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Lesson #17: Mollusks

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chris desmond

on 26 June 2013

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Transcript of Lesson #17: Mollusks

Mollusks Whelk Anatomy Vocabulary Siphon Proboscis Tentacle Foot Operculum A siphon is a long tube-like structure that is present in certain aquatic mollusks (Gastropods, bivalves, and cephalopods).
The tube is used for the exchange of liquids, or air. It can have different purposes, the most common are breathing, locomotion, and feeding. The proboscis is located on the head and acts as a mouth for the animal. It's elongated and used as a suction device to ingest liquid food. The foot is used for movement and also helps attach the animal to things such as the ground or rocks. Tentacle is an elongated flexible extension, as one of those surrounding the mouth of a mollusk, used for feeling, grasping, or locomotion. Gastropod A class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes. Bivalve Marine or freshwater mollusks having a soft body with plate-like gills enclosed within TWO shells hinged together Cephalopod Marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles An operculum is a small covering or lid. Mollusks include...
Gastropods
Bivalves
Cephalopods Example: Clams, oysters, mussels Example: Whelks and Conchs Example: Squid and Octopus
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