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en.wikipedia.org/wiki/Coelenterata

Coelenterata is a term encompassing the animal phyla Cnidaria and Ctenophora (comb jellies). The name comes from the Greek "koilos" ("hollow") and "enteron" ( "intestine"), referring to the hollow body cavity common to these two phyla. They have very simple tissue organization, with only two layers of cells ... These tentacles surround a spacious cavity called the gastrovascular cavity ...

en.wikipedia.org/wiki/Cnidaria

Cnidaria is a phylum containing over 10,000 species of animals found exclusively in aquatic ... They have two basic body forms: swimming medusae and sessile polyps, both of ... In some species, cnidocytes can also be used as anchors. ..... called Coelenterata ("hollow guts"), because Cnidaria and Ctenophora both rely on ...

www.answers.com/Q/Cnidarians_are_also_called_Coelenterates_because_they_have

a hollow gut.

www.encyclopedia.com/plants-and-animals/animals/zoology-invertebrates/cnidaria

Get information, facts, and pictures about Cnidaria at Encyclopedia.com. Make research projects and school reports about Cnidaria easy with credible articles ... Most cnidarians possess tentacles, and many also have nematocysts ... and leads to an internal digestive cavity called the gastrovascular cavity . ..... Coelenterata.

www.thoughtco.com/cnidaria-phylum-profile-2291823

Information about the cnidaria - the phylum that contains corals, jellyfish, sea ... Cnidarians are also known as coelenterates - a reference to the name for their digestive ... they may live anywhere from shallow, coastal habitats to the deep sea. ... may also need to beware of certain cnidarians because of their powerful stings.

www.thoughtco.com/cnidarian-definition-3863683

Feb 28, 2016 ... Cnidarians also have tentacles. ... Although they can sting, not all cnidarians pose a threat to humans. ... Cnidarians have two body layers called the epidermis and gastrodermis. ... Also Known As Coelenterate, Coelenterata.

www.britannica.com/animal/cnidarian

May 12, 2017 ... Cnidarian, also called coelenterate, any member of the phylum Cnidaria .... be said to have true ovaries and testes because they lack organs.

artksthoughts.blogspot.com/2009/07/coelenterates-cnidarians-and-larvae.html

Jul 7, 2009 ... They have two archetypal body forms, the polyp and the medusa, and most lineages ... One of the shared features among them are cnidocytes (also called ... because they require more time and energy to modify their structure ...

www.biologycorner.com/worksheets/articles/hydra.html

... to a group of organisms known as cnidarians or sometimes called coelenterates. ... Because they belong to the animal kingdom, you can also assume that all ... Coral reefs are actually made from the skeletons of cnidarians that have build ... The ones that sit on a surface with their tentacles pointing up are called polyps.

encyclopedia2.thefreedictionary.com/Coelenterata

(sīlĕn'tərā`tə), another name for the phylum CnidariaCnidaria ... The central body cavity is the gastrovascular cavity, also called the enteron or coelenteron. ... The morphologically simplest coelenterates, the Hydrozoa, have nematocysts limited ... In most, the gametes are released to the external environment, where they are  ...