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