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