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A Deep Dive into Invertebrate Animal Evolution and Body Plans

This lecture explores the fascinating world of invertebrates, focusing on their body plans divided into forebody and hindbody. It highlights the forebody appendages, including four pairs of legs, sensory pedipalps, and chelicerates that inject venom into prey. The hindbody is described as having the ability to spin silk threads for web-building and egg casing. Additionally, the open circulatory system of invertebrates is discussed, where blood is pumped into tissues through small openings, accompanied by the presence of Malpighian tubules for excretion.

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A Deep Dive into Invertebrate Animal Evolution and Body Plans

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Presentation Transcript

  1. Lecture 5Animal Evolution – The Invertebrates

  2. 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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