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-Body - Head, Thorax and Abdomen(three parts). There is a between Mollusca and Echinodermata in terms of morphological, physiological and behavioural characteristics. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Each mollusk has a muscular organ called a foot that is used for gripping or creeping over surfaces. It is primitive with segmented body. Generally, these animals live in water. -Respiration by gills, book lungs and trachea. 3. Phylum Mollusca – -Soft body animals. PHYLUM MOLLUSCA (SOFT BODY) I. CHARACTERISTICS A. Phylum Mollusca. It protects the soft body . The number of fossil species is estimated between 60,000 and 100,000 additional species. Octopus has 8 arms and contains no 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 2 nd largest animal phylum after Arthropoda. 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. -Bilateral symmetry, Triploblastic, segmented coelomate. Phylum Arthropoda( Jointed Legs) – -Largest phylum. Members of the phylum Mollusca are soft-bodied animals, such as the snail, clam, squid, oyster, and octopus. They also possess ink glands for protection. Start studying Intro to Mollusca Notes and Class Gastropoda notes. A few molluscs such as Unio possess green glands which mimic the liver in vertebrates. Neopilina is considered as connecting link between Annelida and Mollusca. Phylum Mollusca is the second largest phylum. The statocysts maintain body equilibrium. Phylum Mollusca Characteristics. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. Key Points on Mollusca. However, both molluscs and echinoderms are triploblastic, and they possess a complete digestive system. Phylum Mollusca 1. Contains snails, slugs, octopus, squid, and the "shell fish" (clams, oysters,limpets, and scallops); second largest phylum (greater than 100,000 species) B. 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. Phylum 2. They possess osphradia to test the chemical nature of water. The proportion of undescribed species is very high. -Excretion by malpighian tubules. GENERAL CHARACTERISTICS BODY CHARACTERS : Soft Unsegmented Triploblastic No jointed appendages SYMMETRY : Bilaterally symmetrical SHELL : Externally mantle secretes a hard , brittle , calcareous shell . Some secrete a hard shell. The group Mollusca, established by Cuvier (1798), com­prises of almost 1,00,000 species and is the second largest animal phylum (Fig. Learn vocabulary, terms, and more with flashcards, games, and other study tools. -Blood without haemoglobin and circulatory system open. Things to remember. Many organisms belonging to this phylum have a calciferous shell. 1.100). ; Statocysts- for maintaining equilibrium of the body. ; Unio contains a digestive gland called Green gland, which is comparable to liver of vertebrates. 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