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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.
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
Radular tooth (not known for fossil species) The anterior section of the radula is usually shorter than posterior section. The blade is moderately long and covers at least one-half the length of the anterior section of the radular tooth. A basal spur is present, the barb is short. Serrations usually occur in just one or two rows.
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 radula has an elongated anterior section with serrations and a large exposed terminating cusp, a non-obvious waist, blade is either small or absent and has a short barb, and lacks a basal spur. Geographical distribution These species are found in the Indo-Pacific region. Feeding habits
Drawing of selected radular teeth of Clappia umbilicata: central tooth, lateral tooth, inner marginal tooth and outer marginal tooth. Somatogyrus umbilicatus n. sp. Pl. v, fig. 5. Shell small, globosely depressed, umbilicate, light greenish-yellow, smooth, except for the fine, rather unequal, lines of growth. Spire short, obtusely elevated.
Unlike other Aeolidida, the family Aeolidiidae possesses radular teeth which aid in feeding on their prey (See Fig. 2). [7] The radula is a feature in majority of mollusks located in the mouth, like a tongue, containing thousands of teeth that help cut up food for digestion by scraping against rocks or even Fig. 2 A. papillosa Radular Teeth
Diagram of tooth anatomy. Dental anatomy is a field of anatomy dedicated to the study of human tooth structures. The development, appearance, and classification of teeth fall within its purview. (The function of teeth as they contact one another falls elsewhere, under dental occlusion.)