Lecture_2_-_Cnidarians_2008_-_4_slides - Cnidarians...

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1 Cnidarians Lecture 2 May 19, 2008 Professor Hofmann Mr . Ray's Classroom Cnidarians: Ecosystem engineers! UCSB Moorea Coral Reef Long-term Ecological Research Outline for Lecture 2 Intro to Phylum Cnidaria – The members of the group – Evolutionary relationships – Distinguishing characteristics Functional information – Nematocysts – Feeding – Symbiosis in cnidarians Examples of diversity Phylum Ctenophora Calcareous sponges Glass sponges Demosponges Bilaterians (protostomes and deuterostomes) Cnidarians Ctenophores
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2 Who are they? Phylum Cnidaria contains about 10,000 species – Jellyfish – Sea anemones – Corals – Hydrozoans Polyorchis penicillatus Anthopleura elegantissima Ptilosarcus gurneyi Phyllorhyza punctata All cnidarians have… A basic radial symmetry Only 2 layers of living tissue Epidermis and gastrodermis A middle gelatinous layer – the mesoglea – in between the 2 living layers of tissue Tentacles surrounding the mouth Only a single opening to the digestive system – “ blind gut these crazy things called nematocysts that account for the “stinging” activity that is associated with these animals Lion’s Mane Jelly Cyanea capillata
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