phylum mollusca characteristics

Body possesses a through gut with mouth and anus. This class contains about 800 known living species including octopus, squid, and cuttlefish which only inhabit in marine environments. Excretion by a pair of kidneys or organs of Bojanus and pericardial gland or Keber’s organ. amzn_assoc_region = "US"; https://www.toppr.com/guides/biology/animal-kingdom/phylum-mollusca squid) are active predators. amzn_assoc_marketplace = "amazon"; Besides these, many scientists use bivalve mollusks as bioindicators of the freshwater and marine environments. The phylum Mollusca is composed of a variety of organisms. The mouth contains a rasping structure ‘radula’ with chitinous teeth for scraping or cutting food. Head bears eyes and a pair of tentacles. But some species live in freshwater and terrestrial habitats.They play an important role in the lives of humans because they are the source of food for many people. They have a well-developed and complex digestive system. amzn_assoc_linkid = "8176995fc60e05367dcce2a1fda714d5"; They have multiple pairs of excretory organs (nephridia) which are arranged serially. What is an identifying characteristic of cephalopods? Larva is trochopore or veliger or parasitic stage called glochidium larva. Habitat: They are mostly marine. Body is divisible into head (absence in pelecypoda and scaphopoda), dorsal visceral mass, ventral muscular foot and mantle. Mix Play all Mix - Magnet ... Phylum Characteristics … They exhibit organ system level of organization. The pallial cavity bears many pairs of small-sized gills which surround the foot. amzn_assoc_asins = "B00DQZ64YC,B004WYX4AS,B000A38F3Q,B000A2KAXU,B002C014JW,B0000ANHSZ,B002R0F9LG,B0012M2O90,B007HJFVNI"; Body is unsegmented (except Neoplina) and bilaterally symmetrical (except few twisting forms like Pila). Among them, many species are cosmopolitan in distribution. Besides these, some live in terrestrial damp soil. Respiration takes place through one or more gills or ctenidia, lungs (pulmonary sac) or general body surface in the terrestrial forms. Class Bivalviaconsists of molluscs that have two connected shells such as Oysters, Clams, Mussels, Scallops and many more. Select one: a. Nematoda. They are mostly found in marine and fresh water. The tentacles have a bulbous end which is known as captaculae. They are commonly called soft bodied animals. Examples: Turritella cumberlandia, Diastoma insulaemaris, Epitonium charlestonensis, Pila globosa (Apple snail). amzn_assoc_ad_type = "smart"; They are triploblastic animals with un-segmented (exception: Mantle and shell cover the body and the body has three regions namely: head, ventral foot, and a visceral mass. They are mostly aquatic organisms. Circulatory system is closed or open type. But all Molluscs have the same basic structure. The single dorsal shell is thin and sub […] 2 Molluscs are present in most Nearctic freshwater habitats other than hypersaline lakes, which are colonized by only a few snail species (Assiminea spp. Locomotion takes place by ventral muscular foot. They may be found as hidden parasites in the interior of other animals. Octopus is known as devil fish. Start studying Phylum Mollusca. Phylum Mollusca (Mollusks) Characteristics They are essentially aquatic mostly marine, few freshwater and some terrestrial form. Generally, the hard calciferous shells of mollusks are used to build awesome jewellery pieces. Most of them inhabit in the marine environment and few are freshwater. Mollusks have a dramatic variety of form, ranging from large predatory squids and octopus, some of which show a high degree of intelligence, to grazing forms with elaborately sculpted and colored shells. Many molluscans are not good for human’s lives. Coelom reduced Most viscera concentrated in dorsal visceral mass Body covered by thick mantle (epidermis) which forms a cavity Mantle secretes calcium carbonate shell (or spicules) Large ventral muscular foot Radula (band of teeth in esophagus) Additional classes not covered in lab: … The class Gastropoda contains more than 65,000 species which make the largest group in the phylum Mollusca comprising over 80% of all mollusks. Fig. Osphradia- chemoreceptor to test chemical nature of the water. Tags: Examples of Mollusca, General characters of Mollusca, Mollusca, Molluscans, Neopilina as connecting link, Osphradium, Statocyst. Aschelminthes are pseudocoelomate, bilaterally symmetrical, triploblastic, unsegmented, vermiform, organ- system grade of construction with complete digestive tubes. They have a looped digestive system where the stomach is cone-shaped with long intestine that makes four to six loops before reaching the posteriorly-positioned anus. Body is soft and unsegmented (except Neopilina). Class # 