Download 3) Sponges and Cnidarians

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Marine pollution wikipedia, lookup

Marine life wikipedia, lookup

Transcript
November 15, 2011
Sponges and Cnidarians
Characteristics of Sponges
• Sessile - cannot move, are attached to one place.
• Filter Feeders – take out tiny organisms and oxygen from the water as it
passes over the sponge.
• Flagella– thin, whiplike structures that help move water over the
sponge.
• Have soft bodies that are supported by sharp, needle like structures.
• Bodies are asymmetrical
Characteristics of Cnidarians
• Have tentacles that surround their mouth to catch food and for
protection.
• Tentacles have stinging cells on them.
• Get Oxygen from water passing over body.
• All have radial symmetry
2 Body Forms of Cnidarians
1) Polyp – vase shaped body, attached to ground
*example – sea urchin and sea anemones
2) Medusa– bell shaped body, free swimming
*example – jellyfish