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Phylum: Mollusca Mollusca itself has 9 classifications, with 7 extant representativies and 2 extinct classes. Mollusks are subdivided into seven classes with most species found in three of those classes: Gastropoda, Bivalvia, and Cephalopoda. Mollusks refer to are a large group of soft-bodied invertebrate animals. Bivalves include clams, oysters, mollusks, clams, and many other affiliated shell families. The Animal Kingdom contains these seven Phyla: Porifera, Cnidaria, Platyhelminthes, Annelida, Mollusca, Arthropoda, and Chordata. GASTROPODS This class has more than 60 000 unknown species, making it the largest. There are approximately 160,000 living species and probably 70,000 extinct species of mollusks. The bodies of animals are made up of differentiated tissues to perform an equally specialized task, sometimes in to or three levels of differentiation (excluding sponges). Bivalves: A class of marine and freshwater mollusks with compressed bodies within a shell. They have three pairs of ganglia and two nerve c ords. The bivalves have sensory cells enabling them to distinguish touch, chemical changes, and light. Mollusks are classified by number of shells or foot shape. Mollusks may be primitively segmented, but all but the monoplacophorans characteristically lack segmentation and have bodies that are to some degree spirally twisted (e.g. torsion). There are approximately 160,000 living species and probably 70,000 extinct species of mollusks. The current 7 extant classes include the following. Gastropods include snails. Gastropods make up the largest class of mollusks, and they include both snails and slugs. Types of Mollusks. The major classes of living mollusks include gastropods, bivalves, and cephalopods (Figure below). Phylum: Mollusca Mollusca itself has 9 classifications, with 7 extant representativies and 2 extinct classes. GASTROPODS This class has more than 60 000 unknown species, making it the largest. The thorn shell, Acanthina angelica The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. The study of mollusks is called malacology (mal-uh-col-oh-gee) which means “the study of animals with soft bodies.” The seven living classes of mollusks are Aplacophora, Bivalva, Cephalopoda, Gastropoda, Monoplacophora, Polyplacophora and Scaphopoda. Although the phylum Mollusca are made up of a set of incredibly diverse animals, there are certain characteristics which aid to classify them. The three main types of mollusks are gastropods, bivalves, and cephalopods. Whether you are looking to discover mollusks characteristics, classification of mollusca and/or information about all types of mollusks, this article is for you. The remaining classes (Polyplacophora, Aplacophora, and Monoplacophora) have fewer species. Gastropods include snails. 1 / Gastropods are single shells coiled around a center axis. Mollusks are classified by number of shells or foot shape. The current 7 extant classes include the following. They are typically divided into ten classes, of which two are extinct. The smallest mollusks are snails that are microscopic in size. BIVALVES Types of Mollusks. The Phylum Mollusca is estimated to include 100,000 species. Monoplacophora Fig. The smallest mollusks are snails that are microscopic in size. They are typically divided into ten classes, of which two are extinct. Gastropods, like slugs and snails, can live on land or in the water. : Mollusca Mollusca itself has 9 classifications, with 7 extant representativies and 2 classes..., like slugs and snails, can live on land or in the water ) have fewer species up... Fewer species most species found in three of those classes: Gastropoda, Bivalvia, and light characteristics aid! Probably 70,000 extinct species of mollusks chemical changes, and cephalopods ( Figure below ) are microscopic size! 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