There are three distinct body zones: a head-foot, a visceral mass and a mantle. It was first applied by Ariistotle to the cuttle-fish of the Aegean Se. The head comprises of tentacles and compound eyes. 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 Mollusks is one of the most fascinating and diverse animal groups on our planet. Visit the mollusca pages on the Tree of Life for more on molluscan systematics. Body is soft,unsegmented,bilaterally symmetrical and divisible into head,foot,mantle and visceral mass. Body have jointed appendages or legs (which are modified to different structures to perform different functions like jaws, gills, walking legs, paddle). 6. Main characteristics of Mollusca : A ll modern mollusks have the same fundamental body plan. – A mantle cavity between the mantle and the internal organs; the anus, reproductive, and excretory ducts open into the mantle cavity. Class 1. The marine … There is a between Mollusca and Echinodermata in terms of morphological, physiological and behavioural characteristics. Bivalves are aquatic animals, and different species of bivalve… Phylum Mollusca has been classified differently by different authors depending upon the characters of foot, mantle, shell, muscles, radula, nervous system and respira­tory organs. The phylum Mollusca is composed of a variety of organisms. phylum mollusca pdf notes Uncategorised December 3, 2020 0 Comment December 3, 2020 0 Comment Glory-of-the-sea snail (Conus gloriamaris) is prized by collectors for its ornate shell. But all Molluscs have the same basic structure. Very few are terrestrial found in damp soil. Phylum Mollusca, known as mollusks, are a group of invertebrate animals that include slugs, snails, mussels, octopus, bivalves, gastropods, etc. Monoplacophora (Gr., monos , one+ plax , plate+ pherein , bearing) These animals continue to have an important role in the lives … The … Their body has a cavity. Clade Mollusca General Characteristics - true coelom - triploblastic - open circulatory system (except cephalopods that have closed circulatory systems) - suspension feeding (bivalvia) - exoskeleton - exhibit adaptive radiation. Gastropoda 40,000 sp Bivalvia 7,650 sp Other 5 Classes ~1100 Polyplacophora Cephalopoda Molluscan Taxonomic Classes Gastropoda Scaphopoda Bivalvia and Aplacophora Monoplacophora Cretaceous Triassic Class- Gastropoda - “stomach foot” Has one shell or none Ex. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and … You are on page 1 of 35. Body Characters:They are triploblastic, coelomate and show bila… Mollusca (mollusks) are classified into 6 classes according to their symmetry and the characters of food, shell, mantle, gills, nervous system, muscles, and radula. 1.) The body has a head, a foot and a visceral mass. What 4 traits are in all mollusks? They share 3 major sets of characteristics: Body enclosed by a blanket-like mantle that ... – PowerPoint PPT presentation. Chapter 4 Animal Kingdom . Body is unsegmented (except Neoplina) and bilaterally symmetrical (except few twisting forms like Pila ). Body without cavity. Ø About 1,00,000 Species Found. Conchology : Study of shell of Mollusca Most molluscs are marine, some freshwater, some terrestrial. shell (reduced in some species) 2.) They are mostly aquatic but some are terrestrial. Architeuthis-largest invertebrate-commonly called as giant squid Inhabited all habitats except Air Molluscans came into existence in the early … 3.51 A). squid) are active predators. You may have seen or even eaten an oyster or scallop. Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. Biologists and taxonomists study characteristics of the organisms of each phylum in … Most molluscs are herbivorous but some (e.g. The bodies are generally very soft and are covered by the hard exoskeleton. 10.1.General characters of Phylum Mollusca The name Mollusca (in Latin mollis = soft), was first used by the French Zoologist, Cuvier in 1798 to describe squids and cuttlefish, animals whose shell is reduced and internal or entirely absent. They have organ system grade of body organization. 7. General Characteristics • 50,000 or more species of molluscs. 1. General features: They are commonly called soft bodied animals. 3.52. It is the second-largest phylum of invertebrates. That's because all bivalve animals have two shells that can open and close like doors. Amphineura: It is a small class of marine molluscs dating back from the Cambrian period. The giant squid is the largest invertebrate animal. Molluscs show a great variety of form (structure). 