MT Spr 08 02 Cnidaria

MT Spr 08 02 Cnidaria - PHYLUM CNIDARIA TISSUE level of...

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TISSUE level of body organization Middle layer = MESOGLEA = Acellular matrix (Just jelly!) Diagnostic cell type = CNIDOCYTE It contains the Nematocyst organelle PHYLUM CNIDARIA
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A B C A = ? B = ? C = ? ? Cnidocyte vs. Nematocyst
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(2 tissue layers) C = Epidermis (E) & A = Gastrodermis (G) with B = Mesoglea in between the two Cnidarians are DIPLOBLASTIC Insert: A Cnidocyte – cell containing a Nematocyst - organelle not yet triggered. E E G G M
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Specialized cells called cnidocytes contain nematocysts. These are used for anchorage, defense and capture of prey. Phylum Cnidaria Close-up of Nematocysts
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Cnidarian Life Cycles Hydrozoa Polyp dominant Medusa does exist (Hydra is cute but odd!) Remember the fire coral! Scyphozoa Medusa dominant Polyp does exist Anthozoa Polyp only
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Do you know the difference between a bud and a gonad? Cnidocyte-bearing tentacles, mouth, GVC & bud (branch = asexual reproduction) [fig 2.2]
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Which structure is used for what function?
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PHYLUM Cnidaria
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MT Spr 08 02 Cnidaria - PHYLUM CNIDARIA TISSUE level of...

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