classify phylum mollusca upto class level with examples
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Mollusks (Phylum Mollusca): Characteristics and Facts
Snails, Sea Slugs, Octopuses, and Oysters
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Octopus in aquarium against the glass
Stephanie Hager/HagerPhoto/Photolibrary/Getty Images
by
Jennifer Kennedy
Updated March 04, 2019
Mollusca is a taxonomic phylum that contains a diverse array of organisms (referred to as "mollusks"), and the taxonomic classes that include snails, sea slugs, octopuses, squid, and bivalves such as clams, mussels, and oysters. From 50,000 to 200,000 species are estimated to belong to this phylum. Imagine the obvious differences between an octopus and a clam, and you'll get an idea of the diversity among mollusks. Mollusks also belong to the kingdom Animalia.
Fast Facts: Mollusks
Scientific Name: Mollusca
Distinguishing Characteristics: Most have a shell and soft body as well as a distinguishable head and foot region; they use their muscular foot to move
Size: Varies from less than 1 millimeter (0.04 inch) for solenogasters and gastropods to 135 centimeters (4 feet) for the giant clam.
Lifespan: Varies from an average of 3 years up to 507 years for the Arctica islandica.
Region and Habitat: From shallow coastal waters to the deepest parts of the oceans, worldwide. Most live in the bottom sediments, though cephalopods are primarily free-swimming species.
Phylum: Mollusca
Classes: Gastropoda, Bivalvia, Aplacophora, Monoplacophora, Polyplacophora, Scaphopoda, Cephalopoda
Orders: There are 97 orders in the phylum Mollusca.
Conservation status: Least concern; mollusks make up nearly one-fourth of all marine animals on Earth.
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