Molluscs are found in nearly all freshwater and marine environments, and some are found also on land. It contains a dorsal longitudinal keel or crest. Mollusca is considered to the second-largest phylum of animals after Arthropoda and are invertebrates. They exhibit organ system level of organization. Phylum Mollusca: General Characteristics and Classification. They can be found in terrestrial regions as well as in the depths of the seas. Glory-of-the-sea snail (Conus gloriamaris) is prized by collectors for its ornate shell. Classification of phylum molluscs and Important classes of phylum molluscs Respiration occurs through gills which are externally located. 3.51 A). 6. These are devoid of the head, shell, mantel, nephridia, and foot. The body is divided into segments. Phylum Mollusca 1. Their body has a cavity. Although the phylum M ollusca are made up of a set of incredibly diverse animals, there are certain characteristics which aid to … Another way to prevent getting this page in the future is to use Privacy Pass. Classification of Phylum Mollusca Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species. Shell. These animals continue to have an important role in the lives … Arthropoda is classified into five classes on the basis of body divisions, body appendages, habitat, organs of respiration and modes of excretion. Study of molluscan shell is called conchology. The broad classification of Animalia based on common fundamental features: Fertilization may be external or internal. Many organisms belonging to this phylum have a calciferous shell. They have a well-developed digestive system, the radula is the rasping organ for feeding. You may need to download version 2.0 now from the Chrome Web Store. Definition of Molluscs: Phylum Mollusca is a group of invertebrates which has fascinated man from the dawn of civili­zation. 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. Coelom development, 5. Hypothetical ancestral mollusc. It protects the soft body . Along with the insects and vertebrates, mollusks are one of the most diverse groups in the animal kingdom, with nearly 100,000 (possibly as many as 150,000) described species. (a) Mytilus belongs to class Arthropoda of phylum Mollusca (b) Mytilus belongs to class Amphineura of phylum Mollusca (c) Mytilus belongs to class Pelecypoda of phylum Mollusca (d) Mytilus belongs to class Echinodermata of phylum Mollusca. 5. Body is segmented and bilaterally symmetrical. Mollusks refer to are a large group of soft-bodied invertebrate animals. 3. Classification of Phylum Arthropoda. The term Mollusca was derived from the term given by Aristotle to cuttlefish. The head is devoid of eyes and tentacles. The … Your IP: 66.198.240.60 It is from these two families that most people derive their general perception of mollusks as small, slimy creatures equipped with calcareous shells. Identify the larva which is present only in members of gastropods. The bivalve molluscs are used as bioindicators in the marine and freshwater environments. The body is covered by a calcareous shell. Diploblastic and Triploblastic Organisation, 4. Amphineura: It is a small class of marine molluscs dating back from the Cambrian period. 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. 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 secret… The mantle cavity, a fold in the mantle, encloses a significant amount of space. They possess osphradia to test the chemical nature of water. The head bears tentacles, eyes, and a mouth. Mollusks may be primitively segmented, but all but the monoplacophorans characteristically lack segmentation and have bodies that are to some degree spirally twisted (e.g. To know more about Mollusca, keep visiting BYJU’S website or download BYJU’S app for further reference. monas- one, plax- plate, pherein- bearing): The shell is spoon or cup shaped. Animal Phylum Annelida Phylum Arthropoda Phylum Mollusca Phylum Echinodermata 1. Name: Snails belong to the Mollusca Phylum 3. June 11, 2017 Gaurab Karki Class 11, Zoology 0. The body is bilaterally symmetrical and compressed laterally. 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). The bodies are generally very soft and are covered by the hard exoskeleton. Shell consists of single piece or valve. Main article: Mollusc shell. They are mostly found in marine and fresh water. Mollusca clams, snails, squids, and relatives (Also: molluscs) They are a source of jewellery as well as food. Following are a few examples of the animals belonging to phylum Mollusca: Phylum Mollusca is the second largest phylum. The study of Mollusca is called Malacology. 1. The nitrogenous waste is excreted out through nephridia. The blood is blue or green in colour due to the presence of a pigment containing copper called haemocyanin. torsion). The head comprises of tentacles and compound eyes. You will be amazed to know that the size of the molluscans can range from 20 metres to one millimetre, with a few microscopic animals too. Presense or absence of Notochord. 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. It includes such familiar organisms as snails, octopuses, squid, clams, scallops, oysters, and chitons. Of the roughly 100,000 known mollusk species, about 70,000 are gastropods, and 20,000 are bivalves or 90 percent of the total. They are sluggish invertebrates, with a thin fleshy envelope or mantle covering the visceral organs. Your email address will not be published. This class comprises more than 15000 species including mussels, oysters, … Very few are terrestrial found in damp soil. Phylum Mollusca are divided into six classes. Mollusca are one of the organisms that have an exoskeleton, which is made of chitin, such as the shells of snails. The statocysts maintain body equilibrium. Fig. They also possess ink glands for protection. Pelecypoda or Bivalvia. The tentacles, eyes, osphradium, and statocysts act as the sensory organs. 3.52. The sexes are separate in most of the molluscs but some species are hermaphrodites. Very few are terrestrial and found in moist soil. Levels of Organisation, 2. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. The body is divided into head, visceral mass, muscular foot and mantle. Mollusc means soft. Following are the classification of Mollusca: The body is cylindrical or bilaterally symmetrical. Your email address will not be published. They are generally oviparous with indirect development. The organisms belonging to phylum Mollusca exhibit the following characteristics: 1. