Lecture 9

Lecture 9 - Lecture 9 The Radiates They all have tentacles...

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Lecture 9 29/01/2008 08:58:00 The Radiates They all have tentacles All gelatinous Cnidarians possess a specialized cell, which is a stinging cell They are radially symmetrical Radial symmetry Animal can be folded along any axis and it will look the same There is also modified radial symmetry o You can’t cut it along any axis, only a particular one o Bi-radial symmetry is when you can cut only in four quarters (two  planes, happens when you have paired structures) o Tetra-radial symmetry is when you can cut only in 8 parts (4 planes) Because they have prey and predators coming at them from all around and  because they cannot move (to catch or protect), all sensory organs are  distributed 360 degrees Radiates are defined because all of them have some form of bilaterality from  the beginning True Tissues Have 2 layers so it is diploblastic, they are the only organisms that are
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Lecture 9 - Lecture 9 The Radiates They all have tentacles...

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