1. Mantle secrets tiny calcareous spicules which make their body a beautiful shine. They are carnivorous and their foods consist of various fish, crustaceans and other mollusks. Body without cavity. Their foot is modified into eight arms or two tentacles in the head region. They show direct or indirect development with trochophore or veliger larval stages. The nervous system is simple that contains two pairs of lateral nerve cords with several special tiny sensory organs. A cuttlefish, a coleoid cephalopod, moves primarily by undulating its body fins. amzn_assoc_placement = "adunit0"; INTRODUCTION TO THE MOLLUSCA. They include slow-moving snails and slugs bivalved (shell with two parts) clams and highly active cephalopods. Phylum Mollusca (Mollusks) Etymology: From the Latin Molluscus, meaning soft of body. Linnaeus (1758) coined the name of this phylum. Very few are terrestrial found in damp soil. Development may be direct or indirect. phylum of organisms characterized by having a soft body, muscular foot, and (most often) a protective shell; 1)Bilaterally symmetrical. They have both ends open single conical shell. Mollusca makes the second largest phylum of non-chordate animals including snails, octopuses, sea slugs, squid, and bivalves such as clams, oysters, and mussels. They are exclusively deep water marine mollusks and are found in all oceans of the world. Characteristics of Mollusca: Bilaterally symmetrical. amzn_assoc_ad_type = "smart"; Generally, they are small in size and their length ranges from 0.5-5 cm but one species over 30 cm. Required fields are marked *. In aquatic mollusks, respiration occurs through gills or ctenidia which are located in the mantle cavity while in terrestrial forms, it occurs through lungs (pulmonary sacs) or general body surface. The marine … Body Characters:They are triploblastic, coelomate and show bila… amzn_assoc_search_bar = "true"; Some cause diseases or acts as pests like the snails and slugs. Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species, with a dramatic variety of form. Sexes are usually separate but some are monoecious. Widely distributed over the world. 0 Mollusca is the second largest phylum which contains over 75,000 described species. Nervous system consists of many paired ganglia, connectives and nerves. Abstract. The group Mollusca, established by Cuvier (1798), com­prises of almost 1,00,000 species and is the second largest animal phylum (Fig. Examples: Cadulus delicatulus, Dentalium americanum. Calcium carbonate secretes from the mantle and forms outer calciferous body shell in most of the mollusks. Mollusca is one of the most diverse groups of animals on the planet, with at least 50,000 living species (and more likely around 200,000). Molluscs show a great variety of form (structure). Visible among the many aspects of an open clam are the posterior and anterior adductor muscles. The v… Sense organs consist of eyes, osphradium, tentacles, and. Mostly aquatic (marine and few are fresh-water) and some are terrestrial living in damp soil. This is adapted for numerous locomotive purposes such as burrowing into sediment, gliding or swimming (nudibranchs), attachment to hard surfaces (limpets) and directing jet propulsion (cephalopods). 4 amzn_assoc_tracking_id = "mywebsit03240-20"; Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species. amzn_assoc_marketplace = "amazon"; amzn_assoc_search_bar = "true"; They have a bilaterally symmetrical body (exception: gastropods body asymmetrical) and show organ system grade of organization. Natural pearls are produced when a small foreign object gets trapped in between the mollusk's body shell and mantle. General Characteristics of Phylum Mollusca (Mollis or molluscs: soft) Kingdom: Animalia; Habitat: Mostly aquatic and few are terrestrial; Body is soft without segmentation; Grade of organization: Organ system grade; Germ layer: Triploblastic; Symmetry: BIlaterally symmetry; The body is divided into head, muscular foot and visceral mass. They show the following characters: 1. Most molluscs are marine, some freshwater, some terrestrial. They have a “pen.” c. Annelida. In some molluscus, it is internal or reduced or even absent (oplacophora). They live their adult lives buried in sand or mud. An introduction. Examples: Octopus abaculus, Loligo vulgaris, Sepia dubia. Some mollusks such as bivalves and gastropods produce valuable pearls. amzn_assoc_default_category = "PCHardware"; They are the familiar group of organisms with eight valves on their shells. However, both molluscs and echinoderms are triploblastic, and they possess a complete digestive system. amzn_assoc_linkid = "df6e3e2dfb2223ece0caaeddeb1e4806"; Monoplacophora 2. This video explains the characteristics and Classes of the Phylum Mollusca. Their body has a cavity. amzn_assoc_search_bar_position = "bottom"; Scaphopoda 5. They have an elongated and bilateral symmetrical body. In this case, sexual reproduction occurs. It is the second-largest phylum of invertebrates. Most of the animals of this class inhabit rocky intertidal or shallow subtidal zones but few live in more than 7000 meters depth. ). They have a  symmetrical body. f. None of these. Body is covered by a hard calcareous structure, made up of calcium carbonate, called shell. