Life 103 Week 9
Life 103 Week 9 LIFE 103
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This 1 page Class Notes was uploaded by Caroline Hurlbut on Friday March 25, 2016. The Class Notes belongs to LIFE 103 at Colorado State University taught by Jennifer L Neuwald; Tanya Anne Dewey in Fall 2016. Since its upload, it has received 20 views. For similar materials see Biology of Organisms-Animals and Plants in Biology at Colorado State University.
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Date Created: 03/25/16
Animal Diversity & Evolution • taxon - refers to any level or entity of classiﬁcation (ex. species, phylum, genus, etc.) • clade - refers to a monophyletic group • animals are metazoans • 70% of all animals are insects • Cambrian explosion of animal phyla —nearly all animals evolved during this time period • characteristics of animals —multicellular —specialized cells (nerve and muscle) —ingestive heterotrophs —move under own volition at some point in life • true animals have true tissues and are eumetazoans • themes in animal evolution —origin of multicellularity A. choanoﬂagellates are unicellular sister group to animals —origin of bilateral symmetry, cephalization, and the nervous system —origin of embryonic tissue layers A. diploblastic: 2 tissue layers B. triploblastic: 3 tissue layers —origin of coelom (ﬂuid ﬁlled cavity) A. acoelomate: no coelom B. coelomate: true coelom C. pseudocoelomate: coelom not only in mesoderm —protostome vs deuterostome development A. protosome development is spiral and determinate B. deuterostome development is radial and indeterminate C. ﬁrst hole formed in protostomes develops into mouth D. ﬁrst hole formed in deuterostomes develops into anus —origin of segmentation A. allows for specialization of certain parts