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(invertebrate zoology)
A filelike ribbon studded with horny or chitinous toothlike structures, found in the mouth of all classes of mollusks except Bivalvia.



an apparatus in mollusks, except bivalves, that rasps off and tears up food. The radula consists of a chitinous basal ribbon that lies on the surface of the tongue, the muscular out growth of the ventral wall of the pharynx. It is covered with cross rows of numerous, up to 75,000, chitinous teeth, the number, shape, and position of which serve as taxonomic criteria. The radula works like a dredge equipped with scoops. Its main function is to allow the mollusk to rasp off the food, which is then swallowed.

References in periodicals archive ?
Many subsequent authors perpetuated Lamarck's misidentification, until Clench and Turner (1964) described the radular morphology and properly distinguished both taxa.
Diffferentiation in radular and embryonic characters, and further comments on gene flow, between two sympatric morphs of Littorina saxatilis (Olivi).
52); m9a, much more developed, about as wide as m4, broadly covering radular nucleus (Figs 52, 53).
Distribution and radular morphology of various nudibranchs (Gastropoda: Opisthobranchia) from the Gulf of California.
In GKL with an SL of ~2 mm, the teeth are larger, the rachidian tooth no longer has a triangular tip and lies flat along the radular ribbon except for a curled cusp.
I use the term buccal mass to refer to both the buccal cavity and the radular apparatus (radular sac, radular teeth, and the muscles and sometimes cartilages that facilitate functioning of the radular apparatus).
Patterns of radular tooth structure in carnivorous land snails.
To test the hypothesis that Choneplax lata was the source of the grazing, we compared the mosaic pattern of scars on Porolithon pachydermum with the radular morphology of C.
For any species of gastropod, the length of radular ribbon will be a result of a dynamic balance between the production of rows of teeth verses the wear and shedding of older teeth (Runham & Thornton 1967, Padilla et al.
Two neurons of the buccal ganglia, which innervate radular tensor muscle groups (Kater, 1974; Zoran et al, 1989), were primarily used for these studies: buccal neurons B19 and B110.