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Racekiela Ryderi
''Racekiela ryderi'' is a species of freshwater sponge in the family Spongillidae. It was first described by Edward Potts in 1882. It was collected on Sable Island in 1899 by John Macoun, a biologist with the Geological Survey of Canada, and given the name ''Heteromeyenia macouni'' by A.H. Mackay in 1900. It was originally assumed to be endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ... to Sable Island but is now considered to be the same species as ''Racekiela ryderi'', which is more broadly distributed. References Spongillidae Sable Island Sponges described in 1882 {{Demosponge-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sponge
Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Sponges have unspecialized cells that can transform into other types and that often migrate between the main cell layers and the mesohyl in the process. Sponges do not have nervous, digestive or circulatory systems. Instead, most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes. Sponges were first to branch off the evolutionary tree from the last common ancestor of all animals, making them the sister group of all other animals. Etymology The term ''sponge'' derives from the Ancient Greek word ( 'sponge'). Overview Sponges are similar to other animals in that they are multicellular, he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spongillidae
Spongilidae is a family of sponges that live in freshwater lakes and rivers. The following genera are recognized in the family: * ''Anheteromeyenia'' Schröder, 1927 * ''Corvoheteromeyenia'' Ezcurra de Drago, 1979 * ''Corvospongilla'' Annandale, 1911 * ''Dosilia'' Gray, 1867 * ''Duosclera'' Reiswig & Ricciardi, 1993 * ''Ephydatia'' Lamouroux, 1816 * ''Eunapius (genus), Eunapius'' Gray, 1867 * ''Heteromeyenia'' Potts, 1881 * ''Heterorotula'' Penney & Racek, 1968 * ''Nudospongilla'' Annandale, 1918 * ''Pachyrotula'' Volkmer-Ribeiro & Rützler, 1997 * ''Pectispongilla'' Annandale, 1909 * ''Pottsiela'' Volkmer-Ribeiro, Souza-Machado, Furstenau-Oliveira, Vieira-Soares, 2010 * ''Racekiela'' Bass & Volkmer-Ribeiro, 1998 * ''Radiospongilla'' Penney & Racek, 1968 * ''Sanidastra'' Volkmer-Ribeiro & Watanabe, 1983 * ''Saturnospongilla'' Volkmer-Ribeiro, 1976 * ''Spongilla'' Lamarck, 1816 * ''Stratospongilla'' Annandale, 1909 * ''Trochospongilla'' Vejdovsky, 1888 * ''Umborotula'' Penney & Rac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Potts (biologist) (1861–1947), American historian, and historical and economic writer
{{human name disambiguation, Potts, Edward ...
Edward Potts may refer to: * Edward Potts (gymnast) (1881–1944), British Olympic gymnast * Edward Potts (architect) (1839–1909), English architect * Edward Potts Cheyney Edward Potts Cheyney, A.M., LL.D. (1861–1947) was an American historical and economic writer, born at Wallingford, Pennsylvania. He graduated from the University of Pennsylvania in 1883. He visited German universities and studied at the British ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sable Island
Sable Island (french: île de Sable, literally "island of sand") is a small Canadian island situated southeast of Halifax, Nova Scotia, and about southeast of the closest point of mainland Nova Scotia in the North Atlantic Ocean. The island is staffed year round by three federal government staff, rising during summer months when research projects and tourism increase. Notable for its role in early Canadian history and the Sable Island horse, the island is protected and managed by Parks Canada, which must grant permission prior to any visit. Sable Island is part of District 7 of the Halifax Regional Municipality in Nova Scotia. The island is also a protected National Park Reserve and an Important Bird Area. History Early history The expedition of Portuguese explorer João Álvares Fagundes explored this region in 1520–1521 and they were among the first Europeans to encounter the island. It is likely that he named the island "Fagunda" after himself. An island called ''Fag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Macoun
John Macoun (17 April 1831 – 18 June 1920) was an Irish-born Canadian naturalist. Early life Macoun was born in Magheralin, County Down, Ireland in 1831, the third child of James Macoun and Anne Jane Nevin. In 1850, the worsening economic situation in Ireland led his family to emigrate to Canada, where he settled in Seymour Township, Ontario and began farming. Unsatisfied as a farmer, he became a school teacher in 1856. It was during this time that he developed a nearly obsessive interest in botany. Although his formal education was slight, his knowledge and dedication to field work became sufficiently advanced that he gained the notice and respect of several professional botanists. By 1860 he was teaching school in Belleville, and had established correspondence with botanists such as Asa Gray, Sir William Jackson Hooker, George Lawson, and Louis-Ovide Brunet. This allowed him in 1868 to secure a faculty position as a Professor of Botany and Geology at Alber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Survey Of Canada
The Geological Survey of Canada (GSC; french: Commission géologique du Canada (CGC)) is a Canadian federal government agency responsible for performing geological surveys of the country, developing Canada's natural resources and protecting the environment. A branch of the Earth Sciences Sector of Natural Resources Canada, the GSC is the country's oldest scientific agency and was one of its first government organizations. History In September 1841, the Province of Canada legislature passed a resolution that authorized the sum of £1,500 sterling be granted to the government for the estimated expense of performing a geological survey of the province. In 1842, the Geological Survey of Canada was formed to fulfill this request.Christy Vodden (1992)No Stone Unturned: The First 150 years of the Geological Survey of Canada Geological Survey of Canada Web site William Edmond Logan was in Montreal at the time and made it known that he was interested in participating in this survey. G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can be also be referred to as an ''endemism'' or in scientific literature as an ''endemite''. For example '' Cytisus aeolicus'' is an endemite of the Italian flora. '' Adzharia renschi'' was once believed to be an endemite of the Caucasus, but it was later discovered to be a non-indigenous species from South America belonging to a different genus. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range. A rare alternative term for a species that is endemic is "precinctive", which applies to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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