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Phylum Cnidaria : More than Just Jellyfish

Phylum Cnidaria : More than Just Jellyfish. Don’t Forget Sponges!. Phylum: Porifera Anatomy & Physiology: Osculum , Spongocoel ( asymetrical ) Archaeocytes , choanocytes , spicules Ecology: Filter feeders. Cnidarians have Cnidocytes.

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Phylum Cnidaria : More than Just Jellyfish

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  1. Phylum Cnidaria: More than Just Jellyfish

  2. Don’t Forget Sponges! • Phylum: • Porifera • Anatomy & Physiology: • Osculum, Spongocoel (asymetrical) • Archaeocytes, choanocytes, spicules • Ecology: • Filter feeders

  3. Cnidarians have Cnidocytes • Cnidocytes are stinging cells that produce toxins and inject it into prey. • They are used to stun and capture prey. Cnidocyte

  4. Two Major Groups of Cnidarians Anthozoa Medusozoa Box jellies Sea anemones True jellies Sea Pens hydrozoa Corals

  5. Cnidarian Life Cycle • Two main phases: • Polyp (stationary) • Medusa (mobile) • Some Cnidarian species have only a single phase. This is a general description.

  6. Cnidarian Anatomy

  7. Cnidarian Anatomy

  8. Sea Anemones • Anemones spend most of their time attached to rock or coral, though they can move. • They are predators

  9. Clownfish & Anemone • One of the best examples of symbiosis in all of biology • What does each organism get from the other?

  10. Corals • Brain coral shown at left • Corals are colonies of many tiny polyps.

  11. They are carnivores. • They have no medusa stage in their life cycle – all polyp Flower Coral

  12. Coral Reefs • Corals CaCO3 holdfasts are what coral reefs are made of.

  13. Sea Pens & Sea Fans: “Soft” Corals – No CaCO3 “bones”

  14. Box Jellyfish: Deadliest Venom? • Cnidocytes on the tentacles of box jellies may have killed more people than any other venom!

  15. True Jellies: Scyphozoa

  16. Hydrozoa: Weird Misfit Cnidarians Deadly Portugese-Man-O-War • Many sizes and shapes • Many variations on life cycle • Poorly defined group Hydra

  17. In Summary • Cnidarians have stinging cells called cnidocytes. • The Cnidarian life cycle includes polyp and medusa stages. • Cnidaria includes a wide variety of species, including jellifish, anemones, and hard and soft corals. • They are all predators.

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