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Nectonema
''Nectonema'' is a genus of marine horsehair worms first described by Addison E. Verrill in 1879. It is the only genus in the family Nectonematidae described by Henry B. Ward in 1892, in the order Nectonematoidea, and in the class Nectonematoida. The genus contains five species; all species have a parasitic larval stage inhabiting crustacean hosts and a free-living adult stage that swims in open water. Taxonomy Nectonematoidea is one of two orders within the phylum Nematomorpha, the other being Gordioidea. The latter is likewise in a single class Gordioida, which is a significantly larger taxon, with over 300 known species. Nematomorpha are known as horsehair worms or Gordian worms, and form a sister-group to the nematodes. The following classification shows the place of Nectonematoida within the protostomes according to Minelli (2008) and Tedersoo (2017): Within Nectonematoida only a single genus, ''Nectonema'', is known, with five species so far described: * '' Nectone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nectonema Agile
''Nectonema'' is a genus of marine horsehair worms first described by Addison E. Verrill in 1879. It is the only genus in the family Nectonematidae described by Henry B. Ward in 1892, in the order Nectonematoidea, and in the class Nectonematoida. The genus contains five species; all species have a parasitic larval stage inhabiting crustacean hosts and a free-living adult stage that swims in open water. Taxonomy Nectonematoidea is one of two orders within the phylum Nematomorpha, the other being Gordioidea. The latter is likewise in a single class Gordioida, which is a significantly larger taxon, with over 300 known species. Nematomorpha are known as horsehair worms or Gordian worms, and form a sister-group to the nematodes. The following classification shows the place of Nectonematoida within the protostomes according to Minelli (2008) and Tedersoo (2017): Within Nectonematoida only a single genus, ''Nectonema'', is known, with five species so far described: * '' Nectone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nectonema Melanocephalum
''Nectonema'' is a genus of marine horsehair worms first described by Addison E. Verrill in 1879. It is the only genus in the family Nectonematidae described by Henry B. Ward in 1892, in the order Nectonematoidea, and in the class Nectonematoida. The genus contains five species; all species have a parasitic larval stage inhabiting crustacean hosts and a free-living adult stage that swims in open water. Taxonomy Nectonematoidea is one of two orders within the phylum Nematomorpha, the other being Gordioidea. The latter is likewise in a single class Gordioida, which is a significantly larger taxon, with over 300 known species. Nematomorpha are known as horsehair worms or Gordian worms, and form a sister-group to the nematodes. The following classification shows the place of Nectonematoida within the protostomes according to Minelli (2008) and Tedersoo (2017): Within Nectonematoida only a single genus, ''Nectonema'', is known, with five species so far described: * '' Nectone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nectonema Munidae
''Nectonema'' is a genus of marine horsehair worms first described by Addison E. Verrill in 1879. It is the only genus in the family Nectonematidae described by Henry B. Ward in 1892, in the order Nectonematoidea, and in the class Nectonematoida. The genus contains five species; all species have a parasitic larval stage inhabiting crustacean hosts and a free-living adult stage that swims in open water. Taxonomy Nectonematoidea is one of two orders within the phylum Nematomorpha, the other being Gordioidea. The latter is likewise in a single class Gordioida, which is a significantly larger taxon, with over 300 known species. Nematomorpha are known as horsehair worms or Gordian worms, and form a sister-group to the nematodes. The following classification shows the place of Nectonematoida within the protostomes according to Minelli (2008) and Tedersoo (2017): Within Nectonematoida only a single genus, ''Nectonema'', is known, with five species so far described: * '' Necton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nectonema Svensksundi
''Nectonema'' is a genus of marine horsehair worms first described by Addison E. Verrill in 1879. It is the only genus in the family Nectonematidae described by Henry B. Ward in 1892, in the order Nectonematoidea, and in the class Nectonematoida. The genus contains five species; all species have a parasitic larval stage inhabiting crustacean hosts and a free-living adult stage that swims in open water. Taxonomy Nectonematoidea is one of two orders within the phylum Nematomorpha, the other being Gordioidea. The latter is likewise in a single class Gordioida, which is a significantly larger taxon, with over 300 known species. Nematomorpha are known as horsehair worms or Gordian worms, and form a sister-group to the nematodes. The following classification shows the place of Nectonematoida within the protostomes according to Minelli (2008) and Tedersoo (2017): Within Nectonematoida only a single genus, ''Nectonema'', is known, with five species so far described: * '' Necton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nectonema Zealandica
''Nectonema'' is a genus of marine horsehair worms first described by Addison E. Verrill in 1879. It is the only genus in the family Nectonematidae described by Henry B. Ward in 1892, in the order Nectonematoidea, and in the class Nectonematoida. The genus contains five species; all species have a parasitic larval stage inhabiting crustacean hosts and a free-living adult stage that swims in open water. Taxonomy Nectonematoidea is one of two orders within the phylum Nematomorpha, the other being Gordioidea. The latter is likewise in a single class Gordioida, which is a significantly larger taxon, with over 300 known species. Nematomorpha are known as horsehair worms or Gordian worms, and form a sister-group to the nematodes. The following classification shows the place of Nectonematoida within the protostomes according to Minelli (2008) and Tedersoo (2017): Within Nectonematoida only a single genus, ''Nectonema'', is known, with five species so far described: * ''Necto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematomorpha
