4. Cnidaria I - Phylum Cnidaria Phylum Cnidaria corals,...

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1 Phylum Phylum Cnidaria Cnidaria corals, jellyfish, anemones, hydrozoans corals, jellyfish, anemones, hydrozoans All aquatic All aquatic ~ 10,000 living species (~ 5000 fossil sp.) ~ 10,000 living species (~ 5000 fossil sp.) Tissue Grade Tissue Grade Diploblastic Diploblastic Important systems for : Important systems for : Symbiosis Symbiosis Immunology (self Immunology (self -non non self recognition) self recognition) Coral Reefs! Corals and their Corals and their allies - form form most diverse communities most diverse communities in the sea, and perhaps on Earth on Earth Create habitat for a huge diversity of species diversity of species PHYLUM CNIDARIA all members possess CNIDAE includes jellyfish, anemones, corals ancient group – Precambrian ~ 11,000 living species, ~5,000 fossil sp. - present classes date to Ordovician Received Attention: 1) Beginnings of tissues, primitive nervous system 2) Primary Reef Builders 3) Important primary carnivores 4) Rich in natural products chemistry, Bioluminescence 5) Self Non-Self interactions
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2 Cnidaria are at a Tissue Grade cells aggregated into differentiated tissues Two basic types of construction: POLYPS MEDUSAE Benthic or Pelagic Many are colonial body types – building blocks for colonial construction. Two Cell Layers Two Cell Layers - Epidermis & Epidermis & Gastrodermis Gastrodermis Acellular Acellular Mesoglea in between Common features: - Old name – COELENTERATA
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This note was uploaded on 01/27/2010 for the course BIO 37282 taught by Professor Padilla during the Fall '10 term at SUNY Stony Brook.

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4. Cnidaria I - Phylum Cnidaria Phylum Cnidaria corals,...

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