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. - PowerPoint PPT PresentationTRANSCRIPT
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 CnidariansAnthozoa Medusozoa
Sea anemones
Corals
Sea Pens
hydrozoa
True jellies
Box jellies
Cnidarian Life Cycle
• Two main phases:– Polyp (stationary)– Medusa (mobile)
• Some Cnidarian species have only a single phase. This is a general description.
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?
Box Jellyfish: Deadliest Venom?
• Cnidocytes on the tentacles of box jellies may have killed more people than any other venom!
Hydrozoa: Weird Misfit Cnidarians
• Many sizes and shapes
• Many variations on life cycle
• Poorly defined group
Deadly Portugese-Man-O-War
Hydra