UT Arlington BIOL 3454 - Phylum Cnidaria- Invert Zoolog (19 pages)

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Differ from Scyphozoa bc 1 Square Shape 2 No strobilization instead polyps bud off 3 has a lensed eye Hydrotheca yield protection Menubrium Muscular piece associated w mouth all mostly contained w in bell Scyphozoans menubrium extends below the bell Velum Membrane under bell only in Hydrozoans 1 Gonozooids 2 Gastrozooids 3 Dactylozooids 1 Repro 2 Feeding 3 Defense 3 Orders of Hydrozoans Hydroidia Siphonophora Hydrocorillina 3 Polyp Types Gastrozooids Feeding Gonozooids Repro Dactylozooids Defense 4 Classes of Cnidaria Scyphozoa Cubozoa Anthozoa Hydrozoa Acontia have Nematocysts secretory cells extend outside body Funct Digestion Defense Adradial Canal straight line approach yields nutrients to cell All Cnidarians secrete Cnidae a nettle stinging thread Amoebocytes are similar to Archeocytes funt everything Amoebocytes Funct Digest hold move nutrients wound repair antibiotic defense Asexual Methods Strobilation Budding Bowlus wtr w in tentacles Budding Characteristics Grow new appendages then bud that Polyp Dominant equally medusa to never a medusa Solitary Benthic Complex Nerve Syst No Centralization Budding No Strobilization Nematocyst is in epidermis only and not w in Gastrodermal tissue no cells w in mesoglea Characteristics Lensed eye Rhopalia 4 tentacles s 90 Square shape Nemotocysts vry toxic Primitive but complex No Strobilization Circular Mitochondrial DNA one cell engulf another cell simbiont Links it w Protista Other Cnidaria have linear Class Anthozoa Sea Anomone Corals Lack medusa stage Operculum Cnidocil Circular Mitochondrial DNA Links it w Protista Most Dioescious Carnivores Nematocysts tentacles grab move Class Cubozoa Sea Wasps More advanced than Scyphozoa Class Hydrozoans incl Hydrocorillina Hydra Obelia Paneria etc Classify Multicellular Diploblastic Usually Radially symmetrical Tissue level of organization Cnidae Funct Defense Mechanism Collect food Locomotion kinda Cnidae may wrap around small obj s stick penetrate surfaces w toxins Cnidarian