WARM UP Why are animals (and other organisms) classified into similar groups? What are two of the characteristics used to classify animals?

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Presentation transcript:

WARM UP Why are animals (and other organisms) classified into similar groups? What are two of the characteristics used to classify animals?

Animal Phylogeny

Phylogeny An “tree of life” Based on evolutionary connections

Phylogeny Classification by similar characteristics

Phylogeny Ancestral characteristics shared by distant ancestors Derived characteristics that are new in a group

Clades No Tissues Porifera Tissues All other phyla

Clades Radial Symmetry Cnidaria Bilateral symmetry All others*

Clades Acoelomates Pseudocoelomates Coelomates Platyhelminthes Nematoda Coelomates All others

Clades Protostomes Deuterostomes Mouth first, coelom from outside space Mollusca, Annelida, Arthropoda Deuterostomes Mouth second, coelom from gut wall Echinodermata and Chordata

WRAP UP List the key adaptations or characters that identify the phylum Echinodermata.

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