Prostoma Eilhardi
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Prostoma Eilhardi
''Prostoma eilhardi'' is a species of ribbon worm. This species uses ciliary gliding to get from place to place. It is closely related to Prostoma graecense ''Prostoma graecense'' is a species of Nemertea in the family Prostomatidae. It was once called ''Emea rubrum''. It is closely related to ''Prostoma eilhardi''. The species is distributed all across the world. Characteristics Individuals in t .... The species has been classified as androdioecious. The species has been reported to have a distribution across the world but not all reports may be authentic. References Monostilifera {{Improve categories, date=May 2022 ...
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Ribbon Worm
Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of 1300 known species. Most ribbon worms are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies. Many have patterns of yellow, orange, red and green coloration. The foregut, stomach and intestine run a little below the midline of the body, the anus is at the tip of the tail, and the mouth is under the front. A little above the gut is the rhynchocoel, a cavity which mostly runs above the midline and ends a little short of the rear of the body. All species have a proboscis which lies in the rhynchocoel when inactive but wikt:eversion, everts to emerge just above the mouth to capture the animal's prey with venom. A highly extensible muscle in the back of the rhynchocoel pulls the proboscis in when an attack ends. A few species with stubby bodies Filter feeders, filter feed and have suckers at the front and back ends, with which they attach to ...
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Encyclopedia Of Life
The ''Encyclopedia of Life'' (''EOL'') is a free, online encyclopedia intended to document all of the 1.9 million living species known to science. It is compiled from existing trusted databases curated by experts and with the assistance of non-experts throughout the world. It aims to build one "infinitely expandable" page for each species, including video, sound, images, graphics, as well as text. In addition, the Encyclopedia incorporates content from the Biodiversity Heritage Library, which digitizes millions of pages of printed literature from the world's major natural history libraries. The project was initially backed by a US$50 million funding commitment, led by the MacArthur Foundation and the Sloan Foundation, who provided US$20 million and US$5 million, respectively. The additional US$25 million came from five cornerstone institutions—the Field Museum, Harvard University, the Marine Biological Laboratory, the Missouri Botanical Garden, and the Smithsonian Institutio ...
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Prostoma Graecense
''Prostoma graecense'' is a species of Nemertea in the family Prostomatidae. It was once called ''Emea rubrum''. It is closely related to ''Prostoma eilhardi''. The species is distributed all across the world. Characteristics Individuals in this species can reach up to a length of 5 cm. It is Hermaphrodite, hermaphroditic and has 2 or 3 pairs of eyes. Occurrence It is distributed all across the world. However the authenticity of this is hard to tell. It has been reported in the continents of Europe, Africa, Asia, South America, Australia, and North America. It has been reported in Japan, Russia, New Zealand, Kenya, Venezuela, Argentina, and Mexico. Genetic evidence indicates this species was introduced by Human, humans. It is the only known species of fresh water Nemertea in Australia. It is rarely found in the United States. But in the state of Connecticut it lives in freshwater habitats. Here it usually lives among algae, plants, or detritus. It is more numerous during ...
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Androdioecy
Androdioecy is a reproductive system characterized by the coexistence of males and hermaphrodites. Androdioecy is rare in comparison with the other major reproductive systems: dioecy, gynodioecy and hermaphroditism. In animals, androdioecy has been considered a stepping stone in the transition from dioecy to hermaphroditism, and vice versa. Androdioecy is sometimes referred to as a mixed breeding system with trioecy and gynodioecy. It is a dimorphic sexual system in plants alongside gynodioecy and dioecy. Evolution of androdioecy The fitness requirements for androdioecy to arise and sustain itself are theoretically so improbable that it was long considered that such systems do not exist. Particularly, males and hermaphrodites have to have the same fitness, in other words the same number of offspring, in order to be maintained. However, males only have offspring by fertilizing eggs or ovules of hermaphrodites, while hermaphrodites have offspring both through fertilizing eggs or ...
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