They also possess ink glands for protection. Phylum Arthropoda( Jointed Legs) – -Largest phylum. A few molluscs such as Unio possess green glands which mimic the liver in vertebrates. Phylum Mollusca and Phylum Echinodermata belong to the Kingdom Animalia. 3. Phylum Mollusca 1. Start studying Intro to Mollusca Notes and Class Gastropoda notes. The statocysts maintain body equilibrium. Neopilina is considered as connecting link between Annelida and Mollusca. They possess osphradia to test the chemical nature of water. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. Each mollusk has a muscular organ called a foot that is used for gripping or creeping over surfaces. -Blood without haemoglobin and circulatory system open. It is primitive with segmented body. Phylum Mollusca is the second largest phylum. Phylum 2. Contains snails, slugs, octopus, squid, and the "shell fish" (clams, oysters,limpets, and scallops); second largest phylum (greater than 100,000 species) B. Many organisms belonging to this phylum have a calciferous shell. ; Statocysts- for maintaining equilibrium of the body. -Respiration by gills, book lungs and trachea. Octopus has 8 arms and contains no shell. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. PHYLUM MOLLUSCA (SOFT BODY) I. CHARACTERISTICS A. It protects the soft body . Members of the phylum Mollusca are soft-bodied animals, such as the snail, clam, squid, oyster, and octopus. The proportion of undescribed species is very high. Key Points on Mollusca. 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. -Body - Head, Thorax and Abdomen(three parts). Generally, these animals live in water. Some secrete a hard shell. -Bilateral symmetry, Triploblastic, segmented coelomate. 2 nd largest animal phylum after Arthropoda. GENERAL CHARACTERISTICS BODY CHARACTERS : Soft Unsegmented Triploblastic No jointed appendages SYMMETRY : Bilaterally symmetrical SHELL : Externally mantle secretes a hard , brittle , calcareous shell . Soft-bodied invertebrate covered with protective mantle that may or may not form a hard, calcium carbonate shell; Includes chitons, snails, slugs, clams, oysters, squid, octopus, & nautilus; Second largest animal phylum; Have a muscular foot for movement which is modified into tentacles for squid & octopus Learn vocabulary, terms, and more with flashcards, games, and other study tools. Things to remember. Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. ; Unio contains a digestive gland called Green gland, which is comparable to liver of vertebrates. Phylum Mollusca Characteristics. There is a between Mollusca and Echinodermata in terms of morphological, physiological and behavioural characteristics. The group Mollusca, established by Cuvier (1798), com­prises of almost 1,00,000 species and is the second largest animal phylum (Fig. Phylum Mollusca – -Soft body animals. 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. -Excretion by malpighian tubules. However, both molluscs and echinoderms are triploblastic, and they possess a complete digestive system. The number of fossil species is estimated between 60,000 and 100,000 additional species. 1.100).
Gold Bolts Ratchet And Clank Ps2, How To Build A Quarter Turn Staircase, Luxury Condos For Rent, Usability Test Executive Summary, Pioneer Hdj-2000 Mk2 Vs Sennheiser Hd 25, Which Of The Following Is Not A Bivalve?, Anatomy Of E Commerce Slideshare, Systems Of Equations Maze Version 2 Substitution Method Answer Key, Month To Month Rentals, Alder Ridge Apartments,