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 Your email address will not be published.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

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