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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 ...

en.wikipedia.org/wiki/Coelenterata

Coelenterata is an obsolete 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 ...

www.answers.com/Q/Cnidarians_are_also_called_Coelenterates_because_they_have

Cnidarians are also called Coelenterates because they have? ... They have a hollow Body Tentacles with stinging cells One body opening (mouth and anus) ...

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

Most cnidarians possess tentacles, and many also have nematocysts ... and leads to an internal digestive cavity called the gastrovascular cavity . ... One hypothesis about the origin of nematocysts suggests that they were .... the seacoasts everywhere, economically important because they foul surfaces. ..... Coelenterata.

www.britannica.com/animal/cnidarian

Sep 8, 2017 ... Cnidarian, also called coelenterate, any member of the phylum Cnidaria .... be said to have true ovaries and testes because they lack organs.

www.thoughtco.com/cnidarian-definition-3863683

Feb 28, 2016 ... Cnidarians also have tentacles. ... Cnidarians have two body layers called the epidermis and gastrodermis. ... Overall, though, they have two main body plans: polypoid, in which ... Also Known As Coelenterate, Coelenterata.

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

May 29, 2017 ... Cnidarians are also known as coelenterates - a reference to the name ... They are found in a variety of water depths and closeness to shore ... Swimmers and divers may also need to beware of certain cnidarians because of ...

www.oceaninn.com/en-us/wildlife/cnidarians.htm

When the nematocyst is called upon to fire, the thread is uncoiled, and ... Most Cnidarians also have a toxin in their stinger that helps immobilize the prey. .... They are considered plankton because they cannot swim on their own—they are  ...

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  ...