The radula is an anatomical structure that is used by molluscs for feeding, sometimes compared rather inaccurately to a tongue.
Bivalve. Bivalve. 1. (Science: marine biology) a mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. Bivalve; bi- (L. Bis) _ valve valve. Please contribute to this project, if you have more information about this term feel free to edit this page. This page was last modified on 3 October 2005, at 21:16.This page has been accessed 7,992 times. The siphon of a large carnivorous marine volute, Cymbiola magnifica. A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda. In other words, a siphon is found in some saltwater and freshwater snails, in some clams, and in octopus, squid and relatives. The water flow is used for one or more purposes such as locomotion, feeding, respiration, and reproduction. The siphon is part of the mantle of the mollusc, and the water flow is directed to (or from) the mantle cavity. A single siphon occurs in some gastropods. In those bivalves which have siphons, the siphons are paired By Jennifer Kennedy. Definition: The radula is a special structure used by many molluscs to scrape food off rocks or create depressions in rocks that the mollusc uses for habitat. The radula has many rows of tiny teeth that are replaced as they wear down. One animal that has a radula is the common periwinkle, which uses its radula to scrape algae off rocks for food. Examples: The limpet is a marine invertebrate that uses its radula to create a home by boring a shallow hole into a rock. Full Definition of MOLLUSK. : any of a large phylum (Mollusca) of invertebrate animals (as snails, clams, or squids) with a soft unsegmented body usually enclosed in a calcareous shell; broadly: shellfish. — mol·lus·can also mol·lus·kan \mə-ˈləs-kən, mae-\ mä. Adjective see mollusk defined For-english language. learners Mantle of a Giant Clam. Ernest Manewal / Lonely Planet Images / Getty Images. Definition: The mantle is an important part of the body of a mollusk. It forms the outer wall of the mollusk's body and encloses the mollusk's visceral mass (internal organs, including the heart, stomach, intestines and gonads). In mollusks that have shells (e.g., clams, mussels, snails), the mantle is what secretes calcium carbonate to form the mollusk's shell. Noun. 1. biology-the science that studies living organisms. biological science. cell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals. the process of reproduction by the joining of gametes, a form of sexual reproduction. Also called zoogamy. — gamogenetic, adj. genetics. the branch of biology that studies heredity and variation in plants and animals. — geneticist, n. —  See odontophore. Please contribute to this project, if you have more information about this term feel free to edit this page. This page was last modified on 3 October 2005, at 21:16.This page has been accessed 8,630 times. The radula (plural radulae or radulas) is an anatomical structure that is used by molluscs for feeding, sometimes compared rather inaccurately to a tongue. It is a minutely toothed, chitinous ribbon, which 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 every class of mollusc except the bivalves. Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs. In most of the more ancient lineages of gastropods, the radula is used to graze, by scraping diatoms and other microscopic algae off rock surfaces and other substrates. Predatory marine snails such as the Naticidae use the radula plus an acidic secretion to bore through the shell of other molluscs.
http://www.biology-online.org/dictionary/Bivalve https://en.wikipedia.org/wiki/Siphon_%28mollusc%29 http://marinelife.about.com/od/glossary/g/radula.htm http://www.merriam-webster.com/dictionary/mollusk http://marinelife.about.com/od/glossary/g/Mantle.htm http://www.thefreedictionary.com/biology http://www.biology-online.org/dictionary/Radula https://en.wikipedia.org/wiki/Radula
radula definition biology