phylum mollusca notes

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