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Phyla Cnidaria and Ctenophora. Radial or biradial symmetry. Contents. Phylum Cnidaria Unique characteristics Systems 1 (Integumentary, skeletal, muscle and digestive) 2 (Excretory, respiratory, circulatory and nervous) 3 (Endocrine and reproductive) Taxonomy Phylum Ctenophora

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phyla cnidaria and ctenophora

Phyla Cnidaria and Ctenophora

Radial or biradial symmetry

contents
Contents
  • Phylum Cnidaria
    • Unique characteristics
    • Systems
      • 1 (Integumentary, skeletal, muscle and digestive)
      • 2 (Excretory, respiratory, circulatory and nervous)
      • 3 (Endocrine and reproductive)
    • Taxonomy
  • Phylum Ctenophora
    • Unique characteristics
    • Comparison to Cnidaria
    • Taxonomy
phylum cnidaria
Phylum Cnidaria
  • Some unique characteristics
    • Nematocysts
    • Alternation of generations
      • (polyp and medusa body forms)
    • Planula larva
    • Mesoglea
cnidaria systems 1
Cnidaria Systems 1
  • Integumentary
    • One cell layer (epidermis)
  • Skeletal
    • Hydrostatic or some with endoskeletons and/or exoskeleton of calcium carbonate (Anthozoa)
  • Muscle
    • None; epith-muscle cells (fibers from cells into mesoglea) Anthozoa may have muscles
  • Digestive
    • Incomplete
cnidaria systems 2
Cnidaria Systems 2
  • Excretory
    • Isotonic in marine; some freshwater forms use contractile vacuoles)
  • Respiratory
    • No system , use cellular diffusion
  • Circulatory
    • No system, use cellular diffusion and mesoglea
  • Nervous
    • Nerve net (ring around the bell of medusa)
cnidaria systems 3
Cnidaria Systems 3
  • Endocrine
    • Have hormones, secreted by nervous system
  • Reproductive
    • Alternation of generations, vary as to dominant stage
      • Medusa is the sexual body plan
      • Polyp is the asexual body plan
    • Planula larva
    • Dioecious or monoecious
cnidaria taxonomy
Class Hydrozoa (hi-dro-zo-ah)

Hydra,

Obelia,

Gonionemus,

Physalia

Class Scyphozoa (sky-fo-zo-ah)

Aurelia

Class Anthozoa (an-tho-zo-ah)

Metridium

Tubipora

Gorgonia

Other anthozoan coral

Class Cubozoa (ku-bo-zo-ah)

No specimens

Cnidaria Taxonomy
class hydrozoa
Class Hydrozoa
  • Alternation of generation with polyp as the dominant body plan
  • Incomplete digestive with an unbranched gut.
  • Mesoglea thin
  • Medusa with a velum
class scyphozoa
Class Scyphozoa
  • Alternation of generation with medusa the dominant body plan
  • Incomplete digestive with four branches
  • Mesoglea thick with some cells
  • Medusa without velum
class anthozoa
Class Anthozoa
  • No alternation of generation - polyps only
  • Incomplete digestive with 6 to 8 branches (septia)
  • Nematocyst in the gut (acontia)
  • Mesoglea thick and with muscle tissue
  • Coral Reefs
other anthozoan coral

Fungia

Astrangia

Brain coral

Lettuce coral

Sea pansy

Other Anthozoan Coral
coral reefs
Coral Reefs
  • Fringing reef
    • Close to land mass none or a narrow lagoon between land and shore.
  • Barrier reef
    • Has a wide and deep lagoon between reef and shore line.
  • Atolls
    • Reefs that encircle a lagoon, but there is no island
phylum ctenophora
Phylum Ctenophora
  • Unique Characteristics
    • Comb plates
    • Medusa only
    • Luminescence common
    • Position of paired tentacles changes symmetry to biradial
comparison ctenophora to ctenophora
Differences

No alternation of generations (medusa only)

No nematocysts

Biradial symmetry, two tentacles

Combs

Complete digestive system

May be triploblastin

Similarities

Aboral-oral axis

Nerve net

Lack of organ systems

Comparison Ctenophora to Ctenophora
taxonomy phylum ctenophora
Taxonomy Phylum Ctenophora
  • Class Tentaculata (ten-tack-u-la-ta)
    • Pleurobrachia