Classification: Phylum Mollusca has been divided into following six classes on the basis of foot, shell and mantle. Pelecypoda or Bivalvia. 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 organisms belonging to phylum Mollusca exhibit the following characteristics: 1. 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. Coelom development, 5. 3. Study of Mollusca is called Malacology. Class: Monoplacophora. Name: Snails belong to the Mollusca Phylum 3. Class 1. Very few are terrestrial found in damp soil. 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. They can be found in terrestrial regions as well as in the depths of the seas. But few of them such as snails and slugs are pests. c) … Presense or absence of Notochord. Molluscs are found in nearly all freshwater and marine environments, and some are found also on land. Phylum Mollusca are divided into six classes. b) Veliger. GENERAL CHARACTERISTICS BODY CHARACTERS : Soft Unsegmented Triploblastic No jointed appendages SYMMETRY : Bilaterally symmetrical SHELL : Externally mantle secretes a hard , brittle , calcareous shell . 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. Their size ranges from microscopic organisms to organisms 20 metres long. The bivalve molluscs are used as bioindicators in the marine and freshwater environments. Mollusks refer to are a large group of soft-bodied invertebrate animals. 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. monas- one, plax- plate, pherein- bearing): The shell is spoon or cup shaped. Diploblastic and Triploblastic Organisation, 4. They are generally oviparous with indirect development. The marine … Monoplacophora (Gr., monos, one+ plax, plate+ pherein, bearing) Mollusca are one of the organisms that have an exoskeleton, which is made of chitin, such as the shells of snails. 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. It contains a dorsal longitudinal keel or crest. The sexes are separate in most of the molluscs but some species are hermaphrodites. • • Mollusca clams, snails, squids, and relatives (Also: molluscs) Here is an overview of the phylum Mollusca that includes the classification of Mollusca, Mollusca characteristics, and Mollusca examples. The bodies are generally very soft and are covered by the hard exoskeleton. 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. 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 head comprises of tentacles and compound eyes. 7. 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… Main article: Mollusc shell. Class 1. They are sluggish invertebrates, with a thin fleshy envelope or mantle covering the visceral organs. It is a major group in the animal kingdom as regards the number which occu­pies next to arthropods. Lamarck coined the term Molluscus. 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. 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. Performance & security by Cloudflare, Please complete the security check to access. Your email address will not be published. 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. The organisms belonging to phylum Mollusca exhibit the following characteristics: They are mostly found in marine and freshwater. Classification of Phylum Mollusca: Phylum Mollusca is one of the most conspicuous invertebrate animals. The statocysts maintain body equilibrium. Mollusca is considered to the second-largest phylum of animals after Arthropoda and are invertebrates. 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. These organisms are found in the terrestrial as well as in deep seas. These are devoid of the head, shell, mantel, nephridia, and foot. a) Trochophore. The group Mollusca, established by Cuvier (1798), com­prises of almost 1,00,000 species and is the second largest animal phylum (Fig. Octopus has 8 arms and contains no shell. The study of Mollusca is called Malacology. Your IP: 66.198.240.60 It includes such familiar organisms as snails, octopuses, squid, clams, scallops, oysters, and chitons. They have a pair of metanephridia that helps in excretion. Your email address will not be published. The tentacles, eyes, osphradium, and statocysts act as the sensory organs. Very few are terrestrial and found in moist soil. These animals continue to have an important role in the lives … Their body is dorsoventrally flattened like a leaf, and are bilaterally symmetrical. Mantle and mantle cavity. Animal Phylum Annelida Phylum Arthropoda Phylum Mollusca Phylum Echinodermata 1. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Natural pearls are formed within these molluscs. The mantle cavity, a fold in the mantle, encloses a significant amount of space. The body is divided into segments. 1. Neopilina galatheae It was discovered in 1952 from the Pacific Ocean at a depth of 3,500 metres on the coast of … The term Mollusca was first applied by Aristotle to cuttle fish. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. You may need to download version 2.0 now from the Chrome Web Store. 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. Mollusc means soft. Class 1 Crustacea (Crusta: shell) Habitat: They are mostly aquatic, few are terrestrial and very few are parasitic. Monoplacophora (Gk. 