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Phylum Cnidaria. Cnidarians Include Hydras, jellyfish, sea anemones & corals Radially symmetrical Acoelomate Two basic forms: Polyp : Cylindrical form which attach bases to substratum Medusa : Flattened, mouth down version of the polyp. Moves freely. Forms of Cnidarians. Body Plan.

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phylum cnidaria

Phylum Cnidaria

Cnidarians Include Hydras, jellyfish, sea anemones & corals

Radially symmetrical

Acoelomate

Two basic forms:

Polyp: Cylindrical form which attach bases to substratum

Medusa: Flattened, mouth down version of the polyp. Moves freely

body plan
Body Plan
  • Basic Body Plan:
  • Has an outer epidermis
  • Has an inner gastrodermis which forms a gastrovascular cavity
  • Has a middle "jelly filled" layer called mesoglea
cnidocytes
Cnidocytes
  • Cnidarians are predators which have tentacles possessing batteries of special cells called Cnidocytes
  • Cnidocytes contain special stining capsules called nematocysts.
  • When triggered, these cells shoot out a discharge thread which can entangle and/or poison it's intended prey
slide6
Reproduction
    • Reproduction can occur sexually by fertilization of egg and sperm forming larvae.
    • Reproduction can also occur asexually through budding
  • 3 Major classes
    • Class Hydrozoa: Hydras
    • Class Scyphozoa: Jellyfish
    • Class Anthozoa: Anemones and corals
class hydrozoa the hydras
Class Hydrozoa: The Hydras
  • Polyp phase is dominant
  • Generally microscopic
  • Generally freshwater
class scyphozoa the jellies
Class Scyphozoa: The Jellies
  • Generally refered tro as jellies
  • Medusa stage is dominant
  • Come in a variety of forms
  • Aggressive predators, and can be dangerous to humans

Jelly

Portugese

Man-o-war

class anthozoa anemones corals
Class Anthozoa: Anemones & Corals
  • Appear like plants but are animals.
  • Polyp form is dominant.
  • Corals build calcium shells to protect themselves
    • Have symbiotic relationship with algae.
  • Can build extensive masses which can form land masses.

Anemone

Coral Polyps

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Coral Reefs

Clownfish living in

An anemone