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Cnidarians are incredibly diverse in form, as evidenced by colonial siphonophores, massive medusae and corals, feathery hydroids, and box jellies with complex eyes. ... There are four major groups of cnidarians: Anthozoa, which includes true corals, anemones, and sea pens; Cubozoa, the amazing box jellies with complex...
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www.ucmp.berkeley.edu/cnidaria/cnidaria.html
www.ucmp.berkeley.edu/cnidaria/cnidaria.html
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Cnidarians are the simplest organisms that have attained a tissue level of organization. They consist of little more than an outer covering (the epidermis) and an inner gastrodermis with a non-cellular mesoglea sandwiched between the two (Fig 1). Mucus-secreting cells cover the animal with a protective slime.
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cas.bellarmine.edu/tietjen/images/cnidarians.htm
cas.bellarmine.edu/tietjen/images/cnidarians.htm
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Cnidarians are radially or biradially symmetric, a general type of symmetry believed primitive for eumetazoans. They have achieved the tissue level of organization, in which some similar cells are associated into groups or aggregations called tissues, but true organs do not occur.
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animaldiversity.ummz.umich.edu/site/accounts/informatio...
animaldiversity.ummz.umich.edu/site/accounts/information/Cnidaria.html
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Typical cnidarians alternate each generation between a fixed polyp stage and a free living medusoid stage. Most cnidarians are considered carnivores because of their ability to actually catch food with their stinging cells called nematocysts.
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paleo.cortland.edu/tutorial/Cnidarians/cnidarians.htm
paleo.cortland.edu/tutorial/Cnidarians/cnidarians.htm
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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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Oceanside Meadows Innstitute for the Arts and Sciences presents: Wonders of the Sea: Cnidarians ... Types of Cnidarians ... Cnidarians are incredibly diverse in form. Yet, these diverse animals are united because they are all armed with stinging cells called cnidocytes and contain a structure called a nematocyst.
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www.oceaninn.com/guides/cnidarians.htm
www.oceaninn.com/guides/cnidarians.htm
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All Cnidarians are acoelomates (no body cavity); they have stinging cells called nitoblasts. These nitoblasts have hair triggers with a powerful neurotoxin. Cnidarians have both sexual and asexual reproduction cycles.
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www.cyhaus.com/marine/cnidaria.htm
www.cyhaus.com/marine/cnidaria.htm
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Cnidarians of all living orders have been maintained in synthetic water in captive systems. The general rules apply. Shallow water varieties are more tolerant of environmental range and rapid change, metallic contamination and treatment is a no-no.
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www.wetwebmedia.com/cnidaria.htm
www.wetwebmedia.com/cnidaria.htm
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[nī-dâŕē-ən]
