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The Hydrazoa

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The Hydrazoa
The Hydrozoa is a predatory organism which is quite small, although visible to the naked eye. (2) “The first record of Eutonina scintillans Bigelow, (Hydrozoa) was in temperate waters of the southwestern Atlantic Ocean in 1909.” Although first found in salt water, hydrozoans can also live in freshwater. Hydrozoans tend to live in colonies because if left alone, some cannot survive. Hydrozoans produce sexually, meaning an egg and sperm connect and form an embryo. (1) “Most hydrozoans show the same alternation between polyp and medusa phases that the Scyphozoa, or "true" jellyfish, have. A fertilized egg develops into a sessile polyp, which buds asexually and eventually buds off one or more medusae. The medusa produce eggs and sperm, reproduce sexually, and thus the cycle is repeated.” Occasionally what can happen is the medusa does not break away from the parent and is forced into a state of arrested development. A hydrozoan is closely related to jellyfish and corals. (3) “Though these organisms feed on smaller organisms, their digestive system is a simple gastrovascular cavity lined with flagellated cells that circulate food in with the filtering of water.” They can filter water through their body to consume organisms in the water just as sponges do. One advantage hydrozoans have is the ability to grab and paralyze its prey making it rather easy to capture its meal. Historically, the hydrozoans have been divided into a number of orders, according to the way they grow and reproduce. (4) “Hydrozoans or “water animals” belong to the phylum Cnidaria. Cnidaria, which means “stinging thread” contain over 10,000 species, 3200 of them belonging to class Hydrozoa. This phylum includes things such as Sea Anemones, Jellyfish, and Corals to sum it up. They are similar in that they possess radial symmetry, and all possess nematocysts that sting, which is mostly how they subdue their prey.” Hydrozoans have a wide variety of classifications and species allowing


Cited: 1. "Hydrozoa: More on Morphology." Hydrozoa Morphology. N.p., n.d. Web. 10 Nov. 2013.http://www.ucmp.berkeley.edu/cnidaria/hydrozoamm.html 2. "SciELO - Scientific Electronic Library Online." SciELO - Scientific Electronic Library Online. N.p., n.d. Web. 10 Nov. 2013. http://www.scielo.cl/scielo.php?pid=S0717 3. Class Hydrozoa." Index of /. N.p., n.d. Web. 10 Nov. 2013.http://jupiter.plymouth.edu/~lts/invertebrates/Primer/text/hydrozoa.html 4. N.p., n.d. Web. 10 Nov. 2013. http://dept.lamar.edu/biology/faculty/abc/student%20pages/justin%20pittman.htm
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