-Body - Head, Thorax and Abdomen(three parts). Phylum Arthropoda( Jointed Legs) – -Largest phylum. Octopus has 8 arms and contains no shell. Members of the phylum Mollusca are soft-bodied animals, such as the snail, clam, squid, oyster, and octopus. However, both molluscs and echinoderms are triploblastic, and they possess a complete digestive system. It protects the soft body . 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. Some secrete a hard shell. The number of fossil species is estimated between 60,000 and 100,000 additional species. Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. Phylum Mollusca – -Soft body animals. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. -Bilateral symmetry, Triploblastic, segmented coelomate. PHYLUM MOLLUSCA (SOFT BODY) I. CHARACTERISTICS A. Key Points on Mollusca. Phylum Mollusca Characteristics. There is a between Mollusca and Echinodermata in terms of morphological, physiological and behavioural characteristics. Start studying Intro to Mollusca Notes and Class Gastropoda notes. -Excretion by malpighian tubules. ; Statocysts- for maintaining equilibrium of the body. The statocysts maintain body equilibrium. GENERAL CHARACTERISTICS BODY CHARACTERS : Soft Unsegmented Triploblastic No jointed appendages SYMMETRY : Bilaterally symmetrical SHELL : Externally mantle secretes a hard , brittle , calcareous shell . It is primitive with segmented body. Neopilina is considered as connecting link between Annelida and Mollusca. Phylum Mollusca is the second largest phylum. -Blood without haemoglobin and circulatory system open. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Things to remember. 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. Generally, these animals live in water. The group Mollusca, established by Cuvier (1798), comprises of almost 1,00,000 species and is the second largest animal phylum (Fig. Phylum Mollusca. Each mollusk has a muscular organ called a foot that is used for gripping or creeping over surfaces. A few molluscs such as Unio possess green glands which mimic the liver in vertebrates. 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 Many organisms belonging to this phylum have a calciferous shell. Contains snails, slugs, octopus, squid, and the "shell fish" (clams, oysters,limpets, and scallops); second largest phylum (greater than 100,000 species) B. -Respiration by gills, book lungs and trachea. They also possess ink glands for protection. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. 1.100). Phylum Mollusca and Phylum Echinodermata belong to the Kingdom Animalia. 3. ; Unio contains a digestive gland called Green gland, which is comparable to liver of vertebrates. 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