Bivalves include clams, oysters, mollusks, clams, and many other affiliated shell families. Mollusks refer to are a large group of soft-bodied invertebrate animals. The Phylum Mollusca is estimated to include 100,000 species. BIVALVES 1 / Gastropods are single shells coiled around a center axis. The bivalves have sensory cells enabling them to distinguish touch, chemical changes, and light. torsion). Bivalves: A class of marine and freshwater mollusks with compressed bodies within a shell. 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. Although the phylum Mollusca are made up of a set of incredibly diverse animals, there are certain characteristics which aid to classify them. GASTROPODS This class has more than 60 000 unknown species, making it the largest. 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). GASTROPODS This class has more than 60 000 unknown species, making it the largest. The remaining classes (Polyplacophora, Aplacophora, and Monoplacophora) have fewer species. Gastropods make up the largest class of mollusks, and they include both snails and slugs. They are typically divided into ten classes, of which two are extinct. Mollusks are subdivided into seven classes with most species found in three of those classes: Gastropoda, Bivalvia, and Cephalopoda. Whether you are looking to discover mollusks characteristics, classification of mollusca and/or information about all types of mollusks, this article is for you. Monoplacophora Fig. The major classes of living mollusks include gastropods, bivalves, and cephalopods (Figure below). Mollusks are classified by number of shells or foot shape. Types of Mollusks. The Animal Kingdom contains these seven Phyla: Porifera, Cnidaria, Platyhelminthes, Annelida, Mollusca, Arthropoda, and Chordata. The smallest mollusks are snails that are microscopic in size. They are typically divided into ten classes, of which two are extinct. Types of Mollusks. The smallest mollusks are snails that are microscopic in size. The current 7 extant classes include the following. The thorn shell, Acanthina angelica The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. There are approximately 160,000 living species and probably 70,000 extinct species of mollusks. Mollusks are classified by number of shells or foot shape. Gastropods, like slugs and snails, can live on land or in the water. Gastropods include snails. Gastropods include snails. They have three pairs of ganglia and two nerve c ords. The three main types of mollusks are gastropods, bivalves, and cephalopods. 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