... Squid. Gills extract oxygen from the water. Bivalves have two shells that are hinged on one side, allowing them to open and close. CLASS BIVALVIA. A cephalopod with 8 arms. 8 months ago. Tusk shells, also known as scaphopods, have long, cylindrical shells with tentacles extending from one end, which these mollusks use to rope in prey from the surrounding water. There is a layer of tissue called the mantle between the shell and the body. Tags: Question 5 . An extinct cephalopod with an extensive fossil record. SURVEY . Cephalopoda. Some examples of bivalves are oysters, clams, mussels, and scallops. valvia = shell : These mollusks have two shells hinged together by a ligament. Mollusca QUIZ DRAFT. The valves are connected to one another at a hinge. • The smallest bivalves are microscopic and the largest are 4 feet across. Save. Mollusks have a hard outer shell. This class of mollusks is considered to be the most intelligent. The two, 'bi', shells are also called valves, which is how these mollusks got their name. arthropods. Current and excurrent siphons circulate water containing food and oxygen through the bivalve. ... (seashells) includes clams oysters and scallops. Monoplacophorans are deep-sea mollusks equipped with cap-like shells. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion. andielj7508. Mollusks have been evolving in the sea for over 600 million years and there are more than 100,000 mollusks species. A mollusk with two shells. A member of the class polyplacophora (Mollusks with many shells) (6) Ammonite. 9th grade. Mollusks are members of the phylum mollusca. Mollusks that have 2 hinged shells belong to which class. The majority of mollusks live in the ocean. Edit. Bivalvia have two identical shells that are hinged together. Members of class Monoplacophora (“bearing one plate”) have a single, cap-like shell enclosing the body. The monoplacophorans were believed extinct and only known as fossils until the discovery of Neopilina galatheae in 1952. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. We can look at two subcategories to find examples of mollusks with shells. • The only class of molluscs that has two shells. Strong adductor muscles open and close the shells. Mollusks with two shells are known to the world as bivalves. Class Bivalvia • This class includes: clams, mussels, scallops, oysters, cockles, and jingle shells. Science. They were long believed to be extinct, but in 1952, zoologists discovered a handful of living species. 87% average accuracy. bi = two. gastropods. Invertebrate. bivales. cephalopods. Today, scientists have identified nearly two dozen living species. They have two hinged shells that close around the animal for protection. 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