The early evolution of animals
The early evolution of animals
The early evolution of animals
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What are the <strong>animals</strong>?<br />
SUMMARY<br />
• Animalia includes sponges plus Eumetazoa<br />
• Radiata are ctenophores and corals<br />
• Most animal phyla fall into Bilateria<br />
subdivided into Deuterostomes and<br />
Protostomes<br />
• Animal body plans vary in number <strong>of</strong> tissues<br />
layers and presence/absence <strong>of</strong> celom –<br />
Parazoan, Diploblastic, Triploblastic<br />
• Fossils should be considered using the stem<br />
and crown group concept
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