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Lecture 5 Animal Evolution – The Invertebrates

Lecture 5 Animal Evolution – The Invertebrates. Gastropods: largest of class, most diverse include snails & slugs. foot spreads while crawling. many species spirally coiled/conical shells. Chitons: slow-moving/ sedentary grazers. Bivalves: two-valved shell.

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Lecture 5 Animal Evolution – The Invertebrates

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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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