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Phylum Mollusca has been classified differently by different authors depending upon the characters of foot, mantle, shell, muscles, radula, nervous system and respira­tory organs. Chapter 4 Animal Kingdom . You are on page 1 of 35. Class- Gastropoda - “stomach foot” Has one shell or none Ex. The phylum Mollusca consists of over 100,000 marine, freshwater, and terrestrial species. Feather like gills are present between hump and mantle. Most molluscs are herbivorous but some (e.g. Phylum Mollusca . The diversity of the phylum is shown by at least eight known classes (cover). All animals of the phylum Mollusca have bilateral symmetry. Search inside document . They are usually white, long and thin. Kingdom Animalia – Notes on the 9 Phyla • Animals are multicellular • Eukaryotes, cells lack cell walls • Heterotrophs • Diploid (except gametes) • (No cell wall, no alternation of generations, no gametophytes) • 2 groups: invertebrates & vertebrates Most have… • … Home Search Pdf Classification > Cells Enzymes ... Phylum Nematodes Nematodes are worms, but unlike annelids their bodies are not divided into segments. The bodies are generally very soft and are covered by the hard exoskeleton.They can be found in terrestrial regions as well as in the depths of the seas.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. On the basis of the chemical nature of spicules types of the skeleton they possess, phylum porifera has been further divided into the following classes:- Class 1 :Calcarea:-These are exclusively marine and mostly live in shallow seawater. Phylum Mollusca Classification Mollusca (mollusks) are classified into 6 classes according to their symmetry and the characters of food, shell, mantle, … Many nematodes live in the soil. Most are familiar to you as food sources: oysters, clams, scallops, and yes, snails, squid and octopods. Classes in Phylum Mollusca. Cell Biology. Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. General Characteristics of Phylum Mollusca: 1. Explanation are given for understanding. Snails. Bivalvia. Class . Bilaterally symmetry, segmented worms. Study of molluscan shell is called conchology. The body is cylindrical or vase shaped with bristly outer surface. Vertebrates share certain physical characteristics: They have backbones, an internal skeleton (endoskeleton) for muscle attachment and growth, and muscles. Contains snails, slugs, octopus, squid, and the "shell fish" (clams, oysters,limpets, and scallops); second largest phylum (greater than 100,000 species) B. Mollusca, Echino & Arthro / Mollusca, Echinodermata, Arthropoda notes Click Phylum Mollusca, Echinodermata, Arthropoda NOTES_2015-1.pdf link to view the file. • There are 8 known living classes of molluscs and new species are constantly being discovered. They are fresh water bivalves of India. Molluscs have soft bodies and this explains the name of the phylum. Most of the shells found on the beaches of the modem world belong to mollusks and mollusks are probably the most abundant invertebrate animals in modern oceans. Phylum Mollusca - From mollus meaning “soft” 2. Phylum - Mollusca MCQ Question with Answer Phylum - Mollusca MCQ with detailed explanation for interview, entrance and competitive exams. Biology Notes for IGCSE 2014. They live in many different habitats. • Molluscs are soft bodied animals, often with hard shells for protection. PDF | On Jan 1, 2016, Richard C. Brusca and others published Phylum Mollusca | Find, read and cite all the research you need on ResearchGate Phylum Annelida is divided into four main classes, primarly on the basis of setae, parapodia, metameres and other morphological features. Phylum Mollusca In: Atkinson LJ and Sink KJ (eds) Field Guide to the Ofshore Marine Invertebrates of South Africa, Malachite Marketing and Media, Pretoria, pp. Download Phylum - Mollusca MCQ Question Answer PDF « Habitat: They are mostly marine. Kidney Function. procrastination.ppt. Body Form: The body of molluscs is un-segmented with a distinct head, muscular foot and visceral hump. 249 1 University of KwaZulu-Natal, School of Life Sciences, Pietermaritzburg, South Africa 2 Southern Underwater Research Group, Kommetjie, Cape Town 3 South African Environmental Observation Network, Egagasini Node, Cape … Some also serve as intermediate hosts for parasitic trematodes, and others (e.g., snails) can be major agricultural pests. 