phylum cnidaria - aghamazing guro03/02/2017 1 phylum cnidaria danilo v. rogayan jr. faculty, college...
TRANSCRIPT
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Phylum
Cnidaria
Danilo V. Rogayan Jr.Faculty, College of Education, Arts and Sciences
Ramon Magsaysay Technological University
PHYLUM CNIDARIAJellyfish, sea anemones, corals
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Phylum Cnidaria
• Some unique characteristics
• Nematocysts
• Alternation of generations
• (polyp and medusa body forms)
• Planula larva
• Mesoglea
Sea anemones
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Members of this phylum have tentacleswith stinging cells.
Cnidaria Systems
• 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
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Cnidaria Systems
• 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
• 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
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Cnidarians can have one of two body shapes: an umbrella-shaped medusa form, like the jellyfish on the left, or a vase-shaped polyp form, like the sea anemone on the right.
Freshwater Hydra Comb Jellies
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Coral reefs contain many members of Phylum Cnidaria.
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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
Class Hydrozoa
• Alternation of generation with polyp as the dominant body plan
• Incomplete digestive with an unbranched gut.
• Mesoglea thin
• Medusa with a velum
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Class HydrozoaGenus— Hydra
CS through hydra
Class HydrozoaGenus— Obelia
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Class HydrozoaGenus— Gonionemus
Class HydrozoaGenus— Physalia
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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 ScyphozoaGenus— Aurelia
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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
Class AnthozoaGenus — Metridium
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Class AnthozoaGenus — Tubipora
Class AnthozoaGenus — Gorgonia
Sea fan
String coral
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Other Anthozoan Coral
AstrangiaFungia
Sea pansyLettuce coral
Brain coral
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
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