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Cnidarians. (Coelenterates). Phylum Cnidaria (Coelenterata). Class Hydrozoa = Hydra POLYP body form = “vase shaped” ; sessile Most live in colonies. 1 of 3 classes within Phylum Cnidaria. Phylum Cnidaria (Coelenterata). Class Scyphozoa: “Cup Animals”

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Cnidarians

(Coelenterates)


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Phylum Cnidaria (Coelenterata)

  • Class Hydrozoa = Hydra

  • POLYP body form = “vase shaped” ; sessile

  • Most live in colonies.

1 of 3 classes within Phylum Cnidaria


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Phylum Cnidaria (Coelenterata)

  • Class Scyphozoa: “Cup Animals”

    • Medusa body form (bell-shaped); swimming

    • Commonly known as jellyfish

    • “Portuguese Man-o-war”

    • 200 different species


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Phylum Cnidaria (Coelenterata)

  • Class Anthozoa: “Flower Animals”

    • 6,100 different species

    • Sea Anemones, Corals

    • Coral Reef = 30 degrees North or South of the equator, shallow water for photosynthetic algae that live in symbiosis with coral


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Classification

  • Common Name: Hydra

  • Scientific Name: Hydra

  • Phylum: Cnidaria

  • Class: Hydrozoa

  • Other: Phylum Coelenterata (Old name)


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Major Characteristics

  • Body Plan: Hollow, 2 layered sac

  • Body Cavity: Endoderm, Mesoglea (jelly like), Ectoderm

  • Symmetry: Radial - pull in food from all around

  • Cell Specialization: No Organs, Nematocysts = harpoon likestinging cells; neurotoxins cause paralysis


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Life Support Processes

  • Absorption: Gastroderm; directly into the body wall

  • Feeding: tentacles pull food into the mouth; they are carnivores

  • Digestion: Gastroderm (endoderm), food vacuoles in cells

  • Respiration & Circulation: Gastrovascular inner cavity


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Life Support Processes

  • Excretion: Mouth opening, diffusion

  • Secretion: sticky base for attachment

  • Response: Nerve Net - contractile fibers in the epidermis; Ocelli - detects light

  • Movement: contractile fibers; tumble motion through the water

  • Reproduction: Asexual = budding; sexual = hermaphrodite (no self fertilization)


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Life Support Processes

  • Support: tissue layers, hydroskeleton


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Ecological Relationships

  • Freshwater living

  • Solitary - not colonial like most hydrozoans

  • Carnivorous - predatory lifestyle


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Body Systems Compared With Humans

  • Tissues - layers like our skin


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Advancements Over the Previous Phylum

  • Nervous Structure

  • Movement

  • Active Feeding



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Noteworthy Cnidarians!

  • The largest jellyfish is the Arctic Giant Jellyfish: it can have a diameter over 8 ft. with tentacles stretching as long as 120 ft.

  • The most venomous jellyfish is the Australian Sea Wasp; death can occur within 1-3 minutes.

  • The Great Barrier Reef is the worlds largest stony coral structure stretching for 1,260 miles off Northeast Australia.



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Preventing beach erosion

Coral Reefs can be visible from the air!