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phylum mollusca classes pdf

• Foot is broad , flat , disc-like with flat creeping sole . Foot is flat and ventral. (iii) Better developed sense organs such as eyes, statocysts and osphradia. Aplysia, a marine mollusc is commonly known as. Connectives con­nect dissimilar ganglia; however, commissures connect similar ganglia. 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. h�bbd``b`��@�� H�l ��@�0 ��H����4�?�o ڌ� Phylum Mollusca. Content Guidelines 2. Privacy Policy3. :��K&�&�#�?�b��+��惼J��8-+s����Ƀ���/Im!����P-��Eۢ��0��. What is the reserve food material in red algae? 2. Molluscs can be divided into ive principal classes, namely Gastropoda, Bivalvia, Scaphopoda, Polyplacophora and Cephalopoda. 7. 8. (ii) Mantle may be surrounded by shell, and. The phylum Mollusca has about 100,000 described species and potentially 100,000 species yet to be described (Strong et al., 2008). Species representing each of these classes are included in this guide. Share Your PPT File. In male the left arm is spoon shaped and is called hectocotylized which is used to transfer sperms into the female. 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. (i) Shell is present in many individuals, (ii) In some forms, a lungs is present for pulmonary respiration, and. It is a hermaphrodite animal. B head is fused with thorax . kephale- head, podos- foot): Head and foot region combined and modified into a structure which has eyes and eight tentacles, hence the name cephalopod or ‘head foot’. pelekus- hatchet Podos foot): Unio, Mytilus (Sea mussel), Teredo SpwoS EnZ (razor shell or razor clam), Solen (razor fish or razor shell), Ostrea (edible oyster), Pecten (scallop), Pinctada (Pearl oyster). Among the molluscs, cuttle fish are exceptional in having closed blood vascular system. Deuterostomes (like the echinoderms) 2. Eight Vertebrate Classes 5. Neopilina is a segmented mollusc. Its shell yields an excellent quantity of lime the shells of the fresh water mussels are used in the manufacture of buttons. Pelecypoda or Lamellibranchiate or Bivalvia (Gk. Shell is secreted by mantle. A whitish elevation in each valve is called umbo. Shell is internal. It is nocturnal and herbivorous. They have die characters of both the phylum Annelida and phylum Mollusca. eucoelomates; protostomes great size variation great diversity & adaptive radiation monas- one, plax- plate, pherein- bearing): The shell is spoon or cup shaped. The sexes are generally separate but some are hermaphrodite. Phylum Mollusca has been divided into following six classes on the basis of foot, shell and mantle. Shell may be external (e.g., most of molluscs), internal (e.g., slug, cuttle fish, squid) or absent (e.g., Octopus). 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). %PDF-1.5 %���� Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? 52 0 obj <>/Filter/FlateDecode/ID[<872E2FCD5300F8449209B98516DCCF31>]/Index[44 21]/Info 43 0 R/Length 60/Prev 25964/Root 45 0 R/Size 65/Type/XRef/W[1 2 1]>>stream 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. It is a thin, fleshy fold of dorsal body wall more or less covering the body. The slug is a plant pest. Thus it is adapted for both aquatic and terrestrial life. Neopilina is a “connecting link” between Annelida and Mollusca. The lines of growth indicate the age of the individual. Monoplacophora (Gk. Phylum Mollusca is the second largest animal phylum. Only the gastropods have entered the terrestrial habitat, and some families of snails and mussels are commensalistic. Chiton is marine and found attached to rocks by its foot the shell consists of a row of eight plates. They are bilaterally symmetrical, triploblastic and coelomate animal. Mollusca is the largest marine phylum, comprising about 23% of all the named marine organisms. They exhibit organ system level of organization. They are mostly found in marine and fresh water. • There are 8 known living classes of molluscs and new species are constantly being discovered. Pila has osphradium which is meant for testing chemical and physical nature of water. Thus, the annelids are the evolutionary precursor of molluscs. When the animal is attacked ink-like fluid is ejected through the funnel to form a smoke cloud. Octopus ejects an inky fluid in water and forms a screen for defence from its enemies. The shell is absent. endstream endobj 45 0 obj <> endobj 46 0 obj <> endobj 47 0 obj <>stream They have die characters of both the phylum Annelida and phylum Mollusca. The shell of sepia is used as a source of calcium for pet birds. It is found in rivers, lakes and ponds. It includes such familiar organisms as snails, octopuses, squid, clams, scallops, oysters, and chitons. Class 1. Cephalopods are regarded at the top of invertebrates evolution in terms of learned behaviour they exihibit. A “living fossil” named Neopilina discovered in 1952 from the Pacific Ocean, shows metameric segmentation which is not a characteristic of molluscs. Our mission is to provide an online platform to help students to share notes in Biology. Very few are terrestrial found in damp soil. Phylum Mollusca Classes: Gastropoda, Bivalvia, Cephalopoda. 3. Sepia, Loligo, octopus, nautilus, (pearly nautilus). Like Sepia, it is also found in the warm seas. The thorn shell, Acanthina angelica The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. The animal is omnivorous feeding on microscopic organisms. to the class Demospongiae. black mussel. Phylum Mollusca Class Bivalvia Oysters, Clams, Scallops-Oh My! However, it is not a legal authority for statutory or regulatory purposes. A foot is located on head . Animals: Phylum Mollusca; Ziser Lecture Notes, 2015.10 Class: Monoplacophora means: “one plate” 25 species small; 3mm to 3 cm fossils known from Cambrian àwas believed to be an extinct group until discovered near Costa Rica in 1952 small, single, low rounded shell with ventral creeping foot superficially resemble limpets (gastropods) Metameric segmentation and presence of the trochophore larva in both annelids and molluscs suggest that molluscs have descended from the annelids. 0 The six major mollusc classes CLASS 1 : MONOPLACOPHORA CLASS 2 : AMPHINEURA CLASS 3 : SCAPHOPODA CLASS 4 : GASTROPODA CLASS 5 : PELECYPODA OR BIVALVIA CLASS 6 : CEPHALOPODA 6. Name the 6 classes in the phylum Mollusca. amphi- both + two neuron = nerve): South Africa has recorded 347 sponge species, comprising around 4% of sponge diversity worldwide. However, local taxonomic knowledge of this phylum is largely incomplete. Ammonia is chief excretory matter. Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda.The members are known as molluscs or mollusks (/ ˈ m ɒ l ə s k /).Around 85,000 extant species of molluscs are recognized.

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