difference between gastropods, bivalves, and cephalopods
Aquatic gastropods have gills located in the mantle cavity. gastropod: Class of mollusks that use their foot to crawl, i.e. What is the difference between a gastropod and a bivalve? Octopuses do not have shells at all, while squids have a small internal shell. These cookies will be stored in your browser only with your consent. Bivalves include clams, oysters, and mussels. The most obvious difference between most cephalopods and other mollusks is the apparent lack of a shell. Some having up to 100 tentacles. What is the difference between a gastropod and a bivalve? Although most gastropods are conispirally coiled and lack bilateral symmetry, some forms, such as Bellerophon, are planispirally coiled and have bilateral symmetry. 28.3F: Classification of Phylum Mollusca - Biology LibreTexts Unclassified cookies are cookies that we are in the process of classifying, together with the providers of individual cookies. Who are the Gastropoda the Bivalvia and the Cephalopoda? 2023 WILD SKY MEDIA. Gastropods, like slugs and snails, can live on land or in the water. Bivalves are the dominant group in the alatoconchid zone, but are uncommon in the gastropod-rich lime-stones. The website cannot function properly without these cookies. These classes are distinguished by, among other criteria, the presence and types of shells they possess. bivalve: Class of mollusks that use their foot to attach themselves to rocks or to burrow into mud, i.e. Phylum Mollusca includes a group of soft-bodied invertebrates with bilateral symmetry. Early in their evolution, cephalopods relied on the sturdy protection of shells, but over time many eventually lost the outer shell and instead relied on . All files associated with this page are copyrighted 1997
The Wonders of the Seas: Mollusks - Oceanic Research Animals in class Gastropoda (stomach foot) include well-known mollusks like snails, slugs, conchs, sea hares, and sea butterflies. The key difference between cephalopods and gastropods is that cephalopods are exclusively marine animals, while the majority of . PDF Functional Morphology of Gastropods and Bivalves Creatures in this class have a muscular foot they use for locomotion on the underside of their visceral mass. Their basic anatomy consists of a head -- or mantle -- that contains all their internal organs, and feet -- often referred to as arms or tentacles -- which help them with hunting and propulsion. Terrestrial gastropods like snails and slugs eat plants, fungi, and algae, while the vast majority of marine mollusks (including bivalves and other ocean-dwelling species) subsist on plant matter dissolved in the water, which they ingest by filter feeding. Learn more. bivalve: Class of mollusks that use their foot to attach themselves to rocks or to burrow into mud, i.e. Phylum - Mollusca (Gastropods, Bivalves, Cephalopods) There are more than 50,000 species in this phylum. Cephalopods have the most complicated nervous system found in invertebrates. Gastropod Shapes and Description, Kentucky Geological Survey You also have the option to opt-out of these cookies. What is difference between Gastropoda and Bivalvia? They have a rough, tongue-like structure, called a radula, with which they scrape away at food. snails. They are also the only cephalopods with four gills instead of two.) In contrast, Nautilus, the modern cephalopod with a coiled shell, is coiled in the same plane, which is termedplanispiral coiling. Coloring PageLabeling PageDownload Hi-Res B&W DiagramDownload Hi-Res Color Diagram. February 27, 2023 . They then stuff prey into a central mouth. Which describes a difference between bivalves and cephalopods? Univalvenoun. Reading: Mollusks | Biology II Laboratory Manual Scallops are different. Unlike the tiny gastropod and bivalve types of mollusca, cephalopods like the giant squid can grow to lengths of 59 feet (18 meters). We also use third-party cookies that help us analyze and understand how you use this website. 4 What are the principal differences between gastropods and cephalopods that can be used to distinguish these two classes of Mollusca? They do this by siphoning water over the gills which traps it and propels it toward the mouth. Mollusk Classification - Advanced. They also have very well developed eyesight that is used in finding prey. 1 What do gastropods bivalves and cephalopods have in common? When you research information you must cite the reference. