01:119:116 Lecture 5: Unikonta Diversity Animals II
25 Feb 2016
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Document Summary
Cc basic animal characteristics to other eukaryotic kingdoms (and the protists) Details the evolutionary evidence for animals as a monophyletic group. Place major animal clades and derived characteristics on a phylo tree. 1. 3 mil living species of animals have been identified. Their bodies are held together by structural proteins such as collagen. Many animals have at least one larval stage. A larva is a sexually immature and morphologically distinct from the adult; it eventually undergoes metamorphosis. Jelly fish have only two hox genes, bilateria have at least 7. Animals can be categorized according to the symmetry of their bodies of lack of it. A dorsal (top) side and a ventral (bottom) side. Animals that are diploblastic (like jellyfish) or do not form a blastula (like sponges) have no body cavity. Proto- the splitting of solid masses of mesoderm forms the coelom. Deutero-the mesoderm buds from the wall of the archenteron to form the coelom.
