Do bivalves radula?
Bivalves are mollusks that have two shells hinged together, held by strong muscles. Clams, oysters, scallops, and mussels are bivalves. This type of mollusk does not have a radula.
What is the radula and what is its function?
The radula, part of the odontophore, may be protruded, and it is used in drilling holes in prey or in rasping food particles from a surface. It is supported by a cartilage-like mass (the odontophore) and is covered with rows of many small teeth (denticles).
What is the function of the radula in molluscs?
The radula is the anatomical structure used for feeding in most species of Mollusca. Previous studies have revealed that radulae can be adapted to the food or the substrate the food lies on, but the real, in vivo forces exerted by this organ on substrates and the stresses that are transmitted by the teeth are unknown.
Why does the class bivalvia lack a radula?
Most bivalves do not have radula because they eat by filtering water through their gills to obtain organic particles. Most bivalves attach themselves to something or burrow underground. Some scallops, however, do not attach themselves to anything and are able to swim by squirting water through their mantle.
Do cephalopods have radula?
Predatory cephalopods, such as squid, use the radula for cutting prey. The introduction of the term “radula” (Latin, “little scraper”) is usually attributed to Alexander von Middendorff in 1847.
What is the function of Osphradium?
The major function of osphradium is to test the incoming water for silt and food particles. The osphradium also acts as an olfactory organ in certain mollusks and is linked with the respiratory organ. Osphradium structure resembles the feather of a bird and is also called Bipectinate.
What is the role of radula in molluscs Class 11?
The radula is an anatomical structure used by molluscs for feeding, which is also sometimes compared to a tongue. The radula is present in the buccal cavity of a mollusc. It is a minutely toothed, chitinous ribbon, that is usually used for scraping or cutting food.
What is the difference between gastropods bivalves and cephalopods?
bivalve: Class of mollusks that use their foot to attach themselves to rocks or to burrow into mud, i.e. clams. cephalopod: Class of mollusks characterized by a set of arms or tentacles; i.e. octopus. gastropod: Class of mollusks that use their foot to crawl, i.e. snails.
How do the Chitons differ from bivalves?
Members of class Polyplacophora are better known as “chitons;” these molluscs have a large foot on the ventral side and a shell composed of eight hard plates on the dorsal side. Class Bivalvia consists of mollusks with two shells held together by a muscle; these include oysters, clams, and mussels.
Do echinoderms have radula?
All gastropods use their radula as a feeding organ; some also use the radula to burrow. Animal Diversity III: Mollusca, Echinodermata, etc. The foot in these molluscs is located in the head region (the name Cephalopoda means “head- foot”) and has become subdivided into a series of tentacles that surround the mouth.
What is a radula in molluscs?
Radula, plural radulae, or radulas, horny, ribbonlike structure found in the mouths of all mollusks except the bivalves. The radula, part of the odontophore, may be protruded, and it is used in drilling holes in prey or in rasping food particles from a surface.
What is the function of the radula in a bivalve?
…and chitinized teeth, called the radula, upon a tough membrane or ribbon underlain by a mass of compact tissue as a support and operated by musculature. In bivalves and some other mollusks the whole radular apparatus is reduced or absent. The radula is used to bite, tear, and scrape various…
What is the other name of radula?
See Article History. Alternative Titles: radulae, radulas. Radula, plural radulae, or radulas, horny, ribbonlike structure found in the mouths of all mollusks except the bivalves. The radula, part of the odontophore, may be protruded, and it is used in drilling holes in prey or in rasping food particles from a surface.
What are the characteristics of bivalves?
Characteristics of Bivalves. Bivalves have a foot, but not an obvious head. They also don’t have a radula or jaws. Some bivalves move around (e.g., scallops), some burrow into the sediment (e.g., clams) or even rocks, and some attach to hard substrates (e.g, mussels).