what is radula sac? phylum mollusca ....plz do fast
Answers
Most Mollusks (with the exception of bivalves) have a specialized feeding organ within the mouth called the radula. ... Inside this cavity is the radula sac which protects the mouth when the radula is not in use. Supporting the radula is a structure of cartilage called the odontophore.
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Explanation:
The radula (/ˈrædʊlə, ˈrɑː-/; plural radulae or radulas)[1] is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue.[2] It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the oesophagus. The radula is unique to the molluscs, and is found in every class of mollusc except the bivalves, who use instead cilia, waving filaments that bring minute organisms to the mouth.
Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs. The arrangement of teeth (denticles) on the radular ribbon varies considerably from one group to another.
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. Other predatory marine snails, such as the Conidae, use a specialized radular tooth as a poisoned harpoon. Predatory pulmonate land slugs, such as the ghost slug, use elongated razor-sharp teeth on the radula to seize and devour earthworms. 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.[3]
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