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Cephalopods have a more developed nervous system than other mollusks. Cephalopods have a relatively complex brain and eyes with good, color vision. To help students learn the animals of the Mollusk Phylum, print out this black and white diagram of them. They use their shell to open and close rapidly. ), Cephalopods. In cephalopods, there is a single siphon or funnel which is known as a hyponome . In the more aquatic gastropods, there are gills instead. Ctenidia are absent in these animals. Among the most obvious differences between gastropods and cephalopods are the habitats in which they live. The law states that we can store cookies on your device if they are strictly necessary for the operation of this site. These cookies ensure basic functionalities and security features of the website, anonymously. March 4, 2023< http://www.exploringnature.org/db/view/Mollusca-Gastropods-Bivalves-Cephalopods >. Molluscs possess a soft body, which is divided in visceral mass and foot. Gastropods, on the other hand, can live in a range of different environments. gastropod: Class of mollusks that use their foot to crawl, i.e. . similarities between cephalopods and bivalves bivalve: Class of mollusks that use their foot to attach themselves to rocks or to burrow into mud, i.e. O Bivalves have an open circulatory system, and cephalopods have a closed . Cephalopods have much more specific diets than gastropods. Habitat: They are found in both salt (marine) and freshwater habitats and on land. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. A roughfile clam from the Flower Garden Bank National Marine Sanctuaryjust one of many different bivalve mollusk species. The most common cephalopods are cuttle fish and squids. The key difference between cephalopods and gastropods is that cephalopods are exclusively marine animals, while the majority of gastropods are terrestrial, and some are from marine and freshwater. The Bivalves The bivalves (class Bivalvia) are very well known. The nervous system of mollusks varies greatly depending on the particular class, but it is generally more complex than those of roundworms or flatworms. Cephalopods live only in ocean environments, and gastropods live in a variety of environments. All cephalopods are predators. No cephalopods -- with the exception of species belonging to the taxonomic subclass Nautiloidea -- have external shells. Class Cephalopoda The Cephalopods (Class Cephalopoda) include squid, octopuses and nautilus. Cephalopods: Cephalopod means shellfish that have legs over their heads. A List of Mollusks | Sciencing BivalvesClams and relatives (Class: Bivalvia) Bivalves have two shells (valves) held closed by powerful muscles. Whorls (coils) of nautiloid cephalopods are the same when viewed from either side of the aperture, while the number and appearance of whorls of gastropods are different on either side. University of Kentucky. The largest group of the mollusks are called the gastropods includes snails, conchs, abalones, whelks, sea slugs, and garden slugs. The octopus has neither. var d = new Date();
They have what is referred to as the visceral mass, mantle and foot. See answer (1) Best Answer. Univalves are animals with one shell such as a snail. Diet: Unlike many mollusks that feed using a rasping tongue, called a radula, bivalves feed by filtering food particles from the water. What are the characteristics of cephalopods? gastropod: Class of mollusks that use their foot to crawl, i.e. Bivalves got their name because they have two hinged shells that protect their soft bodies. Cephalopods are found only in marine water. The cookie is used to store the user consent for the cookies in the category "Analytics". Visceral mass remains covered by special skin called mantle, which is capable of secreting a shell. What do gastropods bivalves and cephalopods have in common? They can be detritivores, who eat detritus; grazers, who feed on grass; scavengers, who search for both plant and animal matter; browsers, who feed on leaves, barks and stems; or carnivores. Their name Cephalopoda means head footed. They are all fast moving ocean animals. Bivalves (virtually all seashells) and gastropods (snails) became dominant aspects of the seas in the Mesozoic.During the Paleozoic, they played a subordinate role to the Paleozoic fauna of brachiopods, bryozoans, crinoids, tabulate corals, and rugose corals. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The cookie is used to store the user consent for the cookies in the category "Other. clams. They are thought to be intelligent and can learn from experience. For all other types of cookies we need your permission. But opting out of some of these cookies may affect your browsing experience. What are two major differences between gastropods and cephalopods? Bivalves have been much more thoroughly This cookie is set by GDPR Cookie Consent plugin. What is the difference between Gastropoda and Bivalvia? The classes that have shells are the Gastropods, Bivalves, and Cephalopods. Basic External Anatomy Labeling of the Snail (for younger students). Lithographic Plates from Kentucky Fossil Shells--A Monograph of the Fossil Shells of the Silurian and Devonian [and Ordovician] Rocks of Kentucky. slugs). How many times should a shock absorber bounce? Mollusks - MBGnet See all questions in Animal Classification. Phylum Mollusca includes a group of soft-bodied invertebrates with bilateral symmetry. Calcareous spines may be present on the girdle to offer protection from predators. Terrestrial gastropods respire through lungs, and the aquatic ones respire