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Name: ___________________ Date: __________ UNIT 5 Notes #3 - Phylum Cnidarian A) Examples of Cnidarians 1.______________ -____________________________ -Spend ______________________________ -No medusa stage, other hydrazoans have a very short medusa stage. 2. __________________ -Class _________________ -Jellyfish go through the same life-cycle stages as hydrozoans -In Scyphozoans the ______________________________________________________ ________________________________________________________________________ The _____________________________________________________of most jellyfish are harmless to humans, but a few can cause painful stings. 3. ________________________________________ -Class ____________________ Anthozoans have ____________________________in their life cycle. B) Cnidarian_________________: Body Plan: - ____________________________________body with a single opening. - Opening will allow _____________________________________________________ - Surrounding the mouth is a ring of tentacles (usually contains stinging cells) - __________________contain nematocysts; when touched, the _________________ _________________________________________________________, paralyzing or trapping it. - Separating the outer ectoderm from the inner endoderm is a layer of mesoglea. (Mesoglea offers support for the animal). -The body has ________________________________________________________. a) ________________– Usually attached to some object with the_________________ __________________________________. - _________________(non-motile stuck to the bottom) b) _________________– __________________________________________________ _______________________________________________________ - Locomotion is achieved by individual ______________________________________ cells all working together to change shape. - Nematocysts fire on contact, after paralyzing its prey,________________________ _________________________________________. C) Various Body Systems: 1) DIGESTION: Food is _________________________________________________ _______________________in order to digest food. Other cells of the _____________ will then absorb the digested nutrients. Indigestible material will then _________ _________________________________ 2) CIRCULATION: ___________________________________________________. Food/nutrient particles will be passed through the central cavity by body movements and by flagellated cells in the endoderm. Thus the cavity is involved in both ___________________________________________________________________ 3) ____________________and______________________: -Both take place by ___________________________________that bathes the tissues. 4)NERVOUS: There is a limited amount of nervous and sensory tissue. This ______ ____ is used for co-ordination. Sensory cells are sensitive to touch and various chemicals. 5) MUSCULAR: ________________________________________________________ ________________________________________________________________________ 6) REPRODUCTION: ____________- Many_______________________________________________, this may form new polyps or medusae. _______________ - _______________reproduces sexually. _____________________ ___________which travel through the water to the ______which has produced eggs. - The fertilized eggs are released out of the mouth to develop into________________ _________________, this stage will usually develop into a polyp. - Some Cnidarians (ex hydra, sea anemone) have polyps that can also reproduce sexually. D) Advantages of Motile and Non-Motile Stages/Forms In Life Cycle: a) If motile,_________________________________________; if non-motile you stay _________________________________________________________ b) Advantage of being sessile (_________________) is that they _________________ _____________________________________________________________________ c) Disadvantage of being motile is that you can easily get carried away by the water currents. E) ________________________of Cnidarians: - ________________________________________with other animals. - ________________________________________for many marine animals. They contain tunnels, caves, and deep channels in which animals live. Coral reefs __________________________________________ and for animals that produce valuable shells, pearls, and jewelry. -Protect land from erosion by__________________________________. If destroyed, large amounts of shoreline maybe washed away. -____________________________________________________ by many Cnidarians. - _______________________________ - ______________________________