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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

Cnidarians

(Coelenterates)

phylum cnidaria coelenterata
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 coelenterata3
Phylum Cnidaria (Coelenterata)
  • Class Scyphozoa: “Cup Animals”
    • Medusa body form (bell-shaped); swimming
    • Commonly known as jellyfish
    • “Portuguese Man-o-war”
    • 200 different species
phylum cnidaria coelenterata5
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
classification
Classification
  • Common Name: Hydra
  • Scientific Name: Hydra
  • Phylum: Cnidaria
  • Class: Hydrozoa
  • Other: Phylum Coelenterata (Old name)
major characteristics
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
life support processes
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
life support processes11
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)
life support processes14
Life Support Processes
  • Support: tissue layers, hydroskeleton
ecological relationships
Ecological Relationships
  • Freshwater living
  • Solitary - not colonial like most hydrozoans
  • Carnivorous - predatory lifestyle
body systems compared with humans
Body Systems Compared With Humans
  • Tissues - layers like our skin
advancements over the previous phylum
Advancements Over the Previous Phylum
  • Nervous Structure
  • Movement
  • Active Feeding
slide19

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.
slide21

Preventing beach erosion

Coral Reefs can be visible from the air!