through gills. cephalopod: Class of mollusks characterized by a set of arms or tentacles; i.e. Cephalopods are the largest group of mollusks, and gastropods are the . Members of class Monoplacophora have a single shell that encloses the body. The mantle of terrestrial gastropods functions as a lung. Explanation: Class: Gastropod Symmetry: The gastropods are asymmetrical because of an embryonic event, which is called torsion: this could be followed by coiling; visceral mass is covered by a single piece, usually coiled, shell. They are closely related to the snail family but the only difference is that they do not have external shells like the snails; instead they have internal shells that are made from a spongy material. A arthropod's body has a . The majority of gastropods are terrestrial, meaning they live on land, but can also be found in the ocean and in freshwater lakes or streams. they feed on fish, crustaceans, worms, and other mollusks. Mollusks are invertebrates and include octopus, squid, snails, slugs, clams, and oysters and many others. It's mollusk mania! A siphon is a long tube-like structure that is present in certain aquatic molluscs: Gastropods, bivalves, and cephalopods.The tube is used for the exchange of liquids, or air.This flow can have different purposes, the most common are breathing, locomotion, feeding and reproduction.. Molluscs have a shell. That is why snails are helpful to have in an aquarium. What are the differences between the main characteristics of bivalves, gastropods, and cephalopods? gastropods include species like snails and slugs. Cephalopods are the only mollusks that have closed circulatory system,. Bivalves also live across a larger range of habitats, including both marine and freshwater ecosystems, while brachiopods are restricted only to marine environments. The mollusks that have a hinged, two-part shell joined by strong muscles are called bivalves. The cookie is used to store the user consent for the cookies in the category "Performance". Mollusks that exist today are divided into seven different classes, and these are listed in the Mollusk Classes Table.Classification of Mollusks. They have what is referred to as the visceral mass, mantle and foot. They're more easily characterized by their differences than their similarities. What are the answers to studies weekly week 26 social studies? Cephalopods are a class of shell-bearing animals as well as mollusks with a reduced shell. Analytical cookies are used to understand how visitors interact with the website. snails. 2 What is the major difference between classes Gastropoda and Bivalvia? How A Siphon Works. ________________________________________________________________________________________________________________________________. The Mollusk visceral mass includes body organs the digestive tract, renal and reproductive organs. . Gastropods and Bivalve belong to the same phylum, Mollusc, but different classes due to very striking differences. The shells can open and close when needed, but are usually held closed by powerful muscles to protect them from predators. As their name implies, they have two parts of their shell, which can open and close. By clicking Accept All, you consent to the use of ALL the cookies. Most are aquatic, b. They also have two pairs of tentacles, only one bearing eyes at the end. Analytics cookies help website owners to understand how visitors interact with websites by collecting and reporting information anonymously. They use their foot for burrowing. (Nautiluses, which are found in the South . While on the other hand Mussels and Oysters attach themselves with a strong thread or cement to solid surfaces. Gastropods are one piece and usually have a spiral on the end. The cookie is used to store the user consent for the cookies in the category "Performance". Cephalopods are strictly marine creatures -- they can only be found in the ocean. Answer (1 of 2): Gastropod means stomach foot (gastro= stomach; pod = foot) . Gametes are released into the mantle cavity. They display vivid coloration, typically seen in squids and octopuses which is used for camouflage. Necessary cookies are absolutely essential for the website to function properly. How are cephalopods different from bivalves? How are bivalves different from other mollusks? Bivalve shells are made of two pieces connected at a hinge. Comparing Bivalves and Gastropods Bivalve shells are made of two pieces connected at a hinge. . 2 What are 2 differences between cephalopods and other mollusks? This cookie is set by GDPR Cookie Consent plugin. They have nervous, and digestive systems, a head, eye stalks and a mouth, Most all live in shells that are coiled, some have no shells. These animals are well adapted for living in water. univalve. What is the difference between torsion and shell coiling in gastropods? . Empower Her. Phylum - Mollusca (Gastropods, Bivalves, Cephalopods) - Exploring Nature around the world. Clams, mussels, oysters and scallops are all bivalves. Why Are Sagittarius So Attracted To Capricorns,
