You understand that these calls may be generated using an automated technology. Mollusks and Annelids - Introductory Biology: Evolutionary and Scallops are different. Physical Traits: They have two shells connected by a hinge called the ligament, and kept closed by powerful muscles. Locomotion in cephalopods is facilitated by ejecting a stream of water for propulsion (jet propulsion). Animals in the class Polyplacophora (bearing many plates) are commonly known as chitons and bear an armor-like, eight-plated shell (Figure 2). This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. 1. Members of a species mate, then the female lays the eggs in a secluded and protected niche. Title: Subtitle: Section of Page if appropriate. Use the information in your Venn diagram to help you . Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. Study now. When citing a WEBSITE the general format is as follows. Annelids have a closed circulatory system with muscular pumping hearts in the anterior segments, dorsal and ventral blood vessels that run the length of the body with connections in each segment, and capillaries that service individual tissues. Use a type of jet propulsion for movement. What are the differences between the protection characteristics of bivalves, gastropods, and cephalopods? While on the other hand Mussels and Oysters attach themselves with a strong thread or cement to solid surfaces. Gills are thin filaments that absorb gases and exchange them between the blood and surrounding water. Diet: They are predators, using their arms (or tentacles) to trap prey, and a sharp beak to bite prey. To help students learn the anatomy of the Mollusks, print out a black and white version of the color following diagrams: Assess content comprehension about Mollusks (Octopus, Squid, Snails, Clams, etc.) These are joined together along one edge by a flexible ligament that, in conjunction with interlocking teeth on each of the valves, forms the hinge. Some bivalves like oysters and mussels have the unique ability to secrete and deposit a calcareous nacre or mother of pearl around foreign particles that enter the mantle cavity. Mollusks have a circulatory system with one or two hearts that pump blood. They have gills that are bathed with fresh water (and oxygen) through posterior siphons. They have no head, but a diffuse nerve network made up of three nerve centers (or ganglia) distributed around their visceral mass.
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