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Lecture 19

Lecture 19 - Survey of Invertebrates

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Earth Sciences
Earth Sciences 1083F/G
Cameron Tsujita

Lecture 19Survey of Invertebrates y How do you make a metazoan o Starts with a single protista eg amoebas y Phylum Protista o Importance of chaonoflagellatesProtists with a collared cells and a flagellum for movementSome chaonoflagellates form colonies all members of the colonies move their flagella to generate a current to extract food y Phylum Porifera Sponges o Single layer of tissue with collared cells o A larger integrated structure supported by rigid spicules or organic tissue o Differentiation of cells required the evolution of Hox Genes o Similar to some Ediacaran animals o Show fractal organization y Phylum CnidariaCoelenterata o Second major body of metazoan body plan o 2 layers of tissue endoderm and ectoderm o Probably resulted from folding in of ectoderm o Eg jellyfish coral y Bilaterans o Most complex met
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