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An Overview of Invertebrate Evolution: Gastropods, Bivalves, and Cephalopods

This lecture explores the fascinating world of invertebrate evolution, focusing on three major groups: Gastropods, Bivalves, and Cephalopods. Gastropods represent the largest and most diverse class of mollusks, featuring snails and slugs, often characterized by their spirally coiled shells. Bivalves, including clams, scallops, oysters, and mussels, are known for their two-valved shells. Cephalopods, such as squid, giant squids, and octopuses, showcase remarkable intelligence and adaptability, making them the most complex invertebrates with notable memory and learning abilities.

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An Overview of Invertebrate Evolution: Gastropods, Bivalves, and Cephalopods

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. Gastropods: • largest of class, most diverse • include snails & slugs. • foot spreads while crawling. • many species spirally coiled/conical shells. • Chitons: • slow-moving/sedentary grazers.

  3. Bivalves: • two-valved shell. • include clams, scallops, oysters & mussels. • Cephalopods • highly active predators of the sea. • include swiftest (squid), largest invertebrates (giant squid) & the smartest (octopuses). • have some memory power & capacity to learn thus most complex invertebrates.

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