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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.
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www.ucmp.berkeley.edu/cnidaria/hydrozoa.html
www.ucmp.berkeley.edu/cnidaria/hydrozoa.html
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Another feature that is quite common in Hydrozoa but not typical of Scyphozoa is colonial organization. While a few hydrozoans, such as Hydra, are solitary polyps, most live in colonies made up of anywhere from a few to thousands of individual polyps.
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www.ucmp.berkeley.edu/cnidaria/hydrozoamm.html
www.ucmp.berkeley.edu/cnidaria/hydrozoamm.html
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The Hydrozoa is a subgroup of cnidarians containging approximately 3700 species. It is a diverse group with a variety of life cycles, growth forms, and specialized structures. Like many cnidarians, hydrozoans have both polyp and medusa stages in their life cycle.
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animaldiversity.ummz.umich.edu/site/accounts/informatio...
animaldiversity.ummz.umich.edu/site/accounts/information/Hydrozoa.html
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Hydrozoa (phylum Coelenterata, class Hydrozoa) are coelenterates that are closely related to the hydra, sea anemones, corals, and jellyfish. Although a large majority of these species are common and widespread, they are often overlooked, as they are all small animals.
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science.jrank.org/pages/3477/Hydrozoa.html
science.jrank.org/pages/3477/Hydrozoa.html
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Information about the classification, anatomy, and life cycle of this class, including photographs and diagrams. Also provides biographies and photos of ...
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www.ville-ge.ch/mhng/hydrozoa/hydrozoa-directory.htm
www.ville-ge.ch/mhng/hydrozoa/hydrozoa-directory.htm
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A brief overview of the hydrozoa ... Hydrozoa: Hydroids and Hydromedusae. From the Ordovician ... Trachylina - medusa stage only. These are perhaps the most primitive Hydrozoa. : Gonionemus...
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www.palaeos.com/Invertebrates/Cnidaria/Hydrozoa.htm
www.palaeos.com/Invertebrates/Cnidaria/Hydrozoa.htm
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Another sessile Hydrozoa is the Hydra which is truely unique among the Hydrozoans. The Hydra is solitary, lacks a medusoid phase and feeds with long tentacles that extend from around the mouth.
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oz.plymouth.edu/~lts/invertebrates/Primer/text/hydrozoa...
oz.plymouth.edu/~lts/invertebrates/Primer/text/hydrozoa.html
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Media in category "Hydrozoa" ... ITIS link: Hydrozoa Owen, 1843 ... World Register of Marine Species link: Hydrozoa Owen, 1843 (+species list...
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commons.wikimedia.org/wiki/Category:Hydrozoa
commons.wikimedia.org/wiki/Category:Hydrozoa
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Class Hydrozoa Owen, 1843 incertae sedis ... Hydrozoa, hydrozoans ... Hydrozoa Owen, 1843; Taxonomic Serial No.: 48739...
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www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=T...
www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=48739
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