There is a between Mollusca and Echinodermata in terms of morphological, physiological and behavioural characteristics. The statocysts maintain body equilibrium. The group Mollusca, established by Cuvier (1798), comprises of almost 1,00,000 species and is the second largest animal phylum (Fig. -Body - Head, Thorax and Abdomen(three parts). Contains snails, slugs, octopus, squid, and the "shell fish" (clams, oysters,limpets, and scallops); second largest phylum (greater than 100,000 species) B. Members of the phylum Mollusca are soft-bodied animals, such as the snail, clam, squid, oyster, and octopus. 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. The proportion of undescribed species is very high. Things to remember. Start studying Intro to Mollusca Notes and Class Gastropoda notes. However, both molluscs and echinoderms are triploblastic, and they possess a complete digestive system. Phylum Arthropoda( Jointed Legs) – -Largest phylum. It is primitive with segmented body. Phylum Mollusca is the second largest phylum. 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 It protects the soft body . Phylum Mollusca and Phylum Echinodermata belong to the Kingdom Animalia. 2 nd largest animal phylum after Arthropoda. -Respiration by gills, book lungs and trachea. Neopilina is considered as connecting link between Annelida and Mollusca. Each mollusk has a muscular organ called a foot that is used for gripping or creeping over surfaces. -Bilateral symmetry, Triploblastic, segmented coelomate. They possess osphradia to test the chemical nature of water. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. The number of fossil species is estimated between 60,000 and 100,000 additional species. Phylum Mollusca – -Soft body animals. Octopus has 8 arms and contains no shell. Key Points on Mollusca. Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. They also possess ink glands for protection. Phylum Mollusca. Phylum 2. ; Unio contains a digestive gland called Green gland, which is comparable to liver of vertebrates. 3. Phylum Mollusca 1. ; Statocysts- for maintaining equilibrium of the body. -Blood without haemoglobin and circulatory system open. Many organisms belonging to this phylum have a calciferous shell. Learn vocabulary, terms, and more with flashcards, games, and other study tools. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. Generally, these animals live in water. Some secrete a hard shell. -Excretion by malpighian tubules. 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. 1.100). GENERAL CHARACTERISTICS BODY CHARACTERS : Soft Unsegmented Triploblastic No jointed appendages SYMMETRY : Bilaterally symmetrical SHELL : Externally mantle secretes a hard , brittle , calcareous shell . PHYLUM MOLLUSCA (SOFT BODY) I. CHARACTERISTICS A. Phylum Mollusca Characteristics. 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