endobj 46 0 obj <> endobj 47 0 obj <>stream It will also be used to setup a comparison between the major classes (Gastropoda, Bivalvia, Cephalopoda, and Polyplacophora) and to introduce discussion about the role of the mollusks in the ecosystem. The shell is absent. Head is without eyes and tentacles. Shell is external (Nautilus), internal (sepia) or absent (octopus). Plate 108 = Phylum: Mollusca, Class: Pelecypoda -- Sculpturing on shell surfaces. LxAigo is edible. Phylum MOLLUSCA, class Polyplacophora: (poly - plax - pherein) CHITONS, 500 spp., (all similar in ecology & morphology) mm's - >35cm, common at low levels on rocky shores, can crawl when immersed in water, clamp to a substrate when emmersed. Metameric segmentation and presence of the trochophore larva in both annelids and molluscs suggest that molluscs have descended from the annelids. (ii) Mantle may be surrounded by shell, and. black mussel. Sep 23, 2019; 2 min read; Respiration In Mollusca Pdf Download In male the left arm is spoon shaped and is called hectocotylized which is used to transfer sperms into the female. :��K&�&�#�?�b��+��惼J��8-+s����Ƀ���/Im!����P-��Eۢ��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. Classification of Phylum Mollusca: Phylum Mollusca are divided into six classes. The body of molluscs is un-segmented with a distinct head, muscular foot and visceral hump. cuttlefish. It is found in rivers, lakes and ponds. The development is either direct or indirect (metamorphosis). Among the molluscs, cuttle fish are exceptional in having closed blood vascular system. Aplysia, a marine mollusc is commonly known as. It is open type. eucoelomates; protostomes great size variation great diversity & adaptive radiation Pelecypoda or Bivalvia. Biology 18 Spring, 2008 1 Lab 5: Phylum Mollusca Objectives: Understand the taxonomic relationships and major features of mollusks Learn the external and internal anatomy of the clam and squid Understand the major advantages and limitations of the exoskeletons of mollusks in relation to the hydrostatic skeletons of worms and the endoskeletons of 7. It includes dorsal heart, arteries that open into sinuses; (spaces) and veins. Sepia, Loligo, octopus, nautilus, (pearly nautilus). Eight Vertebrate Classes 5. There are present two siphons posteriorly. 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 C head is located on foot . amphi- both + two neuron = nerve): It is made up of calcium carbonate. They are bilaterally symmetrical, triploblastic and coelomate animal. The body is divided into head, dorsal visceral mass, and ventral muscular foot and mantle. 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. sea hare. (iii) Better developed sense organs such as eyes, statocysts and osphradia. A pear-shaped ink-sac containing the ink-like fluid is present. 7. Spaces amongst the viscera (soft organs) contain blood and form haemocoel. Numerous molluscs also live in freshwater and terrestrial habitats. Share Your PPT File. It kills its prey with poisonous saliva. 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. Mantle and pulmonary sae (in semi-terrestrial form). When the development is indirect it includes a characteristic larva, liger, trochophore or glochidium. scapha- boat, podos-foot): Class 4. The shell is univalve and almost always coiled. Cephalopods are regarded at the top of invertebrates evolution in terms of learned behaviour they exihibit. The giant squid has the largest eye in the animal kingdom. 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) Phylum Mollusca is the second largest animal phylum. Mollusca is comprised of approximately 200,000 described living species, making it one of the largest animal phyla, and consists of eight living classes that are predominantly marine, with gastropods and bivalves the only ones to have spread to freshwater. Monoplacophora (Gk. The animal is omnivorous feeding on microscopic organisms. It damages seedlings, tender shoots and leaves. Phylum Mollusca are divided into six classes. It also ejects a dark ink to form a smoke cloud to escape from .the enemy. monas- one, plax- plate, pherein- bearing): The shell is spoon or cup shaped. Phylum Mollusca. It is a marine mollusc. It includes such familiar organisms as snails, octopuses, squid, clams, scallops, oysters, and chitons. They are marine. to the class Demospongiae. It also has internal shell Largest.living invertebrate is giant squid (Architeuthis) up to 18 meters long. (iii) Nervous system consists of cerebral, visceral, pleural and pedal ganglia. Before sharing your knowledge on this site, please read the following pages: 1. 1. Why does plant cell possess large sized vacuole? The key difference between Mollusca and Echinodermata relies on the habitat of the organisms belonging to these two classes.Molluscs live in both terrestrial and aquatic environments while echinoderms live strictly in marine environments. Deuterostomes (like the echinoderms) 2. Amphineura (Gk. 64 0 obj <>stream Neopilina is a “connecting link” between Annelida and Mollusca. Gastropoda (Gk. Amphineura (Gk. The body is divided into segments. The lines of growth indicate the age of the individual. Class 11 Biology Animal Kingdom: Phylum Mollusca: Phylum Mollusca. torsion). This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. The mouth or aperture of the shell is closed by a flat and oval plate, the operculum. When the animal is attacked ink-like fluid is ejected through the funnel to form a smoke cloud. Statocysts (balancing organs) may be present. One of the arms of male is spoon shaped and is called hectocotylized which is used to transfer sperms into the female. 44 0 obj <> endobj Shell is internal. Mollusca. They are oviparous. In many molluscs, eyes are present over stalks called ommatophores. Phylum Mollusca Class Bivalvia Oysters, Clams, Scallops-Oh My! 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