. An accessory process is present and is a short, simple triangular terminating cusp. Geographical distribution
In paleontology, denticle characteristics such as size and density (denticles per unit distance) are used to describe and classify fossilized teeth, especially those of dinosaurs. Denticles are also present on the teeth of varanoid lizards, sharks, and mammals. [1] The term is also used to describe the analogous radular teeth of mollusks. [2 ...
Radular tooth (not known for fossil species) The anterior section of the radula is roughly equal to the posterior section. The blade is fairly long and covers at least half the length of the anterior section of the radular tooth. A basal spur is present, and the barb is short. The radular tooth has serrations and the terminating cusp is internal.
Radular tooth (not known for fossil species) The anterior section of the radular tooth is greatly elongated in comparison with the posterior section. A basal spur is absent, and the barb and blade are short. The waist is not obvious, and the radular tooth has serrations and a terminating cusp. Geographical distribution
Radular tooth (not known for fossil species) The anterior section of the radular tooth is roughly equal to the length of the posterior section, and the blade is more than half the length of the anterior section. A basal spur is present, the barb is short, and there is an internal terminating cusp. The radular tooth is serrated.