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This class comprises more than 15000 species including mussels, oysters, … 2. (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. Classification of Phylum Mollusca. Study of molluscan shell is called conchology. June 11, 2017 Gaurab Karki Class 11, Zoology 0. Although the phylum M ollusca are made up of a set of incredibly diverse animals, there are certain characteristics which aid to … Classification of phylum molluscs and Important classes of phylum molluscs They are found either on land or in fresh and marine water. Definition of Molluscs: Phylum Mollusca is a group of invertebrates which has fascinated man from the dawn of civili­zation. Phylum Mollusca Class Pelecypoda Pelecypods have two shells, or bivalves, that protect the soft parts of the animal. Classification of Phylum Arthropoda. 3. They are mostly found in marine and fresh water. Many organisms belonging to this phylum have a calciferous shell. Sol: (c) Mytilus belongs to class Pelecypoda of phylum Mollusca… Respiration occurs through gills which are externally located. The animals belonging to the phylum Mollusca have soft-bodies, triploblastic and bilaterally symmetrical and coelomate. Another way to prevent getting this page in the future is to use Privacy Pass. Of the roughly 100,000 known mollusk species, about 70,000 are gastropods, and 20,000 are bivalves or 90 percent of the total. Shell. Segmentation of the body and 6. Arthropoda is classified into five classes on the basis of body divisions, body appendages, habitat, organs of respiration and modes of excretion. Complete the table below by inserting the common name of the Animal in column #1 and place an X in its matching Phylum. 1.100). Cloudflare Ray ID: 5fb8f9a4af507e67 The … Name: Spiders belong to the Anthropod Phylum 4. They play a very important role in the lives of humans. The term Mollusca was derived from the term given by Aristotle to cuttlefish. They are a source of jewellery as well as food. 3.51 A). Fertilization may be external or internal. They are marine. Image courtesy of Jan Delsing, Wikimedia Commons The phylum Mollusca is the second-largest animal phylum, with over 100,000 species. torsion). Fig. 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 exhibit organ system level of organization. The body is covered by a shell made up of calcium carbonate. Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species, with a dramatic variety of form. Name: Earthworm belongs to the Annelida phylum 2. they have foot along with ventricle structure for locomotion. Glory-of-the-sea snail (Conus gloriamaris) is prized by collectors for its ornate shell. The body is covered by a calcareous shell. Phylum MOLLUSCA Class MONOPLACOPHORA, Ex. The shell is composed of 8 longitudinal plates. Hypothetical ancestral mollusc. They possess osphradia to test the chemical nature of water. 8. Phylum Mollusca 1. 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 Shell consists of single piece or valve. Identify the larva which is present only in members of gastropods. Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. The v… 1. The thorn shell, Acanthina angelica The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. They also possess ink glands for protection. They exhibit organ system level of organization. Foot is flat and ventral. Symmetry, 3. Levels of Organisation, 2. To know more about Mollusca, keep visiting BYJU’S website or download BYJU’S app for further reference. Required fields are marked *. They respire through the general body surface, gills or pulmonary sac. They have a well-developed digestive system, the radula is the rasping organ for feeding. 5. Body is segmented and bilaterally symmetrical. The head is devoid of eyes and tentacles. The head bears tentacles, eyes, and a mouth. The shell is either external, internal, or not present at all. Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. The broad classification of Animalia based on common fundamental features: The body is bilaterally symmetrical and compressed laterally. 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. They are mostly found in the marine environment. The valves are generally of equal size (except in groups like the oysters) and shape and are hinged at the back. The nitrogenous waste is excreted out through nephridia. The body is divided into head, dorsal visceral mass, and ventral muscular foot and mantle. Their body has a cavity. Amphineura: It is a small class of marine molluscs dating back from the Cambrian period. Phylum 2. Phylum Mollusca: General Characteristics and Classification. 6. 4. The blood circulates through the open circulatory system. Following are the classification of Mollusca: The body is cylindrical or bilaterally symmetrical. Classification of Animal Kingdom is based on various fundamental features like – 1. The body is divided into head, visceral mass, muscular foot and mantle. Following are a few examples of the animals belonging to phylum Mollusca: Phylum Mollusca is the second largest phylum. It is from these two families that most people derive their general perception of mollusks as small, slimy creatures equipped with calcareous shells. Classification of Phylum Mollusca Phylum Mollusca is a very diverse (85,000 species) group of mostly marine species. The members of this group have adapted either on land or in water. The head comprises of tentacles and compound eyes. A few molluscs such as Unio possess green glands which mimic the liver in vertebrates. 3.52. The blood is blue or green in colour due to the presence of a pigment containing copper called haemocyanin. It protects the soft body . The nervous system consists of number of paired ganglia and nerves.
2020 classification of phylum mollusca