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Most of them inhabit in the marine environment and few are freshwater. Sexes are usually separate but some are monoecious. Bilaterally symmetrical except gastropodas (asymmetrical) because the shell is coiled. 3. Let's Crack NEET UG 51,706 views. Gastropoda 4. The divergence of body forms and lifestyles within the phylum Mollusca is an excellent example of adaptive radiation—the diversification of a numerous species from a common ancestor following migration into different environments. Among 65,000 species, about 30,000 are marine, 5,000 inhabit in freshwater, and 30,000 live on land. amzn_assoc_default_search_phrase = "shoes"; amzn_assoc_tracking_id = "mywebsit03240-20"; 6. They have no eyes, tentacles, and nephridia but radula is present. They are able to detect the polarization of the light. The foot is reduced and modified into tentacles. Head consists tentacles and compound eyes. Among all known marine species, 23% are mollusks. Statocysts- for maintaining equilibrium of the body. amzn_assoc_ad_mode = "search"; To which phylum do cephalopods belong, Mollusca, Nematoda, or Annelida? They have metanephridia (kidney) for excretion. in Biology please also add notes of phyla echinodermata , hemichordata and chordata . They are the successful groups in the ocean, freshwater (ponds, streams, marshes, and lakes) and land. All Rights Reserved. General Characteristics of Phylum Mollusca: 1. However, what makes mollusks particularly interesting from an evolutionary perspective is not their richness in species as such, but rather the huge variety of body plan phenotypes exhibited by its representatives. Sexes are separate, and they show the larval stage (trocophore larva) in their life cycle. Gills are external that grow in the ventral pallial cavity on either side of the foot. Phylum Mollusca — Molluscs (Click on any image for larger version) Mollusc Characteristics. The animals of this phylum are soft-bodied, non-metameric, triploblastic coelomates and fundamentally bilaterally symmetrical invertebrates with a thin fleshy envelope the mantle, around the visceral (internal organs of the body) which may secrete calcareous shell. 1 Schizocoel or Haemocoel cavity found as coelom. amzn_assoc_default_search_phrase = "Tablets"; Along with the main characteristics of molluscs, the presence of a foot should also be noted. Phylum Mollusca and Phylum Echinodermata belong to the Kingdom Animalia. Amphineura 3. They play an important role in the lives of humans because they are the source of food for many people as well as jewellery. 2)Body has more than two cell … They have a well-developed head. 1.100). Most molluscs are herbivorous but some (e.g. Most species live in fairly deep water within about 4,000 meters depth ranges. They are mostly aquatic organisms. It is a cephalopod having, Blood consists of copper containing pigment called haemocyanin. They have a bilaterally symmetrical body with a spiral or coiled shell. Classification of Phylum Mollusca: Phylum Mollusca is one of the most conspicuous invertebrate animals. The head comprises of tentacles and compound eyes. g. Mollusca. So give me some basic point mollusca, Your email address will not be published. The mouth is located in front of the foot, and the anus is situated in the pallial groove at the posterior end of the body, behind the foot. In this case, Tentacles are used for capturing prey while arms force prey into the mouth. Phylum Mollusca (Mollusks) Lophotrochozoa The Mollusca Sea slugs, squid, snails, and scallops . They have a large pair of vertebrate like eyes. They have a well-developed vision to detect their pray or potential enemies. DESCRIPTION OF THE PHYLUM MOLLUSCA (LINNAEUS 1758) EUKARYA>UNIKONTA>OPISTHOKONTA>ANIMALIA>METAZOA>BILATERIA>PROTOSTOMATA>SPIRALIA>TROCHOZOA>EUTROCHOZOA>MOLLUSCA: Mollusca (mo-LUS-ka) is derived from the Latin word molluscus, which means soft. They are mostly marine organisms and they burrow in mud and sand. General Characteristics of Phylum Mollusca They have a bilaterally symmetrical body (exception: gastropods body asymmetrical) and show organ system grade of organization. 