8_Invertebrates - 1 The Evolution of Invertebrates 2006: D....

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Unformatted text preview: 1 The Evolution of Invertebrates 2006: D. Julian Home Page The family tree of eukaryotes Figure 28.4 2006: D. Julian Which is most closely related to humans? 2006: D. Julian 2 A choanoflagellate colony The animal kingdom probably evolved from a colonial, flagellated choanoflagellate that lived over 700 million years ago. Figure 32.3 2006: D. Julian The origin of animals? 2006: D. Julian Phylogeny based on body-plans The traditional way of determining evolutionary relationships between animals is by their body plans: how the anatomy is similar and how it is different among animals. In this system, there are four major branches (grades). 2006: D. Julian 3 Parazoa No true tissues Includes the Porifera, which are the sponges. 2006: D. Julian Porifera (sponges) 2006: D. Julian Porifera (sponges) 2006: D. Julian 4 Early development of specialized tissues 2006: D. Julian Early development of specialized tissues 2006: D. Julian Eumetazoa True tissues Basically everything except sponges....
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8_Invertebrates - 1 The Evolution of Invertebrates 2006: D....

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