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