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Around the inside of the opening is a muscular ring of tissue called the velum. The velum can contract and relax, changing the diameter of the opening, and playing an important role in swimming The presence of the velum is a diagnostic character for Hydrozoa, ... Class Hydrozoa hydralike animals, hydroids, and hydrozoans...
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animaldiversity.ummz.umich.edu/site/accounts/informatio...
animaldiversity.ummz.umich.edu/site/accounts/information/Hydrozoa.html
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The animals of the class hydrozoa have both a polyp and medusa stage. Siphonophores are a type of hydrozoan with a float for buoyancy. Probably the most famous of these is the species physalia, the Portugese-man-of-war, which is a type of colonial siphonophore.
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www.cyhaus.com/marine/hydroids.htm
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Hydrozoa - Wikipedia, the free encyclopedia
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Hydrozoa ( hydrozoans ) are a taxonomic class of very small, predatory animals which can be solitary or colonial and which mostly live in saltwater. A few genera within this class live in freshwate...
en.wikipedia.org/wiki/Hydrozoa
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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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Hydras are predatory animals belonging to the phylum Cnidaria and the class Hydrozoa. They can be found in most unpolluted freshwater ponds, lakes and streams in the temperate ... Air fern or "Neptune plant" is a name given to a product that is in fact composed of a species of marine animal called Sertularia argentea,
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www.absoluteastronomy.com/topics/Hydrozoa
www.absoluteastronomy.com/topics/Hydrozoa
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Hydrozoa are a taxonomic Class of very small, predatory animals which can be ... of marine animal called Sertularia argentea, also known as the "sea fir". ...
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www.absoluteastronomy.com/topics/Hydroida
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The Hydrozoa are all aquatic, and the great majority are marine. The class includes both simple and composite organisms, ... Owing to the great difficulty which is ordinarily experienced by the student in mastering the details of this class of animals, it has been thought advisable to introduce here a short explanation of...
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chestofbooks.com/animals/Manual-Of-Zoology/Class-I-Hydr...
chestofbooks.com/animals/Manual-Of-Zoology/Class-I-Hydrozoa.html
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9. Which class of the phylum Cnidaria occurs only as a polyp? a. hydrozoa b. scyphozoa c. anthozoa d. hydrozoa and anthozoa e. hydrozoa, scyphozoa, and anthozoa; 10. Which class of the phylum Cnidaria includes the animals commonly called jellyfish?
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upper.usm.k12.wi.us/academics/faculty/rheun/apsqch29.ht...
upper.usm.k12.wi.us/academics/faculty/rheun/apsqch29.html
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Animals, such as roundworms, which have a space between the mesoderm and the endoderm are called pseudocoelomates, ... This includes animals like jellyfish (Class Scyphozoa), coral and sea anemones (Class Anthozoa [anthe = flower; zoa = animal]), all of which are marine, plus Hydra, a freshwater genus (Class Hydrozoa).
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infohost.nmt.edu/~klathrop/LowerAnimals.htm
infohost.nmt.edu/~klathrop/LowerAnimals.htm
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