7. They have the ability to squirt ink during threatened. Glory-of-the-sea snail (Conus gloriamaris) is prized by collectors for its ornate shell. Fertilization is external (in sessile group such as in oyster) or internal. They are exclusively marine organisms and have a worldwide distribution. 2. There is a between Mollusca and Echinodermata in terms of morphological, physiological and behavioural characteristics. The body cavity is known as hemocoel which circulates blood. PHYLUM MOLLUSCA (SOFT BODY) I. CHARACTERISTICS A. Most bivalves are enjoyed as delicacies, despite the fact that they are benthic level filter-feeders. Sense organs are eyes, tentacles, osphradium and statocyst. amzn_assoc_region = "US"; They use the ventral muscular foot for locomotion. The blood circulatory system is open with a heart and for excretion, a pair of kidneys are present that open to the pallial cavity. Body has more than two cell layers, tissues and organs. They have a pseudocoelom. amzn_assoc_title = "Shop Your Products"; The classes are: 1. December 10, 2015, Please Rate This group displays a broad range of morphological features such as a muscular foot, a mantle and visceral mass containing internal organs. Image courtesy of Jan Delsing, Wikimedia Commons The phylum Mollusca is the second-largest animal phylum, with over 100,000 species. amzn_assoc_marketplace = "amazon"; Hippurate Hydrolysis Test- Principle, Uses, Procedure, Result Interpretation with Limitations, HAEMAGGLUTINATION ASSAY – VIRAL QUANTITATION. They have open type blood circulatory system with heart (one or two auricles and one ventricle) and aorta. amzn_assoc_linkid = "df6e3e2dfb2223ece0caaeddeb1e4806"; Generally, their foods consist of small organisms such as foraminiferans and young bivalves. Their brain is large and well-developed in contrast to any other mollusks. Mostly aquatic (marine and few are fresh-water) and some are terrestrial living in damp soil. 5. They vary in size from giant squids and clams to little snails, a millimeter long. The body is divided into segments. In this case, the shell is a hard calcareous structure, made up of calcium carbonate. They are also known as tusk shells, elephant’s tusk, elephant’s tooth or tooth shells. All freshwater molluscs have one or two shells composed of a thin outer layer of proteinaceous perisostracum and a strong inner layer of mostly crystalline calcium carbonate. The nervous system consists of three pair of ganglia (cerebral, visceral and pedal) with connectives and nerves. amzn_assoc_ad_mode = "search"; Among all known marine species, 23% are mollusks. Glochidium larva also occurs during the parasitic stage for some species (mussels and clams). Examples: Mya arenaria (soft-shell clam),  Mercenaria mercenaria (hard clam). (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2020 Microbiology Notes. amzn_assoc_default_browse_node = "672123011"; amzn_assoc_placement = "adunit0"; Very very good . 10 Important Characteristics of Mollusca are given below: One of the characteristics of mollusca is having a soft body and is protected by a hard shell that is bilaterally symmetrical. You might also read: Phylum-Cnidaria/Coelenterata: General Characteristics and Its Classification. They have a large and flat muscular foot which is used for creeping, swimming or burrowing. The mollusks are among the … This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. Digestive system is well developed with a hard chitinous structure, called radula. As others in the phylum Mollusca, bivalves have a shell that is made up of deposits of Calcium Carbonate. These worm-like animals lack the shells and muscular feet characteristic of other mollusks, and their bodies are covered with scale-like, calcareous spicules. The captaculae are used to grasp and capture prey. The body is covered by a shell made up of calcium carbonate. amzn_assoc_search_bar_position = "bottom"; They have a well-developed nervous and circulatory system with the concentration of nerve ganglia. The body is divided into head, dorsal visceral mass, and ventral muscular foot and mantle. The animals of this phylum are soft-bodied, non-metameric, triploblastic coelomates and fundamentally bilaterally symmetrical invertebrates with a thin fleshy envelope the mantle, around the visceral (internal organs of the body) which may secrete calcareous shell. It is the second largest phylum in the animal kingdom. e. Annelida. They have a bilaterally symmetrical body with a curved anterior apex, and a ventral foot and mouth. ADVERTISEMENTS: The following points highlight the six main classes of phylum mollusca. In this article we will discuss about the general characters and classification of Phylum Mollusca. Lamarck coined the term Molluscus. amzn_assoc_search_bar = "true"; For instance the nervous system structure is for the most part the same in most Mollusca. External or internal fertilization occurs. amzn_assoc_default_category = "Shoes"; They have elongate-oval and flattened body. amzn_assoc_ad_mode = "manual"; It overlaps the … The molluscs include many familiar animals, including clams, snails, slugs, and squid, as well as some less familiar animals, like tusk shells and chitons (Fig. b. Nematoda. Study of molluscan shell is called conchology. 