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Hydra. Hydra is included in the phylum Cnidaria, along with sea anemones, jellyfish and coral polyps, and is one of the few freshwater members of this group. One feature all members of the Cnidaria have in common is the possession of thread cells or cnidia or nematocysts -- tiny stinging cells located in the body...
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www.micrographia.com/specbiol/cnidari/hydrozo/hydr0100....
www.micrographia.com/specbiol/cnidari/hydrozo/hydr0100.htm
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Pond supplies, Cnidarians-Hydra Live Invertebrates, Niles Biological, Inc., Biological supplies, FOSS and STC refill kits, Owl Pellets, life science and biology supplies. ... Hydra are small aquatic invertebrates belonging to the order Hydroida, in the class Hydrozoa, phylum Cnidaria.
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www.nilesbio.com/subcat331.html
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Hydras are tiny (3 to 8 mm) aquatic invertebrates of the phylum Cnidaria. Cnidarians have two principal body forms: a polyp stage, which is a form attached to a substrate (like sea anemones or Hydras), and a medusa stage, which is a free-floating or swimming form (like jellyfishes).
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www.astrographics.com/GalleryPrintsIndex/GP2027.html
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Sea anemones, corals, jellyfish, sea pens, hydra ... The exclusively aquatic phylum Cnidaria is represented by polyps such as sea anemones and corals, and by medusae such as jellyfish. A polypoid or a medusoid cnidarian is a radially or biradially symmetrical, uncephalized animal with a single body opening, the mouth.
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tolweb.org/cnidaria
tolweb.org/cnidaria
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Learn more about Cnidaria in "Life on the Move" ... Website links about Cnidaria ... 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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The Phylum Cnidaria includes such diverse forms as jellyfish, hydra, sea anemones, and corals. Cnidarians are radially or biradially symmetric, a general type of symmetry believed primitive for eumetazoans.
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www.mavicanet.com/directory/eng/3690.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. ... You may also wish to look for links on UC Irvine's Cnidaria Home Page.
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www.ucmp.berkeley.edu/cnidaria/hydrozoa.html
www.ucmp.berkeley.edu/cnidaria/hydrozoa.html
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Cnidaria - Wikipedia, the free encyclopedia
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Cnidaria (pronounced /naɪˈdɛəriə/ with a silent c ) is a phylum containing over 9,000 species of animals found exclusively in aquatic, mostly marine, environments. Their distinguishing featur...
en.wikipedia.org/wiki/Cnidaria
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A common organism to study in a biology lab is the hydra. The hydra belongs to a group of organisms known as cnidarians or sometimes called coelenterates. This phylum also includes animals such as the jellyfish and sea anemone and the organisms that make up coral reefs.
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www.biologycorner.com/worksheets/articles/hydra.html
www.biologycorner.com/worksheets/articles/hydra.html
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