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Aquatic gastropods have gills located in the mantle cavity. gastropod: Class of mollusks that use their foot to crawl, i.e. What is the difference between a gastropod and a bivalve? Octopuses do not have shells at all, while squids have a small internal shell. These cookies will be stored in your browser only with your consent. Bivalves include clams, oysters, and mussels. The most obvious difference between most cephalopods and other mollusks is the apparent lack of a shell. Some having up to 100 tentacles. What is the difference between a gastropod and a bivalve? Although most gastropods are conispirally coiled and lack bilateral symmetry, some forms, such as Bellerophon, are planispirally coiled and have bilateral symmetry. 28.3F: Classification of Phylum Mollusca - Biology LibreTexts Unclassified cookies are cookies that we are in the process of classifying, together with the providers of individual cookies. Who are the Gastropoda the Bivalvia and the Cephalopoda? 2023 WILD SKY MEDIA. Gastropods, like slugs and snails, can live on land or in the water. Bivalves are the dominant group in the alatoconchid zone, but are uncommon in the gastropod-rich lime-stones. The website cannot function properly without these cookies. These classes are distinguished by, among other criteria, the presence and types of shells they possess. bivalve: Class of mollusks that use their foot to attach themselves to rocks or to burrow into mud, i.e. Phylum Mollusca includes a group of soft-bodied invertebrates with bilateral symmetry. Early in their evolution, cephalopods relied on the sturdy protection of shells, but over time many eventually lost the outer shell and instead relied on . All files associated with this page are copyrighted 1997 The Wonders of the Seas: Mollusks - Oceanic Research Animals in class Gastropoda (stomach foot) include well-known mollusks like snails, slugs, conchs, sea hares, and sea butterflies. The key difference between cephalopods and gastropods is that cephalopods are exclusively marine animals, while the majority of . PDF Functional Morphology of Gastropods and Bivalves Creatures in this class have a muscular foot they use for locomotion on the underside of their visceral mass. Their basic anatomy consists of a head -- or mantle -- that contains all their internal organs, and feet -- often referred to as arms or tentacles -- which help them with hunting and propulsion. Terrestrial gastropods like snails and slugs eat plants, fungi, and algae, while the vast majority of marine mollusks (including bivalves and other ocean-dwelling species) subsist on plant matter dissolved in the water, which they ingest by filter feeding. Learn more. bivalve: Class of mollusks that use their foot to attach themselves to rocks or to burrow into mud, i.e. Phylum - Mollusca (Gastropods, Bivalves, Cephalopods) There are more than 50,000 species in this phylum. Cephalopods have the most complicated nervous system found in invertebrates. Gastropod Shapes and Description, Kentucky Geological Survey You also have the option to opt-out of these cookies. What is difference between Gastropoda and Bivalvia? They have a rough, tongue-like structure, called a radula, with which they scrape away at food. snails. They are also the only cephalopods with four gills instead of two.) In contrast, Nautilus, the modern cephalopod with a coiled shell, is coiled in the same plane, which is termedplanispiral coiling. Coloring PageLabeling PageDownload Hi-Res B&W DiagramDownload Hi-Res Color Diagram. February 27, 2023 . They then stuff prey into a central mouth. Which describes a difference between bivalves and cephalopods? Univalvenoun. Reading: Mollusks | Biology II Laboratory Manual Scallops are different. Unlike the tiny gastropod and bivalve types of mollusca, cephalopods like the giant squid can grow to lengths of 59 feet (18 meters). We also use third-party cookies that help us analyze and understand how you use this website. 4 What are the principal differences between gastropods and cephalopods that can be used to distinguish these two classes of Mollusca? They do this by siphoning water over the gills which traps it and propels it toward the mouth. Mollusk Classification - Advanced. They also have very well developed eyesight that is used in finding prey. 1 What do gastropods bivalves and cephalopods have in common? When you research information you must cite the reference. