Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) 'water', and ζῷον (zôion) 'animal') is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specialized individual animals cannot survive outside the colony. A few genera within this class live in freshwater habitats. Hydrozoans are related to jellyfish and corals and belong to the phylum Cnidaria.
Some examples of hydrozoans are the freshwater jelly (Craspedacusta sowerbyi), freshwater polyps (Hydra), Obelia, Portuguese man o' war (Physalia physalis), chondrophores (Porpitidae), and pink-hearted hydroids (Tubularia).
Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) 'water', and ζῷον (zôion) 'animal') is a taxonomic class of individually very small, predatory animals...
Schuchert P, ed. (2012). "Turritopsis dorhnii (Weissmann, 1883)". World Hydrozoa database. World Register of Marine Species. Retrieved November 29, 2012...
Cnidaria, and is often considered a subphylum. It includes the classes Hydrozoa, Scyphozoa, Staurozoa and Cubozoa, and possibly the parasitic Polypodiozoa...
Siphonophorae (from Greek siphōn 'tube' + pherein 'to bear') is an order within Hydrozoa, which is a class of marine organisms within the phylum Cnidaria. According...
Velella is a monospecific genus of hydrozoa in the Porpitidae family. Its only known species is Velella velella, a cosmopolitan (widely distributed) free-floating...
individual is actually a colony of hydrozoan polyps. The taxonomic class, Hydrozoa, falls under the phylum Cnidaria, which includes anemones, corals, and...
sea pens); swimming Scyphozoa (jellyfish); Cubozoa (box jellies); and Hydrozoa (a diverse group that includes all the freshwater cnidarians as well as...
while the medusa stage is a singular, planktonic organism. Generally in hydrozoa the medusa develops from the asexual budding of the polyp and the polyp...
related more closely to scyphozoan jellyfish than either are to the Hydrozoa. Hydrozoa medusae also have tetra-radial symmetry, nearly always have a velum...
created by A.K. Totton in 1954 to accommodate these unusual genera of Hydrozoa as their taxonomic affinities were unclear. They had previously been placed...
Capitata is a suborder of Hydrozoa, a class of marine invertebrates belonging to the phylum Cnidaria. Members of this suborder are characterised by the...
Amphisbetia is a genus of hydrozoa in the family Sertulariidae described by L. Agassiz in 1862 based on the type species Amphisbetia operculata (Linnaeus...
animal species that have both polyp and medusa stages in their life cycle. Hydrozoa belongs to the phylum Cnidaria, which are aquatic (mainly marine) organisms...
"Complex neural architecture in the diploblastic larva of Clava multicornis (Hydrozoa, Cnidaria)". The Journal of Comparative Neurology. 519 (10): 1931–1951...
was born in Ballarat. She is best known for her work on the taxonomy of Hydrozoa (hydroids) and for being one of the first female Scuba divers in Australia...
Accessed through: Schuchert, P. (2014) World Hydrozoa database at http://www.marinespecies.org/hydrozoa/aphia.php?p=taxdetails&id=13551 on 2014-10-31...
(2005a): The Hydrozoa Directory - Hydrozoan Phylogeny and Classification. Retrieved 2008-JUL-08. Schuchert, Peter (2005b): The Hydrozoa Directory - Order...
December 1926 – 29 March 2009) was a Belgian marine biologist and expert on Hydrozoa. Jean Bouillon was born in Uccle, Belgium. He worked from 1955 to 1991...
Schuchert, P. (2011). Schuchert P (ed.). "Hydra vulgaris Pallas, 1766". World Hydrozoa database. World Register of Marine Species. Retrieved 2011-12-18. Hydra...
Loman-Ramos, Lucio (2014). "Biodiversidad de Medusozoa (Cubozoa, Scyphozoa e Hydrozoa) en México". Revista Mexicana de Biodiversidad. 85, Supp. 1: 154–163. doi:10...
Although they look like a jellyfish, they actually belong in the class Hydrozoa, while true jellyfish belong in class Scyphozoa. Flower hat jellies occur...
change colour; some are covered with other organisms such as algae or hydrozoa. In keeping with this camouflage, frogfishes typically move slowly, lying...
dead and dried colonies of hydrozoans, colonies of marine hydroids, class Hydrozoa, phylum Cnidaria. Hydroids are related to corals and jellyfish. These dried...
Schuchert (2010). Schuchert P (ed.). "Zyzzyzus Stechow, 1921d". World Hydrozoa database. World Register of Marine Species. Retrieved July 25, 2012. G...
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