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