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Cephalopods have a more developed nervous system than other mollusks. Cephalopods have a relatively complex brain and eyes with good, color vision. To help students learn the animals of the Mollusk Phylum, print out this black and white diagram of them. They use their shell to open and close rapidly. ), Cephalopods. In cephalopods, there is a single siphon or funnel which is known as a hyponome . In the more aquatic gastropods, there are gills instead. Ctenidia are absent in these animals. Among the most obvious differences between gastropods and cephalopods are the habitats in which they live. The law states that we can store cookies on your device if they are strictly necessary for the operation of this site. These cookies ensure basic functionalities and security features of the website, anonymously. March 4, 2023< http://www.exploringnature.org/db/view/Mollusca-Gastropods-Bivalves-Cephalopods >. Molluscs possess a soft body, which is divided in visceral mass and foot. Gastropods, on the other hand, can live in a range of different environments. gastropod: Class of mollusks that use their foot to crawl, i.e. . similarities between cephalopods and bivalves bivalve: Class of mollusks that use their foot to attach themselves to rocks or to burrow into mud, i.e. O Bivalves have an open circulatory system, and cephalopods have a closed . Cephalopods have much more specific diets than gastropods. Habitat: They are found in both salt (marine) and freshwater habitats and on land. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. A roughfile clam from the Flower Garden Bank National Marine Sanctuaryjust one of many different bivalve mollusk species. The most common cephalopods are cuttle fish and squids. The key difference between cephalopods and gastropods is that cephalopods are exclusively marine animals, while the majority of gastropods are terrestrial, and some are from marine and freshwater. The Bivalves The bivalves (class Bivalvia) are very well known. The nervous system of mollusks varies greatly depending on the particular class, but it is generally more complex than those of roundworms or flatworms. Cephalopods live only in ocean environments, and gastropods live in a variety of environments. All cephalopods are predators. No cephalopods -- with the exception of species belonging to the taxonomic subclass Nautiloidea -- have external shells. Class Cephalopoda The Cephalopods (Class Cephalopoda) include squid, octopuses and nautilus. Cephalopods: Cephalopod means shellfish that have legs over their heads. A List of Mollusks | Sciencing BivalvesClams and relatives (Class: Bivalvia) Bivalves have two shells (valves) held closed by powerful muscles. Whorls (coils) of nautiloid cephalopods are the same when viewed from either side of the aperture, while the number and appearance of whorls of gastropods are different on either side. University of Kentucky. The largest group of the mollusks are called the gastropods includes snails, conchs, abalones, whelks, sea slugs, and garden slugs. The octopus has neither. var d = new Date(); They have what is referred to as the visceral mass, mantle and foot. See answer (1) Best Answer. Univalves are animals with one shell such as a snail. Diet: Unlike many mollusks that feed using a rasping tongue, called a radula, bivalves feed by filtering food particles from the water. What are the characteristics of cephalopods? gastropod: Class of mollusks that use their foot to crawl, i.e. Bivalves got their name because they have two hinged shells that protect their soft bodies. Cephalopods are found only in marine water. The cookie is used to store the user consent for the cookies in the category "Analytics". Visceral mass remains covered by special skin called mantle, which is capable of secreting a shell. What do gastropods bivalves and cephalopods have in common? They can be detritivores, who eat detritus; grazers, who feed on grass; scavengers, who search for both plant and animal matter; browsers, who feed on leaves, barks and stems; or carnivores. Their name Cephalopoda means head footed. They are all fast moving ocean animals. Bivalves (virtually all seashells) and gastropods (snails) became dominant aspects of the seas in the Mesozoic.During the Paleozoic, they played a subordinate role to the Paleozoic fauna of brachiopods, bryozoans, crinoids, tabulate corals, and rugose corals. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The cookie is used to store the user consent for the cookies in the category "Other. clams. They are thought to be intelligent and can learn from experience. For all other types of cookies we need your permission. But opting out of some of these cookies may affect your browsing experience. What are two major differences between gastropods and cephalopods? Bivalves have been much more thoroughly This cookie is set by GDPR Cookie Consent plugin. What is the difference between Gastropoda and Bivalvia? The classes that have shells are the Gastropods, Bivalves, and Cephalopods. Basic External Anatomy Labeling of the Snail (for younger students). Lithographic Plates from Kentucky Fossil Shells--A Monograph of the Fossil Shells of the Silurian and Devonian [and Ordovician] Rocks of Kentucky. slugs). How many times should a shock absorber bounce? Mollusks - MBGnet See all questions in Animal Classification. Phylum Mollusca includes a group of soft-bodied invertebrates with bilateral symmetry. Calcareous spines may be present on the girdle to offer protection from predators. Terrestrial gastropods respire through lungs, and the aquatic ones respire through