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