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Limnomedusae
Limnomedusae is an order of hydrozoans. Taxonomy The taxon was erected by Danish marine biologist Paul Lassenius Kramp in 1938 to accommodate certain families of hydrozoans with biphasic life histories. It includes genera with medusae with ecto-endodermal statocysts and with gonads alongside their radial canals, and also genera which have polyps that are not covered by a theca. Molecular analysis performed by Collins in 2006 has since shown that the Limnomedusae are not monophylic. The family Armorhydridae, which contains a single genus and a single species, '' Armorhydra janowiczi'', is found living in coarse sediment, has hollow tentacles and has no radial canals. It seems to share few morphological features with the other families and probably belongs elsewhere. The inclusion of Microhydrulidae is also dubious. The medusa stage is not known and the tiny polyp has no tentacles nor mouth. Systematic list The World Register of Marine Species currently lists the following fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrozoans
Hydrozoa (hydrozoans; ) are 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), "air fern" (''Sertularia argentea''), and pink-hearted hydroids (''Tubularia''). Anatomy Most hydrozoan species include both a polypoid and a medusoid stage in their lifecycles, although a number of them have only one or the other. For example, ''Hydra'' has no medusoid stage, while '' Liriope'' lacks the polypoid stage. Polyps The hydroid fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microhydrulidae
Microhydrulidae is a family of cnidarians belonging to the order Limnomedusae. Genera: * ''Microhydrula ''Microhydrula'' is a genus of cnidaria Cnidaria () is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter. Their distinguishing fea ...'' Valkanov, 1965 * '' Rhaptapagis'' Bouillon & Deroux, 1967 References Limnomedusae Cnidarian families {{Hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medusa (biology)
Jellyfish and sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are anchored to the seabed by stalks rather than being mobile. The bell can pulsate to provide propulsion for highly efficient locomotion. The tentacles are armed with stinging cells and may be used to capture prey and defend against predators. Jellyfish have a complex life cycle; the medusa is normally the sexual phase, which produces planula larvae that disperse widely and enter a sedentary polyp phase before reaching sexual maturity. Jellyfish are found all over the world, from surface waters to the deep sea. Scyphozoans (the "true jellyfish") are exclusively marine, but some hydrozoans with a similar appearance live in freshwater. Large, often colorful, jellyfish are common in coa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olindiidae
Olindiidae is a family of hydrozoans in the order Limnomedusae. They have a polyp (zoology), polyp phase and a Jellyfish, medusa phase. The polyps are generally small (1 mm) and solitary, but a few species are colonial. They have a varying number of tentacles and can reproduce by budding. In the largest species, the medusae can grow to . Centripetal canals may be present or absent and the radial canals are unbranched. The gonads are beside the radial canals, except in ''Limnocnida'', where they are on the manubrium. The fertilised eggs develop into planula larvae which become polyps. These multiply Asexual reproduction, asexually or can bud off medusae. In some species, medusae are only produced when the water temperature exceeds a certain level. Most species are marine, but several can also be found in brackish water and a few, notably ''Craspedacusta'' (such as ''Craspedacusta sowerbii, C. sowerbii'') and ''Limnocnida'', are found in fresh water.Didžiulis, Viktoras: Craspe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Armorhydridae
Armorhydridae is a family of cnidarians belonging to the order Limnomedusae Limnomedusae is an order of hydrozoans. Taxonomy The taxon was erected by Danish marine biologist Paul Lassenius Kramp in 1938 to accommodate certain families of hydrozoans with biphasic life histories. It includes genera with medusae with ec .... Genera: * '' Armorhydra'' Swedmark & Teissier, 1958 References Limnomedusae Cnidarian families {{Hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monobrachium
''Monobrachium'' is a genus of hydroids. These marine cnidarians form the only genus of the monotypic family Monobrachiidae. Species The genus contains the following species: * ''Monobrachium antarcticum'' Robins, 1972 * ''Monobrachium drachi'' Marche-Marchad, 1963 * ''Monobrachium parasitum ''Monobrachium'' is a genus of hydroids. These marine cnidarians form the only genus of the monotypic family Monobrachiidae. Species The genus contains the following species: * ''Monobrachium antarcticum'' Robins, 1972 * ''Monobrachium drachi ...'' Mereschkowsky, 1877 References External links * Limnomedusae Hydrozoan genera {{Hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monobrachiidae
