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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 .
Cephalopod radulae are known from fossil deposits dating back to the Ordovician. [103] They are usually preserved within the cephalopod's body chamber, commonly in conjunction with the mandibles; but this need not always be the case; [104] many radulae are preserved in a range of settings in the Mason Creek. [105]
The Caribbean reef squid (Sepioteuthis sepioidea), commonly called the reef squid, is a species of small, ... or radula, can be used to further process the food.
The Humboldt squid's diet consists mainly of small fish (lanternfish, in particular), crustaceans, cephalopods, and copepods. [31] The squid uses its barbed tentacle suckers to grab its prey and slices and tears the victim's flesh with its beak and radula. They often approach prey quickly with all 10 appendages extended forward in a cone-like ...
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 ...
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. During mating the male squid uses a specialized arm called a hectocotylus [6] to fertilize the female with his sperm.
The beak of a giant squid. All extant cephalopods have a two-part beak, or rostrum, situated in the buccal mass and surrounded by the muscular head appendages. The dorsal (upper) mandible fits into the ventral (lower) mandible and together they function in a scissor-like fashion. [1] [2] The beak may also be referred to as the mandibles or jaws ...
Gonatopsis is a genus of squid from the family Gonatidae.They are characterised by the loss of their tentacles by the time they have reach the subadult stage. They have arms which have two series of hooks along the midline of the oral surface arms, the radula has five or seven teeth, the mantle can be muscular or flabby, fins are rhomboid or arrow shaped and they lack photophores.