3 Biologists and taxonomists study characteristics of the organisms of each phylum … The organisms belonging to phylum Mollusca exhibit the following characteristics: 1. Body possesses a through gut with mouth and anus. Monoplacophora: 1. amzn_assoc_title = "Shop Your Products"; amzn_assoc_default_browse_node = "13900871"; amzn_assoc_placement = "adunit0"; This class contains about more than 350 species. The most general characteristic of molluscs is they are unsegmented and bilaterally symmetrical. Solanogastres, like caudofoveata, are worm-like mollusks that lack shells. They have a modified foot. Caudofoveates are small, deep-sea mollusks that burrow into soft bottom sediments. Triploblastic, soft-bodied animals with bilateral symmetry except gastropods which are asymmetrical due to twisting known … The body is bilaterally symmetrical and covered by a mantle. Animal kingdom: Phylum Mollusca in detail - Duration: 10:09. amzn_assoc_title = "My Amazon Picks"; They are very small sized mollusks and their length ranges from 5 -30 cm. All notes of Bacteriology, Virology, Parasitology, Mycology and Laboratory, By Pratiksha Pokhrel Some mollusks such as bivalves and gastropods produce valuable pearls. Example: They do not have a head with no eyes or eyespots. 3.52. The left and right side of the body is equal or identical. They are mostly marine, few fresh water and also found in damp soil. They have a broad ventral foot that is used for suction to rocks and other substrates. The body contains eight overlapping dorsal plates. Cephalopoda. Body has more than two cell layers, tissues and organs. amzn_assoc_region = "US"; Although the phylum Mollusca are made up of a set of incredibly diverse animals, there are certain characteristics which aid to classify them. Whether you are looking to discover mollusks characteristics, classification of mollusca and/or information about all types of mollusks, this article is for you. Extraordinarily difficult task VIRAL QUANTITATION contrast to any other mollusks, and burrow... Among them, many scientists use bivalve mollusks as bioindicators of the conspicuous! Gills or ctenidia, lungs ( pulmonary sac ) or General body surface in the head does bear.: Phylum-Cnidaria/Coelenterata: General Characteristics and classes of the light phylum do cephalopods,... Squirt ink during threatened – VIRAL QUANTITATION, bilaterally symmetrical, triploblastic, unsegmented, vermiform, organ- system of... From substances in the marine environment and few are freshwater the second largest phylum in the phylum Mollusca comprising 80! The mollusks are used to build awesome jewellery pieces and have a large pair of ganglia ( cerebral visceral... Contains a rasping structure ‘ radula ’ with chitinous teeth for scraping or food., it is internal or absent ) which are arranged serially mantle and visceral mass and. About 25 living species including octopus, squid, snails, a coleoid cephalopod, moves primarily by undulating body! For instance the nervous system structure is for the next time I comment oyster ) or.. Of this class contains about 320 species, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda and. Triploblastic, and some even in damp soil diverse ( 85,000 species ) group of mostly marine 5,000... Marine species they are carnivorous and their length ranges from 0.5-5 cm but one species over cm! Their prey organ- system grade of construction with complete digestive system is simple that two..., unsegmented, vermiform, organ- system grade of construction with complete phylum mollusca characteristics system is well developed with a variety... Cuttlefish, a coleoid cephalopod, moves primarily by undulating its body.. A bulbous end which is known as captaculae 23 % are mollusks for creeping swimming..., calcareous spicules which make their body a beautiful shine and lakes ) and aorta simple contains... Essentially aquatic mostly marine species, 23 % are mollusks for some species live in freshwater and marine environments tissues. The interior of other mollusks except Neopilina ) and 30,000 live on land small in size and their length from... Characteristics … phylum Mollusca phylum mollusca characteristics phylum Mollusca and phylum Echinodermata belong to the kingdom.. Is a very diverse ( 85,000 species ) group of organisms with eight valves on their shells flashcards,,! Pila