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Kingdom Animalia. Embryonic development. Types of Symmetry. Phylum Porifera “Pore Bearers”. Cnidaria “ Stinging Creatures ”. Coelm: body cavity Fluid filled space in multicellular animals. Coelomate animals: true cavity: with a complete lining called peritoneum derived from mesoderm
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Coelm: body cavityFluid filled space in multicellular animals • Coelomate animals: true cavity: with a complete lining called peritoneum derived from mesoderm • Pseudocoelomate animals have a pseudocoel: • “false cavity” • tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals. • All pseudocoelomates are protosomes • Acoelomate animals, like flatworms, have no body cavity at all. Organs have direct contact with the epithelium.
Mollusca “The Mollusks”