On the right is the relatively common All mollusks reproduce sexually. Edit. Answer. Which of the following mollusks belong to the class Gastropoda. The classes Gastropoda Bivalvia and Cephalopoda belong to the phylum Mollusca from BIOLOGY 101A at City College of San Francisco Class Cephalopoda The Class Cephalopoda includes mollusks that are active marine predators such as octopus, squid, and chambered nautilus. See more. Gastropoda 2. (by Prefixes, Suffixes, Root Words) 1. The largest number of species of mollusks are in the class Gastropoda, which includes snails with a coiled shell, and others lacking a shell. Cephalopods are a class of shell-bearing animals as well as mollusks with a reduced shell. Pelecypoda (Bivalves) 3. Cuttlefish are marine animals that belong to the class Cephalopoda. 5. Learn more about cephalopods in this article. 0% average accuracy. The Cephalopoda Squids, octopuses, nautilus, and ammonites No. Play. 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 . Cephalopoda … Class Cephalopoda (“head foot” animals), include octopi, squids, cuttlefish, and nautilus. Wiki User Answered . The class Cephalopoda (“head foot” animals) includes octopuses, squids, cuttlefish, and nautilus. “Cephalopoda is a class of mollusks, the highest in organization of the division of the animal kingdom. Cephalopods include shelled and reduced-shell groups. The octopus, squid, cuttlefish, and chambered nautilus are familiar representatives. 3 The scars in the clam shell are from muscles. 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. Despite their name, cuttlefish are not fish but mollusks. This quiz is incomplete! The shell of these creatures is often what is recovered in a fossil dig. Mollusks are a Phylum Mollusca. Cephalopod definition, any mollusk of the class Cephalopoda, having tentacles attached to the head, including the cuttlefish, squid, and octopus. The next largest group are the bivalves (class Bivalvia), the chitons (class Amphineura), and octopus and squid, (class Cephalopoda). Some have no shell, such as the nautilus, squids, and octopi. They display vivid coloration, typically seen in squids and octopi, which is used for camouflage. Even more weirdly, most of the neurons of an octopus are located not in its brains, but in its arms, which can function … Delete Quiz. Question 6 5 out of 5 points The classes Gastropoda, Bivalvia, and Cephalopoda belong to the phylum Mollusca. The Class Gastropoda includes the groups pertaining to snails and slugs. They belong to the class Cephalopoda, which also includes squid, octopuses, and nautiluses. Mollusks. Gastropod, any member of more than 65,000 animal species belonging to the class Gastropoda, the largest group in the phylum Mollusca. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn. Finish Editing. … Aug 15, 2014 - Cuttlefish are marine animals of the order Sepiida. To play this quiz, please finish editing it. Despite their name, cuttlefish are not fish but mollusks. Gills of clams collect food as well as O2 . Print; Share; Edit; Delete; Host a game. To this class belong the Nautili, Squids, Cuttle-fish, etc. The arms, tentacles, and funnel are all derivatives of the foot. The number of fossil species is estimated between 60,000 and 100,000 additional species. Answer Selected Answer: a. Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. The Cephalopoda are named such because they have a prominent head that bears long flexible feet. The proportion of undescribed species is very high. Class Cephalopoda. Live Game Live. Cephalopods are mollusks (Cephalopoda), a class which includes octopuses, squid, cuttlefish, and nautilus. Top Answer. Bivalves, like clams and oysters, are filter feeders and use a siphon to move water into the body. Apr 17, 2012 - Cuttlefish recognise prey before they have hatched, the first known embryos to show such an ability. 6th - 12th grade . Their shells are chambered and may be straight or spiral. 0 1 2. Cuttlefish are marine animals that belong to the class Cephalopoda. 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. 4. They are also the most advanced class of the mollusks. 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. by enloescience. Gastropods are by far the largest class of molluscs, comprising over 80% of all molluscs. Cephalopod, any member of the class Cephalopoda of the phylum Mollusca, a small group of highly advanced and organized, exclusively marine animals. These highly intelligent mollusks have prominent eyes remarkably similar in structure to those of vertebrates. Homework. Class Aplacophora includes worm-like animals with no shell and a rudimentary body structure. Cephalopoda means "head foot" and this group has the most complex brain of any invertebrate. Cephalopods are characterized by a completely merged head and foot, with a ring of arms and/or tentacles surrounding the head. What class do Mollusk belong to? Practice. 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. Finally, the fourth class of mollusks is the one known as Cephalopoda. The most common mollusk belongs to the class gastropod. Mollusks definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Mollusks Class Cephalopoda DRAFT. Their foot is characterized by being long and flat. The main examples of this kind of mollusks include slugs and snails. Despite their name, cuttlefish are not fish but mollusks. These mollusks have a distinct head and, usually, at least one pair of tentacles (sometimes two pairs). Cephalopoda is the most morphologically and behaviorally complex class in phylum Mollusca. 0. They display vivid coloration, typically seen in squids and octopuses, which is used for camouflage. 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