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. The body is covered by a shell made up of calcium carbonate. The blood circulates through the open circulatory system. Mollusks are soft-bodied invertebrates of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body. 7. The organisms belonging to phylum Mollusca exhibit the following characteristics: They are mostly found in marine and freshwater. They have a pair of metanephridia that helps in excretion. It is a major group in the animal kingdom as regards the number which occu­pies next to arthropods. GENERAL CHARACTERISTICS BODY CHARACTERS : Soft Unsegmented Triploblastic No jointed appendages SYMMETRY : Bilaterally symmetrical SHELL : Externally mantle secretes a hard , brittle , calcareous shell . a) Trochophore. Sol: (c) Mytilus belongs to class Pelecypoda of phylum Mollusca… The head comprises of tentacles and compound eyes. 2. Classification of Phylum Mollusca: Phylum Mollusca is one of the most conspicuous invertebrate animals. Their body is dorsoventrally flattened like a leaf, and are bilaterally symmetrical. They play a very important role in the lives of humans. The tusk shells or tooth shells, technically the Scaphopoda / s k æ ˈ f ɒ p ə d ə / (the scaphopods / ˈ s k æ f ə p ɒ d z /, from Ancient Greek σκᾰ́φης skáphē "boat" and πούς poús "foot"), are members of a class of shelled marine mollusc with worldwide distribution, and are the only class of exclusively infaunal marine molluscs. Here is an overview of the phylum Mollusca that includes the classification of Mollusca, Mollusca characteristics, and Mollusca examples. The shell is either external, internal, or not present at all. Required fields are marked *. Class 1 Crustacea (Crusta: shell) Habitat: They are mostly aquatic, few are terrestrial and very few are parasitic. The shell is composed of 8 longitudinal plates. 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If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. Octopus has 8 arms and contains no shell. Performance & security by Cloudflare, Please complete the security check to access. c) … Complete the table below by inserting the common name of the Animal in column #1 and place an X in its matching Phylum. Cloudflare Ray ID: 5fb8f9a4af507e67 If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Class 1. Their size ranges from microscopic organisms to organisms 20 metres long. Phylum MOLLUSCA: 1. class Aplacophora 2. class Polyplacophora 3. class Monoplacophora 4. class Gastropoda (Prosobanchia, Opisthobranchia, Pulmonata) 5. class Bivalvia (Protobranchia, Lamellibranchia, Septibranchia) 6. class Scaphopoda (tusk shells) 7. class Cephalopoda (Nautilodea, Ammonoidea, Coleoidea) Classification: Phylum Mollusca has been divided into following six classes on the basis of foot, shell and mantle. Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species, with a dramatic variety of form. They are found either on land or in fresh and marine water. • 4. Phylum Mollusca Classification Mollusca (mollusks) are classified into 6 classes according to their symmetry and the characters of food, shell, mantle, gills, nervous system, muscles, and radula. Monoplacophora (Gk. Classification of Phylum Mollusca. Segmentation of the body and 6. b) Veliger. The body is divided into head, dorsal visceral mass, and ventral muscular foot and mantle. The marine … 1.100). 8. Study of Mollusca is called Malacology. Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species. 3. They exhibit organ system level of organization. Name: Spiders belong to the Anthropod Phylum 4. Monoplacophora (Gr., monos, one+ plax, plate+ pherein, bearing) The valves are generally of equal size (except in groups like the oysters) and shape and are hinged at the back. Natural pearls are formed within these molluscs. Phylum 2. Neopilina galatheae It was discovered in 1952 from the Pacific Ocean at a depth of 3,500 metres on the coast of … Image courtesy of Jan Delsing, Wikimedia Commons The phylum Mollusca is the second-largest animal phylum, with over 100,000 species. The members of this group have adapted either on land or in water. Phylum Mollusca Class Pelecypoda Pelecypods have two shells, or bivalves, that protect the soft parts of the animal. They respire through the general body surface, gills or pulmonary sac. They are mostly found in the marine environment. Symmetry, 3. These organisms are found in the terrestrial as well as in deep seas. The nervous system consists of number of paired ganglia and nerves. Class 1. Phylum MOLLUSCA Class MONOPLACOPHORA, Ex. Mollusca has at least 50,000 species, although it is estimated that there are more than 200,000, such as clams, oysters, snails, and octopuses. The animals belonging to the phylum Mollusca have soft-bodies, triploblastic and bilaterally symmetrical and coelomate. An open circulatory system is present in some molluscs for the blood circulation through vessels and also some have closed circulatory systems to move blood through the body enclosed entirely in blood vessels. Classification of Animal Kingdom is based on various fundamental features like – 1. But few of them such as snails and slugs are pests. 1. Name: Earthworm belongs to the Annelida phylum 2. Mantle and mantle cavity. they have foot along with ventricle structure for locomotion. The v… Foot is flat and ventral. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. A few molluscs such as Unio possess green glands which mimic the liver in vertebrates. The thorn shell, Acanthina angelica The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. The group Mollusca, established by Cuvier (1798), com­prises of almost 1,00,000 species and is the second largest animal phylum (Fig. Classification of Mollusca: A classification of world wide Mollusca : Page(s): 1-544 : Publisher: Victor Millard : Publication Place: South Africa : ISBN/ISSN: 0-620-21261-6 Class: Monoplacophora. Lamarck coined the term Molluscus. They are marine. The term Mollusca was first applied by Aristotle to cuttle fish. •

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