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