Sponges - Sponges Are sponges animals or plants? They have...

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Sponges
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• Are sponges animals or plants? – They have motile larvae but as adults they cannot move (like plants). – Molecular biology (the use of 16srRNA) have become the tool for solving this classification dilema.
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Invertebrate Phylogeny • Two Approaches – Traditional reconstructions are based on key aspects of body architecture. • lumping phyla that share fundamental aspects of body plan – New reconstructions employ molecular comparisons. • focus on differences in ribosomal RNA sequences
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Traditional Protostome Phylogeny
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Novel rRNA Protostome Phylogenies • Lophotrochozoans: – additional growth by adding mass to an existing body. – Most are aquatic and propel by cilia – Many have a free living larvae called trochophore • Flatworms- no enclosed body cavity organs for transportation of oxygen inside the body. • Mollusk-unsegmented coelomates • Annelids-segmented coelomates
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Ecdysozoans Molting animals. Increase their size by molting their
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This note was uploaded on 08/03/2010 for the course BIO 1500 taught by Professor Pandolfi during the Fall '08 term at Wayne State University.

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Sponges - Sponges Are sponges animals or plants? They have...

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