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