''Monobrachium'' is a genus of hydroids. These marine cnidarians form the only genus of the monotypic family Monobrachiidae. Species The genus contains the following species: * ''Monobrachium antarcticum'' Robins, 1972 * ''Monobrachium drachi'' Marche-Marchad, 1963 * ''Monobrachium parasitum ''Monobrachium'' is a genus of hydroids. These marine cnidarians form the only genus of the monotypic family Monobrachiidae. Species The genus contains the following species: * ''Monobrachium antarcticum'' Robins, 1972 * ''Monobrachium drachi ...'' Mereschkowsky, 1877 References External links * Limnomedusae Hydrozoan genera {{Hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Olindias Formosa
The flower hat jelly (''Olindias formosus'') is a species of hydromedusa in the hydrozoan family Olindiidae. Although they look like a jellyfish, they actually belong in the class Hydrozoa, while true jellyfish belong in class Scyphozoa. Flower hat jellies occur in the northwestern Pacific off central and southern Japan, and South Korea's Jeju Island.Patry, W.; T. Knowles; L. Christianson; M. Howard (2014). The hydroid and early medusa stage of Olindias formosus (Cnidaria, Hydrozoa, Limnomedusae). Journal of the Marine Biological Association of the United Kingdom 94(7): 1409–1415. (close relatives live elsewhere, like '' O. sambaquiensis'' found off Argentina and Brazil).Resgalla Junior, C.; A.L. Rosseto; V. Haddad Jr (2011). Report of an outbreak of stings caused by Olindias sambaquiensis Muller, 1861 (Cnidaria: hydrozoa) in Southern Brazil. Braz. j. oceanogr. 59(4). The adult form of the flower hat jelly only lives a few months and is typically seen from December to July ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Statocyst
The statocyst is a balance sensory receptor present in some aquatic invertebrates, including bivalves, cnidarians, ctenophorans, echinoderms, cephalopods, and crustaceans. A similar structure is also found in ''Xenoturbella''. The statocyst consists of a sac-like structure containing a mineralised mass (statolith) and numerous innervated sensory hairs (setae). The statolith's inertia causes it to push against the setae when the animal accelerates. Deflection of setae by the statolith in response to gravity activates neurons, providing feedback to the animal on change in orientation and allowing balance to be maintained. In other words, the statolith shifts as the animal moves. Any movement large enough to throw the organism off balance causes the statolith to brush against tiny bristles which in turn send a message to the brain to correct its balance. It may have been present in the common ancestor of cnidarians and bilaterians. Hearing In cephalopods like squids, statocysts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Lassenius Kramp
Paul Lassenius Kramp (28 January 1887 – 13 July 1975) was a Danish marine biologist Marine biology is the scientific study of the biology of marine life, organisms in the sea. Given that in biology many phyla, families and genera have some species that live in the sea and others that live on land, marine biology classifi .... He is best known for his extensive monographs on jellyfish., Several marine taxa have been named in his honor.Biographical Etymology of Marine Organism Names. http://www.tmbl.gu.se/libdb/taxon/personetymol/petymol.k.html Eponymous taxa *''Aequorea krampi'' Bouillon, 1984 *''Amphinema krampi'' Russell, 1956 *''Calycopsis krampi'' Petersen, 1957 *''Convexella krampi'' (Madsen, 1956) *''Escharina krampi'' Marcus, 1938 *''Eutima krampi'' Guo, Xu & Huang, 2008 *''Krampella'' Russell, 1957 *''Krampia'' Ditlevsen, 1921 *''Mohnia (Tacita) krampi'' (Thorson, 1951) *''Ransonia krampi'' (Ranson, 1932) *''Tomopteris krampi'' Wesenberg-Lund, 1936 References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gossea (hydrozoan)
''Gossea'' is a genus of hydrozoans belonging to the family Olindiidae Olindiidae is a family of hydrozoans in the order Limnomedusae. They have a polyp (zoology), polyp phase and a Jellyfish, medusa phase. The polyps are generally small (1 mm) and solitary, but a few species are colonial. They have a varying .... The species of this genus are found in Europe and America. Species: *'' Gossea brachymera'' *'' Gossea corynetes'' *'' Gossea faureae'' *'' Gossea indica'' References Olindiidae Hydrozoan genera {{Hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
