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. Some also serve as intermediate hosts for parasitic trematodes, and others (e.g., snails) can be major agricultural pests. Lamellidense, commonly known as mus­sels, belong to phylum-Mollusca, class — Bivalvia, and subclass — Palaeoheterodonta. Bivalvia. Greenhouse Effect. Class 1 Polychaeta (Polys: many; chaite:hair) Habitat: They are marine, terrestrial, and freshwater. Respiration . Class 11 Notes Download Pdf : 1 : Symmetry: Distribution of body parts around a : 2 : hypothetical axis. 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 . Download Phylum - Mollusca MCQ Question Answer PDF « Phylum Mollusca . 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. Most mollusks are herbivores, carnivores or filter feeders Protection Run away, hide in shell, release ink, secrete poisonous or distasteful chemicals, sting, camouflage . Most molluscs are herbivorous but some (e.g. Unregimented and covered with calcareous shell. Animal Kingdom Classification System . • Molluscs are soft bodied animals, often with hard shells for protection. Snails, slugs, sea slugs Snail Conch Slug Whelk Abalone 4. The mantle comprises of two lateral halves — called mantle lobes. Study of molluscan shell is called conchology. Phylum Mollusca . Animal Kingdom Classification System Class 11 Notes Download Pdf. • Many species can actively change their skin color or naturally blend into their surroundings. Feather like gills are present between hump and mantle. 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… • … Cephalopoda. They are usually white, long and thin. Mollusca, Echino & Arthro / Mollusca, Echinodermata, Arthropoda notes Click Phylum Mollusca, Echinodermata, Arthropoda NOTES_2015-1.pdf link to view the file. 1. Three major classes make up the phylum Mollusca. Most mollusks have well-developed nervous systems with large brains and sense organs. Cell Biology. Phylum Mollusca. Nerves & Synapses. In this article we will discuss about the general characters and classification of Phylum Mollusca. Chapter 4 Animal Kingdom . 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 These 64 slides will provide your students with a solid lesson on the animals found in the Phylum Mollusca and their characteristics. Class . 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. Geothermal. Vertebrates share certain physical characteristics: They have backbones, an internal skeleton (endoskeleton) for muscle attachment and growth, and muscles. Lamarck coined the term Molluscus. Archetypical protosome development (schizocoely). Members of this phylum include snails, octopuses, squids, oysters etc. Biology notes for O level. Gastropoda. You are on page 1 of 35. They include fish, amphibians, reptiles, birds, and mammals. Many, however, occur in fresh water and some even in damp soil. Kidney Function. Phylum Mollusca. These are solitary or colonial (usually). Class . ADVERTISEMENTS: 2. Habitat: They are mostly marine. They usually burrow in the mud at the bottom of the pond. 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. Home Search Pdf Classification > Cells Enzymes ... Phylum Nematodes Nematodes are worms, but unlike annelids their bodies are not divided into segments. More than 500,000 known species. They are fresh water bivalves of India. Search inside document . The word “mollusc” means “soft thing”. Animal Kingdom Classification System Class 11 Notes Download In PDF ☞ Class 12 Solved Question paper 2020 ☞ Class 10 Solved Question paper 2020. Phylum Mollusca. 249-320. Body divided into head, muscular foot and visceral hump. True coelomates (schizocoelomates). 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. Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. Estimates of the number of species alive today range from 50,000 to 130,000. Many organisms belonging to this phylum have a calciferous shell. Download Now. • There are 8 known living classes of molluscs and new species are constantly being discovered. 2. Bilaterally symmetry, segmented worms. Polyplacophora. Comparing Transport in Plants & Animals. chitons. General Characteristics of Phylum Mollusca Mollusca (Molluscus- soft bodies) Study of Mollusca is called Malacology. Jump to Page . Phylum - Mollusca MCQ Question with Answer Phylum - Mollusca MCQ with detailed explanation for interview, entrance and competitive exams. Class- Gastropoda - “stomach foot” Has one shell or none Ex. Biology Notes for IGCSE 2014. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and … Inside the shell, a delicate layer called mantle envelops the whole visceral mass. Phylum Mollusca is the second largest animal phylum after Arthropoda. Phylum Mollusca Classification Mollusca (mollusks) are classified into 6 classes according to their symmetry and the characters of food, shell, mantle, … 3. procrastination.ppt. 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 … 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 . 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. squid) are active predators. Phylum Mollusca - From mollus meaning “soft” 2. Most of these animals have a closed digestive system with only one opening, and a true coelom. PHYLUM MOLLUSCA (SOFT BODY) I. CHARACTERISTICS A. Snails. They are terrestrial or aquatic (both marine and freshwater). 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. Phylum Mollusca “Soft Body” • _____ Major Classes – _____ -- Tooth, tusk shell – _____ (_____) -- Clams, mussels, oysters The term Mollusca was first applied by Aristotle to cuttle fish. Mollusca Notes 1. Unit 11 - Phylum Mollusca – Guided Notes General Characteristics • Three body parts: o _____Æmuscular foot: _____ May be modified in squid and octopus PDF | On Jan 1, 2016, Richard C. Brusca and others published Phylum Mollusca | Find, read and cite all the research you need on ResearchGate Contains snails, slugs, octopus, squid, and the "shell fish" (clams, oysters,limpets, and scallops); second largest phylum (greater than 100,000 species) B. The body is cylindrical or vase shaped with bristly outer surface. Class . Class . They live in many different habitats. Class Bivalvia - “Two Shells” Ex. Soft body of Molluscs. Vertebrate and Invertebrate Animal Structure Notes (6 ... Vertebrates comprise only one phylum of animals. Energy Flow in Ecosystems. Explanation are given for understanding. The diversity of the phylum is shown by at least eight known classes (cover). Classes in Phylum Mollusca. Many nematodes live in the soil. Phylum Annelida is divided into four main classes, primarly on the basis of setae, parapodia, metameres and other morphological features. Nucleic Acids. Classification Kingdom- Animalia Phylum- Mollusca 4 classes: 3. • They are one of the most diverse phyla, second only to Arthropods (insects, crabs, shrimp, and others). Most are familiar to you as food sources: oysters, clams, scallops, and yes, snails, squid and octopods. General Characteristics of Phylum Mollusca: 1. All animals of the phylum Mollusca have bilateral symmetry. Molluscs have soft bodies and this explains the name of the phylum. The phylum Mollusca consists of over 100,000 marine, freshwater, and terrestrial species. Body Form: The body of molluscs is un-segmented with a distinct head, muscular foot and visceral hump. Phylum Mollusca has been classified differently by different authors depending upon the characters of foot, mantle, shell, muscles, radula, nervous system and respira­tory organs.