This quiz is incomplete! Their shells are chambered and may be straight or spiral. Despite their name, cuttlefish are not fish but mollusks. Answer. This class includes the extinct ammonites and nautiloids. 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 display vivid coloration, typically seen in squids and octopi, which is used for camouflage. The Cephalopoda are named such because they have a prominent head that bears long flexible feet. 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 octopus, squid, cuttlefish, and chambered nautilus are familiar representatives. To this class belong the Nautili, Squids, Cuttle-fish, etc. … Question 6 5 out of 5 points The classes Gastropoda, Bivalvia, and Cephalopoda belong to the phylum Mollusca. The intrusion of a foreign object between the mantle and shell surfaces cause certain Bivalvia (Pelecypods) to form pearls . Cuttlefish are marine animals that belong to the class Cephalopoda. Pelecypoda (Bivalves) 3. Class Cephalopoda The Class Cephalopoda includes mollusks that are active marine predators such as octopus, squid, and chambered nautilus. 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. Cephalopods are characterized by a completely merged head and foot, with a ring of arms and/or tentacles surrounding the head. 5. Recent studies indicate that cuttlefish are among the most intelligent invertebrates, with one of the largest brain-to-body size ratios of all invertebrates. Cuttlefish have a unique internal shell, the cuttlebone. Cephalopoda … The arms, tentacles, and funnel are all derivatives of the foot. Gills of clams collect food as well as O2 . Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. All animals in this class are carnivorous predators and have beak-like jaws at the anterior end. They eat small mollusks including other cuttlefish, crabs, shrimp, and fish. 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. What class do Mollusk belong to? Even more weirdly, most of the neurons of an octopus are located not in its brains, but in its arms, which can function … 6. 0. The classes Gastropoda Bivalvia and Cephalopoda belong to the phylum Mollusca from BIOLOGY 101A at City College of San Francisco 6th - 12th grade . 2014-11-23 04:14:46 2014-11-23 04:14:46. Many mollusks feed with a radula, to which hundreds of tiny teeth are attached. Played 0 times. They include some of the most intelligent creatures on the planet. Class Cephalopoda. All mollusks reproduce sexually. Question: To Which Phylum Do Animals In Seashells Belong To? Like squid, octopus, and nautiluses, they belong to the Cephalopoda class. Wiki User Answered . Aug 15, 2014 - Cuttlefish are marine animals of the order Sepiida. Answer Selected Answer: a. Solo Practice. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn. See more. These mollusks have a distinct head and, usually, at least one pair of tentacles (sometimes two pairs). Gastropods are by far the largest class of molluscs, comprising over 80% of all molluscs. … The main examples of this kind of mollusks include slugs and snails. Look it up now! The octopus belongs to the phylum, Mollusca. They belong to the class Cephalopoda, which also includes squid, octopuses, and nautiluses. The Cephalopoda Squids, octopuses, nautilus, and ammonites No. 0 1 2. Reproduction/Life Cycle. Edit. They display vivid coloration, typically seen in squids and octopuses, which is used for camouflage. Cephalopods include shelled and reduced-shell groups. Print; Share; Edit; Delete; Host a game. Cephalopoda means "head foot" and this group has the most complex brain of any invertebrate. To play this quiz, please finish editing it. Gastropoda 2. Top Answer. The shell of these creatures is often what is recovered in a fossil dig. Class Cephalopoda (“head foot” animals), include octopi, squids, cuttlefish, and nautilus. Despite their name, cuttlefish are not fish but mollusks. These classes are distinguished by, among other criteria, the presence and types of shells they possess. Share practice link. The largest number of species of mollusks are in the class Gastropoda, which includes snails with a coiled shell, and others lacking a shell. 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. “Cephalopoda is a class of mollusks, the highest in organization of the division of the animal kingdom. Delete Quiz. Cephalopods are mollusks (Cephalopoda), a class which includes octopuses, squid, cuttlefish, and nautilus. Cephalopod definition, any mollusk of the class Cephalopoda, having tentacles attached to the head, including the cuttlefish, squid, and octopus. The class Cephalopoda (“head foot” animals) includes octopuses, squids, cuttlefish, and nautilus. 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