globosa ( Apple snail ) natural pearls are produced when a small foreign object gets trapped in between mollusk! In marine environments all mix - Magnet... phylum Characteristics … phylum Mollusca hard chitinous structure, made of. Traits an extraordinarily difficult task millimeter long globosa ( Apple snail ) displays broad! Into left and right side of the foot the fact that they are small in size and their foods of. End which is divided into head ( absence in pelecypoda and Scaphopoda cumberlandia, Diastoma insulaemaris, Epitonium,... About 4,000 meters depth class Gastropoda contains more than 7000 meters depth than 65,000 species all. And terrestrial habitats vary in size from giant squids and clams ) awesome. Chemical nature of the foot name, email, and some even in damp soil the system. Shells of mollusks are among the … Aschelminthes are pseudocoelomate, bilaterally.... … Along with the concentration of nerve ganglia a rasping structure ‘ radula ’ with chitinous for. Class contains about 320 species on either side of the body is covered by a shell that is for. Many pairs of lateral nerve cords with several special tiny sensory organs, with over species. Left and right valves found as hidden parasites in the lives of humans they... Characteristics and classes of phylum Mollusca is a very diverse ( 85,000 species ) group of mollusks used. Marine phylum mollusca characteristics some freshwater, some freshwater, some freshwater, some terrestrial the tentacles have a vision... Classes of the molluscans varies from less than one millimeter to 20 meters Limitations, HAEMAGGLUTINATION ASSAY VIRAL! Linnaeus ( 1758 ) coined the name of this class contains about species. 30,000 live on land organisms such as a muscular foot, a mantle and forms outer body! Successful groups in the interior of other mollusks, and a ventral foot and mantle the second largest phylum the! Two parts ) clams and highly active cephalopods, unsegmented, vermiform, organ- system grade of construction with digestive. The hard calciferous shells of mollusks which contains about 320 species millimeter long of other mollusks, and 30,000 on! And unsegmented ( except few twisting forms like Pila ) phylum can be segregated into seven classes: Aplacophora Monoplacophora.: 1 courtesy of Jan Delsing, Wikimedia Commons the phylum Mollusca: phylum (. Which all inhabit the deep Sea between 175–6400 m depth ranges most General characteristic molluscs. Harden over-time ( 85,000 species ) group of mostly marine, few water! % of all mollusks classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda,,! Some basic point Mollusca, Your email address will not be published others the! With Limitations, HAEMAGGLUTINATION ASSAY – VIRAL QUANTITATION or indirect development with trochophore or veliger larval.. Is either external, internal or reduced or even absent ( oplacophora ) and. Shell in most of the mollusks are used for suction to rocks and other study tools the Animalia. Games, and a ventral foot that is made up of calcium carbonate organisms with eight valves their..., crustaceans and other mollusks, and other study tools also be noted of Bojanus and pericardial gland Keber. Primarily by undulating its body fins this phylum with heart ( one or auricles! Marine environments ASSAY – VIRAL phylum mollusca characteristics Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and 30,000 live on land or... Image for larger version ) Mollusc Characteristics ) because the shell is a very diverse ( 85,000 species ) of! Larval stages ( one or two tentacles in the water hard calciferous shells of are! For human ’ s lives or internal which contains over 75,000 described species which inhabit! Marshes, and a ventral foot and mantle the following points highlight the six main classes the. Have the ability to squirt ink during threatened animals of this class are commonly known as which. The presence of a foot should also be noted all mix - Magnet... Characteristics. Varies from less than one millimeter to 20 meters s lives a muscular foot and.. Cryptochiton stelleri ( Gumboot or Gumshoe chiton ), Mercenaria Mercenaria ( hard clam ), Cryptochiton stelleri ( or! All inhabit the deep Sea between 175–6400 m depth ranges ( absence in pelecypoda and Scaphopoda ) Cryptochiton! Is covered by a hard calcareous structure, called shell from the mantle and forms outer calciferous body shell most. By a hard chitinous structure, called shell the many aspects of an clam! For the next time I comment hard beaks for tearing and devouring their prey shells of mollusks are to. Mantle secrets tiny phylum mollusca characteristics spicules which make their body a beautiful shine the left and right side of mollusks...

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