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Aequoreidae
Aequoreidae is a family of hydrozoans, sometimes called the many-ribbed jellies or many-ribbed jellyfish. There are approximately 30 known species found in temperate and tropical marine coastal environments. Aequoreids include ''Aequorea victoria'', the organism from which the green fluorescent protein gene was isolated. Polyps Only the polyp stages of '' Aequorea'' species have been observed. The colonies are covered with chitinous periderm and can be either prostrate or erect with weak or sympodial branching. Young possess with a closing structure called '' operculum'', which consists of several relatively long triangular folds that meet together in the centre when a disturbed polyp contracts. Because the operculum is quite fragile, hydrothecae of old polyps usually have only a small chitinous collar remaining. Comparatively large cylindrical are attached to the colony with a thin peduncle. Commonly only one medusa develops in each gonotheca. Medusae Mature aequoreid medus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aequoreidae
Aequoreidae is a family of hydrozoans, sometimes called the many-ribbed jellies or many-ribbed jellyfish. There are approximately 30 known species found in temperate and tropical marine coastal environments. Aequoreids include ''Aequorea victoria'', the organism from which the green fluorescent protein gene was isolated. Polyps Only the polyp stages of '' Aequorea'' species have been observed. The colonies are covered with chitinous periderm and can be either prostrate or erect with weak or sympodial branching. Young possess with a closing structure called '' operculum'', which consists of several relatively long triangular folds that meet together in the centre when a disturbed polyp contracts. Because the operculum is quite fragile, hydrothecae of old polyps usually have only a small chitinous collar remaining. Comparatively large cylindrical are attached to the colony with a thin peduncle. Commonly only one medusa develops in each gonotheca. Medusae Mature aequoreid medus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aequorea
''Aequorea'' is a genus of pelagic hydrozoans in the family Aequoreidae. Species The genus contains the following species: *'' Aequorea africana'' Millard, 1966 *'' Aequorea albida'' L. Agassiz, 1862 *'' Aequorea atrikeelis'' Lin, Xu, Huang & Wang, 2009 *'' Aequorea australis'' Uchida, 1947 *'' Aequorea coerulescens'' (Brandt, 1838) *'' Aequorea conica'' Browne, 1905 *'' Aequorea cyanea'' de Blainville, 1834 *'' Aequorea floridana'' Agassiz, 1862 *'' Aequorea forskalea'' Péron & Lesueur, 1810 *''Aequorea globosa'' Eschscholtz, 1829 *'' Aequorea krampi'' Bouillon, 1984 *'' Aequorea kurangai'' Gershwin, Zeidler & Davie, 2010 *'' Aequorea macrodactyla'' Brandt, 1835 *'' Aequorea minima'' Bouillon, 1985 *'' Aequorea nanhainensis'' Xu, Huang & Du, 2009 *'' Aequorea papillata'' Huang & Xu, 1994 *'' Aequorea parva'' Browne, 1905 *'' Aequorea pensilis'' Haeckel, 1879 *'' Aequorea phillipensis'' Watson, 1998 *'' Aequorea taiwanensis'' Zheng, Lin, Li, Cao, Xu & Huang, 2009 *'' Aequorea te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leptothecata
Leptothecata, or thecate hydroids, are an order of hydrozoans in the phylum Cnidaria. Their closest living relatives are the athecate hydroids, which are similar enough to have always been considered closely related, and the very apomorphic Siphonophorae, which were placed outside the "Hydroida". Given that there are no firm rules for synonymy for high-ranked taxa, alternative names like Leptomedusa, Thecaphora or Thecata, with or without the ending emended to "-ae", are also often used for Leptothecata. Leptothecata is surrounded by a chitinous outer layer as its exoskeleton, including gonophores, their reproductive organ. Leptothecata obtain radial symmetry, in which their gonads can be found in their radial canals. Their morphological characters normally have ranged from benthic to planktonic stages. Characters associated with benthic are the polyps and colony forms, while planktonic is medusae. Leptothecata has a vast and complex variation among all species within the hydrozo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhacostoma Atlanticum
''Rhacostoma'' is a genus of aequoreid hydrozoans. It is monotypic with a single species, ''Rhacostoma atlanticum''. It has been reported from the Atlantic coastline of North America, Colombia, western and central Africa. The polyp stage is unknown. Morphology The medusae reach up to in diameter with the bell height 3–4 times less than the width. Specimens found in the northern waters tend to be transparent, while those found farther south are tinted pink. The broad stomach gives rise to 80–100 non-branching radial canals. Tentacle In zoology, a tentacle is a flexible, mobile, and elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or more pairs. Anatomically, the tentacles of animals work main ...s are slightly more numerous than radial canals and do possess elongated conical bulbs. References Aequoreidae Hydrozoan genera Taxa named by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aequorea Tenuis
