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Lecture 5 Animal Evolution – The Invertebrates

Lecture 5 Animal Evolution – The Invertebrates. 6 important adaptations that contributed to the success of arthropods:. hardened exoskeleton joint appendages highly modified & specialized segments respiratory structures specialized sensory structures specialized developmental stages.

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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. 6 important adaptations that contributed to the success of arthropods: • hardened exoskeleton • joint appendages • highly modified & specialized segments • respiratory structures • specialized sensory structures • specialized developmental stages.

  3. i. Hardened exoskeleton • cuticle made of chitin, proteins & waxes with calcium carbonate deposits. • Cuticle; a protective external skeleton (exoskeleton). • cuticle could have evolved to escape predation. • waxy surface limits water loss. • hard cuticles restrict size increases; arthropods grow in spurts by molting.

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