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 The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn.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