The radula is an anatomical structure found in molluscs and used for feeding. It is a minutely toothed, chitinous ribbon. It is typically used for scraping or cutting food before the food enters the esophagus. The radula is unique to the molluscs, and is found in all clades of mollusks except for the bivalves.
Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs. The arrangement of teeth on the radula ribbon varies considerably however from one group to another.
In most of the more ancient lineages of gastropods, the radula is used to graze and scrape diatoms and other microscopic algae off rock surfaces and other substrata.
References[]
- Molluscan buccal structures and radula
- A Comparison of the feeding behaviour and the functional morphology of radula structure in Nudibranchs
- Hickman Carole, S (1980). "Gastropod Radulae and the Assessment of Form in Evolutionary Paleontology". Paleobiology 6 (3): 276–294.
- Amélie H. Scheltema, Klaus Kerth, Alan M. Kuzirian (April 2006). "Original molluscan radula: Comparisons among Aplacophora, Polyplacophora, Gastropoda, and the Cambrian fossil Wiwaxia corrugata". Journal of Morphology 257 (2): 219–245. doi:. http://www3.interscience.wiley.com/cgi-bin/abstract/104528759/ABSTRACT?CRETRY=1&SRETRY=0.