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In the accompanying animation we examine the life cycle of a type of cnidarian called ; Obelia (class Hydrozoa). Like most cnidarians, Obelia undergoes a life cycle in which the generations alternate between two basic body forms, the medusa and the polyp forms.
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bcs.whfreeman.com/thelifewire/content/chp32/32020.html
bcs.whfreeman.com/thelifewire/content/chp32/32020.html
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First...
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krupp.wcc.hawaii.edu/BIOL200/powerpnt/cniddivr/sld004.h...
krupp.wcc.hawaii.edu/BIOL200/powerpnt/cniddivr/sld004.htm
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Members of the Phylum Cnidaria include the Anemones and are grouped with the soft and hard corals and the hydroids. Cnidarians all have a life cycle of two forms. One is a free-swimming jellyfish ... The above description is a simplified cnidarian life story and there are many variations within the different groups.
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www.mesa.edu.au/friends/seashores/cnidaria.html
www.mesa.edu.au/friends/seashores/cnidaria.html
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Cnidarians have a complex life cycle that, depending on the species, may alternate between two forms. The first form is known as a polyp, which is sessile (anchored to one spot). The polyps are tubular in shape, with the mouth, often lined with tentacles, facing upwards.
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www.angelfire.com/mo2/animals1/phylum/jellyfish.html
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The Life Cycle of a Jellyfish ... Jellyfish - The Life Cycle of a Jellyfish ... Basic Cnidarian Anatomy - Cnidarian Anatomy and Structure...
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animals.about.com/od/cnidarians/ss/cnidarians_4.htm
animals.about.com/od/cnidarians/ss/cnidarians_4.htm
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During their life cycle, jellyfish experience an alternation of generations in which one generation (the medussa) reproduces sexually and the next generation (the polyp) reproduces asexually. The medusa form is the dominant and most recognized form of the jellyfish. ... Polyp - Polyp Stage of the Cnidarian Life Cycle...
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animals.about.com/od/cnidarians/a/lifecyclejellyf.htm
animals.about.com/od/cnidarians/a/lifecyclejellyf.htm
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Many cnidarian species exist in two different body forms during their life cycle: the free-swimming form, called the medusa (a jellyfish for instance), and the stationary form called the polyp (which resembles a tiny sea anemone).
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www.pbs.org/kcet/shapeoflife/animals/cnidaria.html
www.pbs.org/kcet/shapeoflife/animals/cnidaria.html
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The hydromedusae therefore represent only part of the life cycle of each animal, and it is important to realize that their usually-attached polyps/hydroids must be considered when one thinks about the ecology of these organisms. ... I have recently put together a rather technical list of those Cnidarian species,
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faculty.washington.edu/cemills/Hydromedusae.html
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The life cycle of most schyphozoans is more complex than that of the hydrozoans. It begins with the PLANULA LARVAE (Fig 3); formed sexually by the fusion of eggs and sperm from mature jellyfish). The planula is a flattened ciliated larva.
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cas.bellarmine.edu/tietjen/images/cnidarians.htm
cas.bellarmine.edu/tietjen/images/cnidarians.htm
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