2. Animal Kingdom Classification System . Snails, slugs, sea slugs Snail Conch Slug Whelk Abalone 4. Most mollusks are herbivores, carnivores or filter feeders Protection Run away, hide in shell, release ink, secrete poisonous or distasteful chemicals, sting, camouflage . General Characteristics of Phylum Mollusca Mollusca (Molluscus- soft bodies) Study of Mollusca is called Malacology. Mollusca Notes 1. They are terrestrial or aquatic (both marine and freshwater). Gastropoda. Biology notes for O level. Most of these animals have a closed digestive system with only one opening, and a true coelom. Three major classes make up the phylum Mollusca. The mantle comprises of two lateral halves — called mantle lobes. Unregimented and covered with calcareous shell. Characteristics •Soft-bodied invertebrate covered with protective mantle that may or may not form a hard, calcium carbonate shell •Second largest animal phylum •Have a muscular foot for movement which is modified into tentacles for squid & octopus •Complete, one-way digestive tract with a mouth & anus . Animal Kingdom Classification System Class 11 Notes Download In PDF ☞ Class 12 Solved Question paper 2020 ☞ Class 10 Solved Question paper 2020. Most mollusks have well-developed nervous systems with large brains and sense organs. These are solitary or colonial (usually). Download Now. Phylum Mollusca. Animal Kingdom Classification System Class 11 Notes Download Pdf. Class . ADVERTISEMENTS: 2. Class 11 Notes Download Pdf : 1 : Symmetry: Distribution of body parts around a : 2 : hypothetical axis. Polyplacophora. Members of this phylum include snails, octopuses, squids, oysters etc. PHYLUM MOLLUSCA (SOFT BODY) I. CHARACTERISTICS A. Phylum Mollusca is the second largest animal phylum after Arthropoda. squid) are active predators. True coelomates (schizocoelomates). Nerves & Synapses. Soft body of Molluscs. Jump to Page . 249-320. Class Bivalvia - “Two Shells” Ex. Class . Animal Kingdom Organ. Living fossils- Limulus (king crab) {Animal Kingdom Notes for NEET} Phylum Mollusca Terrestrial or aquatic, organ level of organization, bilaterally symmetrical, triploblastic and coelomate. Lamellidense, commonly known as mus­sels, belong to phylum-Mollusca, class — Bivalvia, and subclass — Palaeoheterodonta. chitons. Phylum Mollusca. Phylum Mollusca : General Characteristics and Classification (L., mollis=soft) Second largest phylum in number ; first being arthropoda; Malacology : Study of Mollusca ; Conchology : Study of shell of Mollusca ; Most molluscs are marine, some freshwater, some terrestrial. Phylum Mollusca . More than 500,000 known species. Nucleic Acids. • They are one of the most diverse phyla, second only to Arthropods (insects, crabs, shrimp, and others). Unit 11 - Phylum Mollusca – Guided Notes General Characteristics • Three body parts: o _____Æmuscular foot: _____ May be modified in squid and octopus Phylum Mollusca. • Many species can actively change their skin color or naturally blend into their surroundings. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and … These 64 slides will provide your students with a solid lesson on the animals found in the Phylum Mollusca and their characteristics. They usually burrow in the mud at the bottom of the pond. 1. Phylum Mollusca means “soft body” 100,000 species of mollusks often called “shellfish” basic body plan-have soft body divided into 4 major parts 1. head-contains mouth & sensory organs 2. foot-used for movement 3. visceral mass-contains internal organs 4. mantle-thin layer of tissue that covers visceral mass & protects organs; also, secretes calcium carbonate for shell 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 vertebrates, which you will examine later in the semester Section 21.5 Figure 21.15 Key features Mollusks Are Soft and Unsegmented. Energy Flow in Ecosystems. Classification Kingdom- Animalia Phylum- Mollusca 4 classes: 3. The term Mollusca was first applied by Aristotle to cuttle fish. Many, however, occur in fresh water and some even in damp soil. Estimates of the number of species alive today range from 50,000 to 130,000. Cephalopoda. Class 1 Polychaeta (Polys: many; chaite:hair) Habitat: They are marine, terrestrial, and freshwater. Class . Geothermal. In this article we will discuss about the general characters and classification of Phylum Mollusca. Phylum Mollusca “Soft Body” • _____ Major Classes – _____ -- Tooth, tusk shell – _____ (_____) -- Clams, mussels, oysters Respiration . Inside the shell, a delicate layer called mantle envelops the whole visceral mass. Body divided into head, muscular foot and visceral hump. Comparing Transport in Plants & Animals. The word “mollusc” means “soft thing”. Vertebrate and Invertebrate Animal Structure Notes (6 ... Vertebrates comprise only one phylum of animals. Phylum Mollusca 3 embryonic germ layers true coelom complete gut second largest phylum of animals, around 100,000 species mainly aquatic, but some terrestrial species . They include fish, amphibians, reptiles, birds, and mammals. Archetypical protosome development (schizocoely). Many organisms belonging to this phylum have a calciferous shell. Greenhouse Effect. Lamarck coined the term Molluscus. 3.

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