Hydra (genus) - Wikipedia, the free encyclopedia
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Hydra is a genus of simple fresh-water animal possessing radial symmetry. Hydras are predatory animals belonging to the phylum Cnidaria and the class Hydrozoa. They can be found in most unpolluted ...
en.wikipedia.org/wiki/Hydra_(genus)
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The life cycle typically includes a planula larva. Cnidarians are chiefly marine but the well-known Hydra is an exception. ... Medusozoa comprises those cnidarians whose life cycle includes a medusa generation that alternates with a polyp generation (Fig 7-75B). Symmetry is radial and tetramerous.
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webs.lander.edu/rsfox/invertebrates/hydra.html
webs.lander.edu/rsfox/invertebrates/hydra.html
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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). ... Hydra sp.
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www.pbs.org/kcet/shapeoflife/animals/cnidaria.html
www.pbs.org/kcet/shapeoflife/animals/cnidaria.html
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(for more information on the Hydra, check out this cool web site) ... The hydra is a member of the Coelenterate phylum, which is characterized by having two cell layers, and a hollow body with only one opening. The hydra is a small organism. It’s one opening, the mouth, is surrounded by tentacles, which move food into...
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faculty.plattsburgh.edu/margaret.campion/seconded/lucas...
faculty.plattsburgh.edu/margaret.campion/seconded/lucas/Hydra.htm
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Alder, H. and Schmid, V., 1986. The role of the cell cycle in transdifferentiation of mononucleated cross striated muscle cells into smooth muscle and sensory cells in vitro. Prog. Clin. Biol. Res. 217A, 27-34. ... Anonymous, 1951. Structure and function of hydra. Water Life 6, 181.
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www.biology.pomona.edu/martinez/library.html
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Perhaps the best-known hydrozoan, familiar to most students of introductory biology, is Hydra, pictured at left. Hydra never goes through a medusoid stage and spends its entire life as a polyp. However, Hydra is not typical of the Hydrozoa as a whole.
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www.ucmp.berkeley.edu/cnidaria/hydrozoa.html
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Sea anemones, corals, jellyfish, sea pens, hydra ... The text-book depiction of the typical cnidarian life cycle is an alternation between a medusa and a polyp (termed metagenesis), the former the sexually reproductive stage and the latter the asexual stage. In fact, an attribute of the entire class Anthozoa is the absence...
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tolweb.org/tree?group=Cnidaria&contgroup=Animals
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Hydra hymanae, a hermaphroditic freshwater coelenterate, reproduces asexually at 24 degrees C and sexually at 15 degrees C. The appearance of gonads begins 12 days after transfer from 24 degrees to 15 degrees C and is complete 35 days after the temperature transition.
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www.sciencemag.org/cgi/content/abstract/194/4265/618
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In Greek mythology, one of the great tests of Hercules was to kill a many-headed monster known as the Hydra. Every time Hercules cut off one of its heads, two more grew in its place. ... Also, it may be more hopeful to somehow try and modify the life cycles of certain pathogens (perhaps even by easing their transmission),
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bitesizebio.com/2007/12/13/battling-disease-%E2%80%93-t...
bitesizebio.com/2007/12/13/battling-disease-%E2%80%93-the-real-life-hydra/
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