Nematomorpha (sometimes called Gordiacea, and commonly known as horsehair worms, hairsnakes, or Gordian worms) are a phylum of parasitoid animals superficially similar to nematode worms in morphology, hence the name. Most species range in size from long, reaching 2 metres in extreme cases, and in diameter. Horsehair worms can be discovered in damp areas, such as watering troughs, swimming pools, streams, puddles, and cisterns. The adult worms are free-living, but the larvae are parasitic on arthropods, such as beetles, cockroaches, mantises, orthopterans, and crustaceans. About 351 freshwater species are known and a conservative estimate suggests that there may be about 2000 freshwater species worldwide. The name "Gordian" stems from the legendary Gordian knot. This relates to the fact that nematomorphs often coil themselves in tight balls that resemble knots. Description and biology Nematomorphs possess an external cuticle without cilia. Internally, they have only lon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gordioidea
Gordioidea is an order (sometimes placed at superfamily level) of parasitic horsehair worms. Its taxonomy remains uncertain, but appears to be contained in the monotypic class Gordioida and contains about 320 known species. Biology Gordioidean adults are free-living in freshwater or semi-terrestrial habitats and larvae parasitise insects, primarily Orthopterans. Unlike Nectonematoideans, which are marine, gordioideans lack lateral rows of setae and have a single, ventral epidermal cord and their blastocoel is filled with mesenchyme in young worms but become open when older.Pechenik (2010) ''Biology of the Invertebrates'', p. 457. Families and genera The Integrated Taxonomic Information System lists the following genera in two families: Chordodidae Auth. May, 1919; selected genera: ;Subfamily Chordodinae Heinze, 1935 * ''Chordodes'' Creplin, 1847 * ''Dacochordodes'' Capuse, 1965 * '' Euchordodes'' Heinze, 1937 * '' Neochordodes'' Carvalho, 1942 * '' Pantachordodes'' Heinze, 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gordioida
Gordioidea is an order (sometimes placed at superfamily level) of parasitic horsehair worms. Its taxonomy remains uncertain, but appears to be contained in the monotypic class Gordioida and contains about 320 known species. Biology Gordioidean adults are free-living in freshwater or semi-terrestrial habitats and larvae parasitise insects, primarily Orthopterans. Unlike Nectonematoideans, which are marine, gordioideans lack lateral rows of setae and have a single, ventral epidermal cord and their blastocoel is filled with mesenchyme in young worms but become open when older.Pechenik (2010) ''Biology of the Invertebrates'', p. 457. Families and genera The Integrated Taxonomic Information System lists the following genera in two families: Chordodidae Auth. May, 1919; selected genera: ;Subfamily Chordodinae Heinze, 1935 * ''Chordodes'' Creplin, 1847 * ''Dacochordodes'' Capuse, 1965 * '' Euchordodes'' Heinze, 1937 * '' Neochordodes'' Carvalho, 1942 * '' Pantachordodes'' Heinze, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth#Surface, Earth's surface and about 29% of its water surface area. It is known to separate the "Old World" of Africa, Europe and Asia from the "New World" of the Americas in the European perception of Earth, the World. The Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Europe and Africa to the east, and North America, North and South America to the west. As one component of the interconnected World Ocean, it is connected in the north to the Arctic Ocean, to the Pacific Ocean in the southwest, the Indian Ocean in the southeast, and the Southern Ocean in the south (other definitions describe the Atlantic as extending southward to Antarctica). The Atlantic Ocean is divided in two parts, by the Equatorial Counter Current, with the North(ern) Atlantic Ocean and the South(ern) Atlantic Ocean split at about 8th paralle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Baldwin Ward
Henry Baldwin Ward (4 March 1865 – 30 November 1945) was an American zoologist and parasitologist. He was the founder and first president of The American Society of Parasitologists, and founder-editor of the ''Journal of Parasitology.'' Biography Ward was born on March 4, 1865, in Troy, New York. His father, Richard Halsted Ward, was a professor of biology at the Rensselaer Polytechnic Institute. He got his bachelor's degree from Williams College of Williamstown, Massachusetts, in 1885. He became an instructor of Science at Troy High School, where he served from 1886 to 1888. For two years, from 1888 to 1980, he participated in postgraduate study in European universities in cities like Göttingen, Freiburg, and Leipzig, and in biological facilities at Naples, Heligoland, and Villefranche-sur-Mer. He got his Ph.D. from Harvard University in 1892. He accepted a job as Instructor of Morphology at the University of Michigan in 1892. Next year, he got a job as an Associate Prof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mediterranean Sea
The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on the east by the Levant. The Sea has played a central role in the history of Western civilization. Geological evidence indicates that around 5.9 million years ago, the Mediterranean was cut off from the Atlantic and was partly or completely desiccated over a period of some 600,000 years during the Messinian salinity crisis before being refilled by the Zanclean flood about 5.3 million years ago. The Mediterranean Sea covers an area of about , representing 0.7% of the global ocean surface, but its connection to the Atlantic via the Strait of Gibraltar—the narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates the Iberian Peninsula in Europe from Morocco in Africa—is only wide. The Mediterranean ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Sea
The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. The Black Sea is supplied by major rivers, principally the Danube, Dnieper, and Don. Consequently, while six countries have a coastline on the sea, its drainage basin includes parts of 24 countries in Europe. The Black Sea covers (not including the Sea of Azov), has a maximum depth of , and a volume of . Most of its coasts ascend rapidly. These rises are the Pontic Mountains to the south, bar the southwest-facing peninsulas, the Caucasus Mountains to the east, and the Crimean Mountains to the mid-north. In the west, the coast is generally small floodplains below foothills such as the Strandzha; Cape Emine, a dwindling of the east end of the Balkan Mountains; and the Dobruja Plateau considerably ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
