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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] |
Alexander Emanuel Agassiz
Alexander Emmanuel Rodolphe Agassiz (December 17, 1835March 27, 1910), son of Louis Agassiz and stepson of Elizabeth Cabot Agassiz, was an American scientist and engineer. Biography Agassiz was born in Neuchâtel, Switzerland and immigrated to the United States with his parents, Louis and Cecile (Braun) Agassiz, in 1846. He graduated from Harvard University in 1855, subsequently studying engineering and chemistry, and taking the degree of Bachelor of Science at the Lawrence Scientific School of the same institution in 1857; in 1859 became an assistant in the United States Coast Survey. Thenceforward he became a specialist in marine ichthyology. Agassiz was elected a Fellow of the American Academy of Arts and Sciences in 1862. Up until the summer of 1866, Agassiz worked as assistant curator in the museum of natural history that his father founded at Harvard. E. J. Hulbert, a friend of Agassiz's brother-in-law, Quincy Adams Shaw, had discovered a rich copper lode known as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrozoa
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 polyp (zoology), polypoid and a medusa (biology), 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 tetraphylla, Lir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 mainly like muscular hydrostats. Most forms of tentacles are used for grasping and feeding. Many are sensory organs, variously receptive to touch, vision, or to the smell or taste of particular foods or threats. Examples of such tentacles are the eyestalks of various kinds of snails. Some kinds of tentacles have both sensory and manipulatory functions. A tentacle is similar to a cirrus, but a cirrus is an organ that usually lacks the tentacle's strength, size, flexibility, or sensitivity. A nautilus has cirri, but a squid has tentacles. Invertebrates Molluscs Many molluscs have tentacles of one form or another. The most familiar are those of the pulmonate land snails, which usually have two sets of tentacles on the head: when extended ... [...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] |
Bioluminescence
Bioluminescence is the production and emission of light by living organisms. It is a form of chemiluminescence. Bioluminescence occurs widely in marine vertebrates and invertebrates, as well as in some fungi, microorganisms including some bioluminescent bacteria, and terrestrial arthropods such as fireflies. In some animals, the light is bacteriogenic, produced by symbiotic bacteria such as those from the genus ''Vibrio''; in others, it is autogenic, produced by the animals themselves. In a general sense, the principal chemical reaction in bioluminescence involves a light-emitting molecule and an enzyme, generally called luciferin and luciferase, respectively. Because these are generic names, luciferins and luciferases are often distinguished by the species or group, e.g. firefly luciferin. In all characterized cases, the enzyme catalyzes the oxidation of the luciferin. In some species, the luciferase requires other cofactors, such as calcium or magnesium ions, and somet ... [...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] |
