Phylogeny and phylogenetic relationship of phylum mollusca. Mollusks body, used, water, process, life, animals. Some grownups cant see magic ponies but children can explanation. Learn mollusca 2 classes with free interactive flashcards. Circle the letter of each sentence that is true about mollusks. The first class includes the gastropods, a group of land snails and slugs. They can be found in terrestrial regions as well as in the depths of the seas. Session objectives phylum vii mollusca general characteristics examples of molluscs classification of phylum mollusca. Understand the taxonomic relationships and major features of mollusks learn the external and internal anatomy of the clam and squid. Choose from 500 different sets of mollusca 2 classes flashcards on quizlet. A study of the type series of nautilus pompilius linnaeus, 1758 mollusca, cephalopoda, nautilida svetlana v. Freshwater molluscs are classified into gastropods snails and freshwater limpets and several groups of.
Structure soft bodied animals name from latin word mollus meaning soft. The phylum mollusca has about 100,000 described species and potentially 100,000 species yet to be described strong et al. The body is divided into head, muscular foot and visceral mass. Monoecious and dioecious, but usually produce eggs that hatch. The below mentioned article provides notes on mollusca snail. Aplacophora, monoplacophora, polyplacophora, bivalvia, gastropoda, cephalopoda, and scaphopoda.
Many, however, occur in fresh water and some even in damp soil. Body structure of phylum mollusca, class xi, biology. Annelida post lab 7 phyla mollusca and annelida name sec 11 point name the four classes of phylum mollusca then name a. Consensus phylogeny of mollusc classes as supported by the phylogenomic anlayses of kocot et al. General characteristics of phylum mollusca mollis or molluscs. Today the phylum of mollusca is divided into eight different classes, six of which are exclusive marine living in the sea.
Classification of mollusca april, 97 1 victor millard a classification of the living mollusca which was compiled by kay cunningham vaught and published by american malacologists, inc melbourne. Mnemonic classes and subclasses of phylum mollusca in. Pdf the paper gives an overview of the modern hypotheses on the origin of the phylum mollusca and the formation of its main classes. Animals in phylum mollusca have an open circulatory system, but also often have a heart that pumps blood. This volume is a reprint of a classic book about nautilus, first published in 1987, with an introductory chapter summarizing all of the work on nautilus and its habitat since the publication of. Around 85,000 extant species of molluscs are recognized. 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. Body structure of phylum mollusca, class xi, biology, chapter animal kingdom extramarks. Mollusca is the second largest phylum of invertebrate animals. Only bivalves and gastropods have been able to adapt to life in fresh water bivalves.
Classification can be great fun and not as utterly boring as it sometimes turns out to be. Aplacophora, monoplacophora, polyplacophora, bivalvia, gastropoda, cephalopoda, and. Mollusca molluscs a phylum of coelomate see coelom invertebrates comprising classes which are morphologically quite diverse, including the amphineura, bivalvia, cephalopoda, gastropoda. Pdf origin and the early evolution of the phylum mollusca. Dichotomous keymollusca wikibooks, open books for an. Its fun if you can understand the need for it and how its done. In this article we will discuss about the general characters and classification of phylum mollusca. Molluscs can be divided into five principal classes, namely gastropoda, bivalvia, scaphopoda. Mollusca soft bodied are marine or freshwater or terrestrial johnston coined the name mollusca. Phylum mollusca the mollusca include chitons, clams, oysters, snails, slugs, squids, nautilus and octopuses. The heart is key to keep the blood pressure regulated. Many of these first molluscs were but simple, wormlike animals. Classes in phylum mollusca phylum mollusca is a very diverse 85,000 species group of mostly marine species, with a dramatic variety of form.
Clams the general clam is apart of the bivalvia subsection of the mollusca phylum. Phylum mollusca objective type questions pdf download. Most bivalves are filter feeders taking all floating particles out of the water column. Many organisms belonging to this phylum have a calciferous shell. All animals of the phylum mollusca have bilateral symmetry. The smallest bivalves are microscopic and the largest are 4 feet across. Radula is going to drill holes in oyster and clam shells.
The phylum mollusca is the second largest in the animal kingdom including about 100,000 living species and with a long fossil record of some 35,000 more. I have recorded the very best easy lecture for you on the topic of phylum mollusca that will be very helpful for you to understand better you can find the. Phylum mollusca mcq multiple choice question and answer phylum mollusca mcq with detailed explanation for interview, entrance and competitive exams. Bilateral symmetrical, unsegmented with definite head 2. Mollusks belong to the phylum mollusca and make up the second largest group of invertebrates animals lacking backbones after the arthropods. Three big protostome phyla annelids, arthropods, molluscs 2. The bodies are generally very soft and are covered by the hard exoskeleton. Mollusca is the secondlargest phylum of invertebrate animals after the arthropoda. Phylum mollusca is divided into eight classes, all but one of which are extant.
481 1234 989 902 1070 1416 835 775 148 145 943 697 865 846 1542 350 581 1491 410 246 905 1252 1276 958 907 1348 1144 1041 1199 536 1138 823 800