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Life 103- Animals week 1

by: Alexis Darling

Life 103- Animals week 1 LIFE 103

Marketplace > Colorado State University > Biology > LIFE 103 > Life 103 Animals week 1
Alexis Darling
GPA 4.0

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About this Document

The general characteristics and themes in evolution of all animals.
Biology of Organisms-Animals and Plants
Jennifer L Neuwald; Tanya Anne Dewey
Class Notes
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This 1 page Class Notes was uploaded by Alexis Darling on Monday March 28, 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 11 views. For similar materials see Biology of Organisms-Animals and Plants in Biology at Colorado State University.


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Date Created: 03/28/16
~Ediacaran Origin­ when animals evolved  ~Cambrian explosion­ time where nearly all animal diversity came from    All animals are:  ● Multicellular  ● Motile at some stage in life  ● Have unique, specialized cells (nerve and muscle)­ with exceptions  ● Ingestive heterotrophs (take in matter to digest)    Themes in Animal Evolution­ (points of diversion) chronologically  1. Multicellularity     *Choanoflagellates are the unicellular sister group to animals  2. Bilateral symmetry/cephalization  ● If bilaterally symmetrical, there is a head (cephalization)­ place where sensory apparatus  and nervous system is concentrated; purpose to better direct movement  3. Embryonic tissue layers  ★ Diploblastic­ 2 tissue layers  ★ Triploblastic­ 3 tissue layers  4. Coelom         =body cavity with fluid to allow nutrient movement         *Only in triploblastic     Three body plans:  ● Acoelomate­ no coelom; region between digestive cavity and body covering is  tissue­filled  ● Coelomate­ true coelom completely surrounded by mesoderm  ● Pseudocoelomate­ fake coelom; fluid­filled cavity between digestive tract and body  covering (endoderm and mesoderm)  5. Development of stoma (openings)  ★ Protostome­ mouth forms first  ★ Deuterostome­ mouth forms second (first is the anus)  6. Segmentation        Benefit: permits specialization of parts for specific functions 


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