Phylum cnidaria more than just jellyfish
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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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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

  • Cnidocytes are stinging cells that produce toxins and inject it into prey.

  • They are used to stun and capture prey.

Cnidocyte


Two Major Groups of Cnidarians

Anthozoa

Medusozoa

Box jellies

Sea anemones

True jellies

Sea Pens

hydrozoa

Corals


Cnidarian Life Cycle

  • Two main phases:

    • Polyp (stationary)

    • Medusa (mobile)

  • Some Cnidarian species have only a single phase. This is a general description.


Cnidarian Anatomy


Cnidarian Anatomy


Sea Anemones

  • Anemones spend most of their time attached to rock or coral, though they can move.

  • They are predators


Clownfish & Anemone

  • One of the best examples of symbiosis in all of biology

  • What does each organism get from the other?


Corals

  • Brain coral shown at left

  • Corals are colonies of many tiny polyps.


  • They are carnivores.

  • They have no medusa stage in their life cycle – all polyp

Flower

Coral


Coral Reefs

  • Corals CaCO3 holdfasts are what coral reefs are made of.


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


Box Jellyfish: Deadliest Venom?

  • Cnidocytes on the tentacles of box jellies may have killed more people than any other venom!


True Jellies: Scyphozoa


Hydrozoa: Weird Misfit Cnidarians

Deadly Portugese-Man-O-War

  • Many sizes and shapes

  • Many variations on life cycle

  • Poorly defined group

Hydra


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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