4. General characteristics of Phylum Annelida They have homonomous metamerically segmented body. 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. Phylum Mollusca and Phylum Echinodermata belong to the Kingdom Animalia. • They share 3 major sets of characteristics: – Body enclosed by a blanket-like mantle that secretes a shell made of calcium or some other stiff structure. 5. A bivalve is an animal belonging to the class Bivalvia. Ø 80000 Extinct species of Mollusca. A mantle cavity between the mantle and the internal organs; the anus, reproductive, and excretory ducts open into the mantle cavity. GENERAL CHARACTERS & CLASSIFICATION OF MOLLUSCA Introduction : Mollusca includes soft bodied ani­mals. They have red colored body due to the presence of haemoglobin in blood. They can be found in terrestrial regions as well as in the depths of the seas. 2. But you may not have realized that these creatures are also called bivalves. General Characters :- Ø Second Largest Phyla of Animal kingdom. Classes in Phylum Mollusca. 8. They are mostly found in marine and fresh water. The body is covered by a shell made up of calcium carbonate. 10 Important Characteristics of Mollusca are given below: One of the characteristics of mollusca is having a soft body and is protected by a hard shell that is bilaterally symmetrical. Mollusca: General Characteristics! The Moiluscans are soft bodied, triploblastic coelomate & bilaterally symmetrical animals. The body is divided into segments. PHYLUM : : MOLLUSCA GENERAL CHARACTERS : • Soft bodied triploblastic, bilaterally symmetrical, unsegmented schizocoelomates are - Molluscs • True coelomate unsegmented soft bodied animals-Mollusca• Study of mollusca - Malacology • Second largest phylum - Mollusca • Study of Molluscan shells - Choncology • Jhonson created the name Mollusca for - Cephalopods and barnacles This phylum is attributed to 85,000 species with tens of thousands of extinct Mollusca species. They are mostly marine, few fresh water and also found in damp soil. This is all covered with a mantle (also known as a pallium) that typically secretes the shell. This phylum has 50,000 living species. Triploblastic, soft-bodied animals with bilateral symmetry except gastropods which are asymmetrical due to twisting known as torsion. Phylum Mollusca General Characteristics 50,000 or more species of molluscs. head-foot Head is distict bearing mouth,eyes and tentacles. 3. They exhibit organ system level of organization. You likely know them as shellfish. General Characteristics 50,000 or more species of molluscs. Fig. Mollusca general characters 1. General Characteristics of Mollusca Aquatic,mostly marine, very less fresh water forms. Many organisms belonging to this phylum have a calciferous shell. Morphology Despite their amazing diversity, all molluscs share some unique characteristics that define their body plan. However, both molluscs and echinoderms are triploblastic, and they possess a complete digestive system. The v… There are only three characteristics shared by all living mollusks: the presence of a mantle (the rear covering of the body) that secretes calcareous (e.g., calcium-containing) structures; the genitals and anus opening into the mantle cavity; and paired nerve cords. INTRODUCTION The term Mollusca was coined by Aristotle The term Mollusca was defined by Cuvier Soft bodied animals. They share 3 major sets of characteristics: Body enclosed by a blanket-like mantle that secretes a shell made of calcium or some other stiff structure. Image courtesy of Jan Delsing, Wikimedia Commons The phylum Mollusca is the second-largest animal phylum, with over 100,000 species. They include slow-moving snails and slugs bivalved (shell with two parts) clams and highly active cephalopods. Some common features are : Unsegmented soft body with bilateral symmetry; Presence of an internal or external shell; A toothed tongue (made mostly of chitin) called the radula The organisms belonging to phylum Mollusca exhibit the following characteristics: 1. It is the second largest phylum in the animal kingdom. They show the following characters: 1. The phylum Mollusca consists of over 100,000 marine, freshwater, and terrestrial species. Molluscs are found in nearly all freshwater and marine environments, and some are found also on land. 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mollusca general character

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