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Published byMabel Shelton Modified over 9 years ago
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The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the animals with true tissues Phylum Cnidaria – Is one of the oldest groups in this clade
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Cnidarians – Have diversified into a wide range of both sessile and floating forms including jellies, corals, and hydras – But still exhibit a relatively simple diploblastic, radial body plan
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The basic body plan of a cnidarian – Is a sac with a central digestive compartment, the gastrovascular cavity – There are two types of body The polyp, a sessile attached form and Medusa, a free floating active form A single opening – Functions as both mouth and anus
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http://webs.lander.edu/rsfox/invertebrates/hydra.html Anatomy of a polyp
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Anatomy of a medusa http://webs.lander.edu/rsfox/invertebrates/aurelia.html
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Cnidarians are carnivores – That use tentacles to capture prey The tentacles are armed with cnidocytes – Unique cells that function in defense and the capture of prey http://www.tarleton.edu/~biology/pfau/BIOL1214/lectures/2acoelomates/cnidarians.htm
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A cnidocyte of a hydra Tentacle “Trigger” Nematocyst Coiled thread Discharge Of thread Cnidocyte Prey Campbell & Reece, Biology, 7th Ed., Pearson
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Scyphozoans In the class Scyphozoa – Jellies (medusae) are the prevalent form of the life cycle In the class Cubozoa, which includes box jellies and sea wasps – The medusa is box-shaped and has complex eyes Class Anthozoa includes the corals and sea anemones – Which occur only as polyps
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Physalia Hydrozoa
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float tentacles Digestive polyps Reproductive polyps
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Vellela vellela (By the Wind Sailor) http://www.flickr.com/photos/nativeagle/ 101348346/in/photostream/
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Hydrozoa http://animaldiversity.ummz.umich.edu/site/accounts/pictures/Hydrozoa.html
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Scyphozoans
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Class - Cubozoa Box Jellies
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Hydrozoans Most hydrozoans – Alternate between polyp and medusa forms http://orion1.paisley.ac.uk/courses/Tatner/biomedia/pictures/hydro.htm
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An animal that eats jellyfish, the Sunfish
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http://www.earthwindow.com/mola.html#
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