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