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What are the 3 main body parts of a mollusk? Their shells have also been used as money in some preindustrial societies. Mollusks are a major food source for other organisms, including humans. There are seven classes of Mollusks: Monoplacophora, Polyplacophora, Aplacophora, Gastropoda, Scaphapoda, Bivalvia and Cephalopoda. answer choices Gastropod Bivalve Cephalopod Oxygen-rich blood will appear blue, and oxygen-poor blood will appear colorless because of the presence of copper compounds within the hemocyanin. In chitons and monoplacophorans (but not in the caudofoveates and the solenogasters) the heart is also the site of the purifying ultrafiltration, and the waste products are then discharged into the pericardium and via a pair of pericardial outlets modified to excretory organs (emunctoria, such as false kidneys or nephridia). Shelled molluscs therefore predate the earliest trilobites. Other cephalopods exceed a length of one metre. Cephalopods such as the octopus and squid have a siphon called the hyponomethat they use to expel a jet of water to propel themselves. answer choices They are protostome acoelomates They are protostome coelomates Mollusks have a unique larval form called a trochophore. What Mollusk group does the picture belong to? Most mollusks have a distinct head region. ; Daz Agras, G.J. Mollusks also have a coelom, a complete digestive system, and specialized organs for. Despite their name, cuttlefish are not fish but mollusks. Overall, the members of phylum Mollusca are far more sophisticated and complex than they may outwardly appear. The visceral mass contains the digestive, excretory, and reproductive . The words mollusc and mollusk are both derived from the French mollusque, which originated from the Latin molluscus, from mollis, soft. Notes/Highlights. Many gastropod species, for example, are necessary intermediate hosts for parasitic flatworms (class Trematoda, phylum Platyhelminthes), such as the species that cause schistosomiasis in humans. Create your account, 31 chapters | The four important body parts in the mollusk could be listed as: Shell, Mantle, Visceral Mass and Foot.