Cuttlefish are marine animals that belong to the class Cephalopoda. These are ancient species that are found in all of the world's oceans, and are thought to have originated about 500 million years ago. Cephalopoda … Many mollusks feed with a radula, to which hundreds of tiny teeth are attached. … The number of fossil species is estimated between 60,000 and 100,000 additional species. The octopus belongs to the phylum, Mollusca. The class is made up of the snails, which have a shell into which the animal can withdraw, and the slugs, which are snails whose shells have … They belong to the class Cephalopoda, which also includes squid, octopuses, and nautiluses. All mollusks reproduce sexually. The intrusion of a foreign object between the mantle and shell surfaces cause certain Bivalvia (Pelecypods) to form pearls . Bivalves, like clams and oysters, are filter feeders and use a siphon to move water into the body. Class Cephalopoda (“head foot” animals), include octopi, squids, cuttlefish, and nautilus. (by Prefixes, Suffixes, Root Words) 1. The class Cephalopoda (“head foot” animals) includes octopuses, squids, cuttlefish, and nautilus. 2 Squids belong to the Class Cephalopoda. The Class Gastropoda includes the groups pertaining to snails and slugs. Cephalopod, any member of the class Cephalopoda of the phylum Mollusca, a small group of highly advanced and organized, exclusively marine animals. 0. 4. The proportion of undescribed species is very high. See more. What class do Mollusk belong to? Look it up now! Finish Editing. The main examples of this kind of mollusks include slugs and snails. To this class belong the Nautili, Squids, Cuttle-fish, etc. Cuttlefish have an internal shell, called the cuttlebone. Cephalopoda is the most morphologically and behaviorally complex class in phylum Mollusca. Question 6 5 out of 5 points The classes Gastropoda, Bivalvia, and Cephalopoda belong to the phylum Mollusca. by enloescience. Despite their name, cuttlefish are not fish but mollusks. This class includes the extinct ammonites and nautiloids. 0% average accuracy. On the right is the relatively common They have large W shaped eyes, eight arms and two tentacles furnished with suckers, with which they secure their prey. The next largest group are the bivalves (class Bivalvia), the chitons (class Amphineura), and octopus and squid, (class Cephalopoda). Share practice link. Pelecypoda (Bivalves) 3. Some mollusks, like tusk shells and bivalves, possess clusters of neurons (called ganglions) rather than true brains, while the brains of more advanced mollusks like cephalopods and gastropods are wrapped around their esophagi rather than isolated in hard skulls. 6th - 12th grade . 5. Gastropoda 2. They are also the most advanced class of the mollusks. Edit. They include some of the most intelligent creatures on the planet. The octopus, squid, cuttlefish, and chambered nautilus are familiar representatives. Many, like octopus and squid have sharp jaws. Despite their name, cuttlefish are not fish but mollusks. These classes are distinguished by, among other criteria, the presence and types of shells they possess. Live Game Live. Class Aplacophora includes worm-like animals with no shell and a rudimentary body structure. 2014-11-23 04:14:46 2014-11-23 04:14:46. Question: To Which Phylum Do Animals In Seashells Belong To? The shell of these creatures is often what is recovered in a fossil dig. 6. It is a cephalopod, the octopus; therefore, Cephalopoda would be its class. Mollusks. Their shells are chambered and may be straight or spiral. Answer. This class contains the cephalopods cephalopod, member of the class Cephalopoda, the most highly organized group of mollusks (phylum Mollusca), and including the squids, octopuses, cuttlefish, and nautiluses. Gills of clams collect food as well as O2 . 0 1 2. Recent studies indicate that cuttlefish are among the most intelligent invertebrates, with one of the largest brain-to-body size ratios of all invertebrates. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn. pod (sĕf′ə-lə-pŏd′) n. Any of various carnivorous marine mollusks of the class Cephalopoda, having a large head, a mouth with a chitinous beak surrounded by arms or tentacles, and in most species, an ink sac containing a dark fluid used for defense, and including the octopuses, squids, cuttlefishes, and nautiluses. Finally, the fourth class of mollusks is the one known as Cephalopoda. Class Cephalopoda The Class Cephalopoda includes mollusks that are active marine predators such as octopus, squid, and chambered nautilus. Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. What Do Each Of These Classes Of Mollusks Means? Cephalopoda means "head foot" and this group has the most complex brain of any invertebrate. 3 The scars in the clam shell are from muscles. Reproduction/Life Cycle. Homework. Wiki User Answered . Mollusks Class Cephalopoda DRAFT. Play. Which of the following mollusks belong to the class Gastropoda. Cuttlefish are marine animals that belong to the class Cephalopoda. Edit. Delete Quiz. Gastropods are by far the largest class of molluscs, comprising over 80% of all molluscs. Top Answer. 12 minutes ago. Despite their name, cuttlefish are not fish but mollusks. Played 0 times. The most common mollusk belongs to the class gastropod. It shares this phylum with its brethren squid and mollusks. Aug 15, 2014 - Cuttlefish are marine animals of the order Sepiida. … They display vivid coloration, typically seen in squids and octopuses, which is used for camouflage. Cephalopods include shelled and reduced-shell groups. Solo Practice. Print; Share; Edit; Delete; Host a game. 0. The Cephalopoda are named such because they have a prominent head that bears long flexible feet. All animals in this class are carnivorous predators and have beak-like jaws at the anterior end. Asked by Wiki User. 1 Clams belong to the Class Bivalvia . The largest number of species of mollusks are in the class Gastropoda, which includes snails with a coiled shell, and others lacking a shell. Their foot is characterized by being long and flat. These highly intelligent mollusks have prominent eyes remarkably similar in structure to those of vertebrates. Cuttlefish have a unique internal shell, the cuttlebone. These mollusks have a distinct head and, usually, at least one pair of tentacles (sometimes two pairs). Save. Cephalopods are mollusks (Cephalopoda), a class which includes octopuses, squid, cuttlefish, and nautilus. Practice. This quiz is incomplete! The Cephalopoda Squids, octopuses, nautilus, and ammonites No. Even more weirdly, most of the neurons of an octopus are located not in its brains, but in its arms, which can function … Learn more about cephalopods in this article. The arms, tentacles, and funnel are all derivatives of the foot. Some have no shell, such as the nautilus, squids, and octopi. Gastropod, any member of more than 65,000 animal species belonging to the class Gastropoda, the largest group in the phylum Mollusca. Apr 17, 2012 - Cuttlefish recognise prey before they have hatched, the first known embryos to show such an ability. Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda.The members are known as molluscs or mollusks (/ ˈ m ɒ l ə s k /).Around 85,000 extant species of molluscs are recognized. Class Cephalopoda (Upper Cambrian to Recent) Cephalopods have a head with eyes. The only cephalopods you are likely to see in the rocky intertidal zone are octopi. The Cephalopoda receive their name from having organs of prehension and locomotion attached to the head, an arrangement toward which a gradual approach may be traced in the highest gasteropod mollusks. Class Cephalopoda. To play this quiz, please finish editing it. Cephalopods are characterized by a completely merged head and foot, with a ring of arms and/or tentacles surrounding the head. Cephalopod definition, any mollusk of the class Cephalopoda, having tentacles attached to the head, including the cuttlefish, squid, and octopus. Mollusks are a Phylum Mollusca. The classes Gastropoda Bivalvia and Cephalopoda belong to the phylum Mollusca from BIOLOGY 101A at City College of San Francisco Recent studies indicate that cuttlefish are among the most intelligent invertebrates, with one of the largest brain-to-body size ratios of all invertebrates. Mollusks definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Cephalopods are a class of shell-bearing animals as well as mollusks with a reduced shell. This quiz is incomplete! They eat small mollusks including other cuttlefish, crabs, shrimp, and fish. They display vivid coloration, typically seen in squids and octopi, which is used for camouflage. “Cephalopoda is a class of mollusks, the highest in organization of the division of the animal kingdom. Mollusks are herbivores, carnivores, filter feeders, detritovores, or parasites. Like squid, octopus, and nautiluses, they belong to the Cephalopoda class. 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