gills. cephalopod: Class of mollusks characterized by a set of arms or tentacles; i.e. Cephalopods are the largest group of mollusks, and gastropods are the . Members of class Monoplacophora have a single shell that encloses the body. The mantle of terrestrial gastropods functions as a lung. Explanation: Class: Gastropod Symmetry: The gastropods are asymmetrical because of an embryonic event, which is called torsion: this could be followed by coiling; visceral mass is covered by a single piece, usually coiled, shell. They are closely related to the snail family but the only difference is that they do not have external shells like the snails; instead they have internal shells that are made from a spongy material. A arthropod's body has a . The majority of gastropods are terrestrial, meaning they live on land, but can also be found in the ocean and in freshwater lakes or streams. they feed on fish, crustaceans, worms, and other mollusks. Mollusks are invertebrates and include octopus, squid, snails, slugs, clams, and oysters and many others. It's mollusk mania! A siphon is a long tube-like structure that is present in certain aquatic molluscs: Gastropods, bivalves, and cephalopods.The tube is used for the exchange of liquids, or air.This flow can have different purposes, the most common are breathing, locomotion, feeding and reproduction.. Molluscs have a shell. That is why snails are helpful to have in an aquarium. What are the differences between the main characteristics of bivalves, gastropods, and cephalopods? gastropods include species like snails and slugs. Cephalopods are the only mollusks that have closed circulatory system,. Bivalves also live across a larger range of habitats, including both marine and freshwater ecosystems, while brachiopods are restricted only to marine environments. The mollusks that have a hinged, two-part shell joined by strong muscles are called bivalves. The cookie is used to store the user consent for the cookies in the category "Performance". Mollusks that exist today are divided into seven different classes, and these are listed in the Mollusk Classes Table.Classification of Mollusks. They have what is referred to as the visceral mass, mantle and foot. They're more easily characterized by their differences than their similarities. What are the answers to studies weekly week 26 social studies? Cephalopods are a class of shell-bearing animals as well as mollusks with a reduced shell. Analytical cookies are used to understand how visitors interact with the website. snails. 2 What is the major difference between classes Gastropoda and Bivalvia? How A Siphon Works. ________________________________________________________________________________________________________________________________. The Mollusk visceral mass includes body organs the digestive tract, renal and reproductive organs. . Gastropods and Bivalve belong to the same phylum, Mollusc, but different classes due to very striking differences. The shells can open and close when needed, but are usually held closed by powerful muscles to protect them from predators. As their name implies, they have two parts of their shell, which can open and close. By clicking Accept All, you consent to the use of ALL the cookies. Most are aquatic, b. They also have two pairs of tentacles, only one bearing eyes at the end. Analytics cookies help website owners to understand how visitors interact with websites by collecting and reporting information anonymously. They use their foot for burrowing. (Nautiluses, which are found in the South . While on the other hand Mussels and Oysters attach themselves with a strong thread or cement to solid surfaces. Gastropods are one piece and usually have a spiral on the end. The cookie is used to store the user consent for the cookies in the category "Performance". Cephalopods are strictly marine creatures -- they can only be found in the ocean. Answer (1 of 2): Gastropod means stomach foot (gastro= stomach; pod = foot) . Gametes are released into the mantle cavity. They display vivid coloration, typically seen in squids and octopuses which is used for camouflage. Necessary cookies are absolutely essential for the website to function properly. How are cephalopods different from bivalves? How are bivalves different from other mollusks? Bivalve shells are made of two pieces connected at a hinge. Comparing Bivalves and Gastropods Bivalve shells are made of two pieces connected at a hinge. . 2 What are 2 differences between cephalopods and other mollusks? This cookie is set by GDPR Cookie Consent plugin. They have nervous, and digestive systems, a head, eye stalks and a mouth, Most all live in shells that are coiled, some have no shells. These animals are well adapted for living in water. univalve. What is the difference between torsion and shell coiling in gastropods? . Empower Her. Phylum - Mollusca (Gastropods, Bivalves, Cephalopods) - Exploring Nature around the world. Clams, mussels, oysters and scallops are all bivalves.
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