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Radiate Phyla II

Radiate Phyla II. Chapter 7. Class Cubozoa: Sea wasps and box jellyfish About 3 dozen species almost all are tropical. medusa & polyp body forms thick mesoglea. Unfrilled bell margin drawn inward to form a velum-like structure. Cubozoan Sensory Structures.

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Radiate Phyla II

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  1. Radiate Phyla II Chapter 7

  2. Class Cubozoa: Sea wasps and box jellyfishAbout 3 dozen species almost all are tropical. medusa & polyp body forms thick mesoglea

  3. Unfrilled bell margin drawn inward to form a velum-like structure.

  4. Cubozoan Sensory Structures Sensory structures called rhopalia.

  5. Cubozoan Sensory Structures cubozoans have eyes. The larger regions actually contain lenses, corneas, and retinas.

  6. Nematocysts are concentrated in rings on the tentacles of cubozoans.

  7. Predominantly two species responsible • The Box Jelly Chironex fleckeri • Irukandji Carukia barnesi

  8. The Box Jelly Chironex fleckeri

  9. The Box Jelly Chironex fleckeri

  10. Box Jelly Chironex fleckeri • Box jellies or sea wasps are thought to be responsible for about 65-100 deaths over the past 50 years in Australia. • The tentacles can be up to 10 feet long. • In Australia twice as many people die annually from box jellies as from sharks. • The toxin of most cubomedusan jellies is more potent than cobra venom.

  11. Irukandji Carukia barnesi Stings have been recorded from Australia, and a similar syndrome has been described elsewhere in the Pacific. Every summer, more than sixty people are hospitalized with this potentially fatal syndrome.

  12. Cubozoan Life Cycle • Similar to jellyfish.

  13. Class Anthozoa • polyp body form ONLY • all marine

  14. Class Anthozoa • some are colonial •  colonies are formed of individual zooids • some are solitary

  15. Class Anthozoa- life cycle Sexual reproduction sperm egg larva

  16. Class Anthozoa- life cycle asexual reproduction fission pedal laceration fission

  17. Class Anthozoa Sea anemones

  18. Sea pansy Class Anthozoa Soft Corals Sea pen

  19. Class Anthozoa Stony Corals

  20. The Corals • Make up the largest group of Anthozoa • Colonial • Secrete skeleton of calcium carbonate • Cup shaped • Polyp is fixed to this

  21. Theca Sclerosepta

  22. Ctenophorescomb jellies • Solitary • All marine • Sexual reproduction

  23. Ctenes of comb row

  24. Feeding • Feed with specialized cells called colloblasts or lasso cells. • A few species have cnidocytes.

  25. Colloblasts on ctenophore tentacles

  26. colloblasts

  27. Kleptocnidae

  28. Ph. Ctenophora Cl. Nuda ctene row Deiopea kaloktenota Cl. Tentaculata Pleurobrachia sp. Coeloplana sp. Cestus sp.

  29. Bioluminescence • Produce light using photocytes • Located in the walls of the digestive system • Appears that light is coming from comb rows • NOT all produce luminescence

  30. Big Picture • The radiate phyla are the first (i.e. basal) Metazoans • Most have a dimorphic life cycle • Specialized structures the Cnidocytes • Some such as corals secrete a calcium carbonate base • Ctenophores produce bioluminescence

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