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Bio February 1 - Bio February 1 Which is not a defining...

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Bio February 1  Which is not a defining characteristic of animals? Multicelled organelles Wednesday Lec. o Phylogeny of Animals Metazoans – Common ancestor = sponge-like protist called  a choanoflagellate Characteristics to build a phylogeny of animals Symmetry o Asymmetric: sponges o Radial: Jellyfish, sea anemones o Bilateral: All others Tissues o Absent: sponges o Present: all other animals (“Eumetazoans”) o Triploblastic: have all 3 types of tissues o Diploblastic: have 2 types of tissues Body Cavities o Acoelomate: no body cavity o Pseudocoelomate: body cavity simpler o Coelomate: entire body cavity o Function? Acts as a buffer, protects internal  organs. Some animals use it as a hydrostatic  skeleton. o Convergent evolution? May have evolved  multiple times Embryonic Development o How to tell protostomes and deuterostomes  apart?
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