Phylum Cnidaria
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Transcript of Phylum Cnidaria
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Phylum Cnidaria
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What are Cnidarians?http://www.youtube.com/watch?v=wOXO4F9
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Groups of CnidariansJellyfishes (class Scyphozoa – cup animals)Hydras (class Hydrozoa)*Sea anemones (class Anthozoa – flower
animal)*Corals (class Anthozoa – flower animal)*
*only have polyp stage of life cycle
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QuestionsWhat domain are we focusing on in this
class?What kingdom are we focusing on?What is the phylum for jellies, coral, hydras,
sea anemones?
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Characteristics of CnidariansSoft-bodiedCarnivorousHave stinging tentacles arranged in a circle
around their mouthMost simple animals with body symmetry &
specialized tissues
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QuestionWhy is it important that their tentacles are
arranged around their mouth?
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Where does the name Cnidaria come from?From their stinging cells – cnidocytesThese cells are used for defense and to
capture prey
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NematocystLocated within a cnidocyteThis is the poison filled stinging structure –
has a tightly coiled dart
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Body PlanFew cells thick and have
a simple body systemHave a central mouth
surrounded by numerous tentacles that extend outward from the body.
2 tissue layersEpidermis (outer)Mesoglea (middle goo)Gastroderm (inner)
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QuestionsWhat are the stinging cells called?What is the name of the actual poisonous dart
in the stinging cells?Why is it advantageous to be only a few cells
thick when you are a marine organism?
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SymmetryCnidarians are radially symmetrical
Like spokes on a wheel no matter how you divide it through the middle it is symmetrical
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QuestionsWhat type of symmetry do poriferans have?What type of symmetry do cnidarians have?
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Life CycleTypically have a life cycle that includes two
different-looking stages.PolypMedusa
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PolypCylindrical body with armlike tentaclesThe mouth points upward – why is this
important?Usually sessile
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MedusaMotileBell shapedMouth on bottom – why would their mouth be
on the bottom?
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Cnidarian ReproductionSexual
Typically in the medusa stageTypically have a planula larvae
AsexualTypically in the polyp stage
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Ecological Roles – Predator-PreyCnidarians are predatorsSea turtles, some fish and mollusks will feed
on jellies
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Ecological Relationships - SymbiosisMutualism
Clownfish and anemone
Hermit crabCoral and
zooxanthellae
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Phylum Ctenophora
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http://www.youtube.com/watch?v=5MKq6CvxR7w
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Differences/Similarities Between Cnidarians and CtenophoresCtenophores CnidariansGelatinousTransparent bodies*Lack stinging cellsPlanktonicFound mostly in surface
watersLuminescent/IridescentHave 8 rows of comb
platesUsed for locomotion