''Aequorea tenuis'', or the flat jellyfish, is a species of hydrozoan found off the coastline of mainland North America. It reaches only two inches in diameter, with more than eighty fine tentacles. As with several other species of ''Aequorea ''Aequorea'' is a genus of pelagic hydrozoans in the family Aequoreidae. Species The genus contains the following species: *'' Aequorea africana'' Millard, 1966 *'' Aequorea albida'' L. Agassiz, 1862 *'' Aequorea atrikeelis'' Lin, Xu, Huang & W ...'', these jellyfish bioluminesce from the base of their tentacles when disturbed. References *Goodwin, G; Bogert, C M; Gilliard, E; Coates, C W; "The Illustrated Encyclopedia of Animal Life", Odham Books, 1961. Volume 13, p. 1666. Aequoreidae Animals described in 1862 {{Leptothecata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aequorea Victoria
''Aequorea victoria'', also sometimes called the crystal jelly, is a bioluminescent hydrozoan jellyfish, or hydromedusa, that is found off the west coast of North America. The species is best known as the source of two proteins involved in bioluminescence, aequorin, a photoprotein, and green fluorescent protein (GFP). Their discoverers, Osamu Shimomura and colleagues, won the 2008 Nobel Prize in Chemistry for their work on GFP. Description Almost entirely transparent and colorless, and sometimes difficult to resolve, ''Aequorea victoria'' possess a highly contractile mouth and manubrium at the center of up to 100 radial canals that extend to the bell margin. The bell margin is surrounded by uneven tentacles, up to 150 of them in fully-grown specimens. The tentacles possess nematocysts that aid in prey capture, although they have no effect on humans. Specimens larger than 3 cm usually possess gonads for sexual reproduction, which run most of the length of the radial canals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhacostoma
''Rhacostoma'' is a genus of aequoreid hydrozoans. It is monotypic with a single species, ''Rhacostoma atlanticum''. It has been reported from the Atlantic coastline of North America, Colombia, western and central Africa. The polyp stage is unknown. Morphology The medusae reach up to in diameter with the bell height 3–4 times less than the width. Specimens found in the northern waters tend to be transparent, while those found farther south are tinted pink. The broad stomach gives rise to 80–100 non-branching radial canals. Tentacle In zoology, a tentacle is a flexible, mobile, and elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or more pairs. Anatomically, the tentacles of animals work main ...s are slightly more numerous than radial canals and do possess elongated conical bulbs. References Aequoreidae Hydrozoan genera Taxa named by Louis Agassiz Monotypic cnidarian genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrozoan
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] |
Green Fluorescent Protein
The green fluorescent protein (GFP) is a protein that exhibits bright green fluorescence when exposed to light in the blue to ultraviolet range. The label ''GFP'' traditionally refers to the protein first isolated from the jellyfish ''Aequorea victoria'' and is sometimes called ''avGFP''. However, GFPs have been found in other organisms including corals, sea anemones, zoanithids, copepods and lancelets. The GFP from ''A. victoria'' has a major excitation peak at a wavelength of 395 nm and a minor one at 475 nm. Its emission peak is at 509 nm, which is in the lower green portion of the visible spectrum. The fluorescence quantum yield (QY) of GFP is 0.79. The GFP from the sea pansy (''Renilla reniformis'') has a single major excitation peak at 498 nm. GFP makes for an excellent tool in many forms of biology due to its ability to form an internal chromophore without requiring any accessory cofactors, gene products, or enzymes / substrates other than mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyp (zoology)
A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa. Polyps are roughly cylindrical in shape and elongated at the axis of the vase-shaped body. In solitary polyps, the aboral (opposite to oral) end is attached to the substrate by means of a disc-like holdfast called a pedal disc, while in colonies of polyps it is connected to other polyps, either directly or indirectly. The oral end contains the mouth, and is surrounded by a circlet of tentacles. Classes In the class Anthozoa, comprising the sea anemones and corals, the individual is always a polyp; in the class Hydrozoa, however, the individual may be either a polyp or a medusa, with most species undergoing a life cycle with both a polyp stage and a medusa stage. In class Scyphozoa, the medusa stage is dominant, and the polyp stage may or may not be present, depending on the family. In those scyphozoans that have the larval planula metamorphose into a polyp, the polyp, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Friedrich Von Eschscholtz
Johann Friedrich Gustav von Eschscholtz (1 November 1793 – 7 May 1831)Sterling (1997) was a Baltic German physician, naturalist, and entomologist. He was one of the earliest scientific explorers of the Pacific region, making significant collections of flora and fauna in Alaska, California, and Hawaii. Biography Eschscholtz was born in the Livonian city of Dorpat, then part of the Russian Empire. His parents, Johann Gottfried and Katherine Hedwig Ziegler Eschscholtz were ethnic Baltic Germans. He studied medicine and zoology at the University of Dorpat and served as an assistant to Carl Friedrich von Ledebour, a professor of botany.McKelvey Eschscholtz received a medical degree in 1815. First voyage On the recommendation of Ledebour, Eschscholtz served as surgeon and naturalist on the Russian expeditionary ship ''Rurik'' under the command of Otto von Kotzebue.Daum (2019) From 1815 to 1818 the expedition circumnavigated the globe for the purposes of seeking a Northwest Passage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
