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Lecture 5 Animal Evolution – The Invertebrates

Lecture 5 Animal Evolution – The Invertebrates. Spiders and Their Relatives. Sea: mites, sea spiders, horseshoe crabs Land: spiders, scorpions, ticks & chigger mites-arachnids. Spiders are beneficial-prey on large numbers of insects. Ticks-parasitize deer, mice & other invertebrates.

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Lecture 5 Animal Evolution – The Invertebrates

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. Spiders and Their Relatives • Sea: mites, sea spiders, horseshoe crabs • Land: spiders, scorpions, ticks & chigger mites-arachnids. • Spiders are beneficial-prey on large numbers of insects. • Ticks-parasitize deer, mice & other invertebrates. • Mites – smallest, most diverse, and most widely distributed.

  3. Their body plans • Divided into forebody & hindbody. • Forebody appendages: • four pair of legs, pair of pedipalps with sensory roles & a pair of chelicerate that wound/ put venom into prey. • Hindbody appendages: • spin out silk threads for webs and egg cases. • Open circulatory system-blood pumped into tissues, blood received through small openings in its wall. • Have Malphigian tubules

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