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The radula (US: / ˈ r æ dʒ ʊ l ə /; pl.: 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 esophagus .
The radula is more similar to coleoids, with 9 elements per row, than to the nautilus, with 13 elements per row. Ammonoids have been found with coleoid-like radulas, as have orthoconic nautiloids dating back to the Ordovician Period (Gabbott, 1999).
radula; odontophore; hepatopancreas = digestive gland diverticulum (mollusc) style (zoology) Respiratory system of gastropods. ctenidium (mollusc) cerata. cnidosac; pneumostome; siphon (mollusc) circulatory system of gastropods; excretory system of gastropods. pseudofeces; reproductive system of gastropods. apophallation; Love dart
Cephalopods are primarily predatory, and the radula takes a secondary role to the jaws and tentacles in food acquisition. The monoplacophoran Neopilina uses its radula in the usual fashion, but its diet includes protists such as the xenophyophore Stannophyllum. [45]
The cephalopod radula consists of multiple symmetrical rows of up to nine teeth [101] – thirteen in fossil classes. [102] The organ is reduced or even vestigial in certain octopus species and is absent in Spirula . [ 102 ]
Diverticulum – A pouch or hole, as the pouch containing the radula, or that containing the dart in helices. [1] Dormant – In a state of torpor or sleep. [1] Dorsal – The back. In gastropods the opposite to the aperture. [1] Ectocone – The outer cusp on the teeth of the radula. [1] Edentulous – Without teeth or folds, as the aperture ...
The buccal mass is the first part of the digestive system, and consists of the mouth and pharynx. The mouth includes a radula, and in most cases, also a pair of jaws. The pharynx can be very large, especially in carnivorous species. Many carnivorous species have developed a proboscis, containing the oral cavity, radula, and part of the ...
U. chinesis is a cephalopod which means that it feeds by using tentacles to pull food into its sharp beak. Cephalopods have radula's which are similar to tongues that help them grind up the food they eat so they can digest it. Reproduction occurs once in a lifetime because cephalopods die shortly after reproducing.