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Acanthogonatus Huaquen
''Acanthogonatus huaquen'' is a mygalomorph spider of Chile, its name referring to its type locality: Huaquén, Chile.Goloboff, Pablo A. "A revision of the South American spiders of the family Nemesiidae (Araneae, Mygalomorphae). Part 1, Species from Peru, Chile, Argentina, and Uruguay. Bulletin of the AMNH; no. 224." (1995). Males are recognized from other two-clawed ''Acanthogonatus'' by the bulb with a lateral keel delimiting a concave area; females by the spermathecae with an almost conical basal mound and its duct arising from its tip (similar spermathecae occur in '' A. franki''). Description *Female: total length ; cephalothorax length , width ; cephalic region length , width ; fovea width ; medial ocular quadrangle (OQ) length , width ; labium length , width ; sternum length , width . Its cephalic region is convex. Its labium possesses 2 cuspules. A well-developed serrula is present. Its sternal sigilla is submarginal and long, and its sternum is weakly rebordered. Che ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mygalomorphae
The Mygalomorphae, or mygalomorphs, are an infraorder of spiders, and comprise one of three major groups of living spiders with over 3000 species, found on all continents except Antarctica. Many members are known as trapdoor spiders due to them forming trapdoors over their burrows. Other prominent groups include Australian funnel web spiders and tarantulas, with the latter accounting for around one third of all mygalomorphs. Description This group of spiders comprises mostly heavy-bodied, stout-legged spiders including tarantulas, Australian funnel-web spiders, mouse spiders, and various families of spiders commonly called trapdoor spiders. Like the " primitive" suborder of spiders Mesothelae, they have two pairs of book lungs, and downward-pointing chelicerae. Because of this, the two groups were once believed to be closely related. Later it was realized that the common ancestors of all spiders had these features (a state known as symplesiomorphy). Following the branching ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthogonatus Campanae
''Acanthogonatus'' is a genus of South American mygalomorph spiders in the family Pycnothelidae. It was first described by Ferdinand Anton Franz Karsch in 1880. Originally placed with the brushed trapdoor spiders, it was transferred to the funnel-web trapdoor spiders in 1985, then to the Pycnothelidae in 2020. Species it contains twenty-nine species, found in Uruguay, Peru, Brazil, Argentina, and Chile: *'' Acanthogonatus alegre'' Goloboff, 1995 – Chile *'' Acanthogonatus birabeni'' Goloboff, 1995 – Argentina *''Acanthogonatus brunneus'' (Nicolet, 1849) – Chile *'' Acanthogonatus campanae'' (Legendre & Calderón, 1984) – Chile *'' Acanthogonatus centralis'' Goloboff, 1995 – Argentina *'' Acanthogonatus chilechico'' Goloboff, 1995 – Chile *''Acanthogonatus confusus'' Goloboff, 1995 – Chile, Argentina *''Acanthogonatus ericae'' Indicatti, Lucas, Ott & Brescovit, 2008 – Brazil *''Acanthogonatus francki'' Karsch, 1880 (type) – Chile *''Acanthogonatus fuegianus'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiders Of South America
Spiders ( order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every land habitat. , 50,356 spider species in 132 families have been recorded by taxonomists. However, there has been debate among scientists about how families should be classified, with over 20 different classifications proposed since 1900. Anatomically, spiders (as with all arachnids) differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax or prosoma, and the opisthosoma, or abdomen, and joined by a small, cylindrical pedicel, however, as there is currently neither paleontological nor embryological evidence that spiders ever had a separate t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pycnothelidae
''Pycnothelidae'' is a family of mygalomorph spiders first described in 1917. It was downgraded to a subfamily of the funnel-web trapdoor spiders in 1985, but returned to family status in 2020. Genera , the World Spider Catalog accepted the following genera: *'' Acanthogonatus'' Karsch, 1880 – South America *''Bayana'' Pérez-Miles, Costa & Montes de Oca, 2014 *''Pionothele ''Pionothele'' is a genus of African mygalomorph spiders in the family Pycnothelidae. It was first described by William Frederick Purcell in 1902. it contains 2 species, found in Namibia and South Africa: '' P. gobabeb'', and '' P. straminea''. ...'' Purcell, 1902 – South Africa, Namibia *'' Pycnothele'' Chamberlin, 1917 – Uruguay, Brazil, Argentina *'' Stanwellia'' Rainbow & Pulleine, 1918 – Australia, New Zealand *'' Stenoterommata'' Holmberg, 1881 – Brazil, Uruguay, Argentina References Mygalomorphae families {{Mygalomorphae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grassland
A grassland is an area where the vegetation is dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur naturally on all continents except Antarctica and are found in most ecoregions of the Earth. Furthermore, grasslands are one of the largest biomes on earth and dominate the landscape worldwide. There are different types of grasslands: natural grasslands, semi-natural grasslands, and agricultural grasslands. They cover 31–69% of the Earth's land area. Definitions Included among the variety of definitions for grasslands are: * "...any plant community, including harvested forages, in which grasses and/or legumes make up the dominant vegetation." * "...terrestrial ecosystems dominated by herbaceous and shrub vegetation, and maintained by fire, grazing, drought and/or freezing temperatures." (Pilot Assessment of Global Ecosystems, 2000) * "A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silk
Silk is a natural protein fiber, some forms of which can be woven into textiles. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm ''Bombyx mori'' reared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism-like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colors. Silk is produced by several insects; but, generally, only the silk of moth caterpillars has been used for textile manufacturing. There has been some research into other types of silk, which differ at the molecular level. Silk is mainly produced by the larvae of insects undergoing complete metamorphosis, but some insects, such as webspinners and raspy crickets, produce silk throughout their lives. Silk production also occurs in hymenoptera ( bee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthogonatus Quilocura
''Acanthogonatus quilocura'' is a mygalomorph spider of Chile, its name referring to the seemingly unending number of species within this genus (“locura” meaning ''madness'' in Spanish).Goloboff, Pablo A. "A revision of the South American spiders of the family Nemesiidae (Araneae, Mygalomorphae). Part 1, Species from Peru, Chile, Argentina, and Uruguay. Bulletin of the AMNH; no. 224." (1995). Males are similar to those of '' A. tacuariensis'' (from Uruguay), from which are distinguished by a curved metatarsus I; female spermathecae are characteristic in having a strongly bent duct arising from the base of a blunt basal dome. Description *Female: total length ; cephalothorax length , width ; cephalic region length , width ; fovea width ; medial ocular quadrangle (OQ) length , width ; labium length , width ; sternum length , width . Its cephalic region is convex, with its fovea slightly procurved, with a small posterior notch. Its labium possesses 3 cuspules. A well-develop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santiago Metropolitan Region
Santiago Metropolitan Region ( es, link=no, Región Metropolitana de Santiago) is one of Chile's 16 first-order administrative divisions. It is the country's only landlocked administrative region and contains the nation's capital, Santiago. Most commercial and administrative centers are located in the region, including Chile's main international airport, Arturo Merino Benítez International Airport. With an area of and population over 7 million, it is Chile's most populated and most densely populated region. History The region's history of European influence started in 1542, a few days after Santiago was founded. When the Santiago cabildo was built, its function was to supervise the entire territory. Later, with the creation of the cities of La Serena and Concepción and the creation of their respective cabildos, its territorial reach was reduced. On 30 August 1826, 8 provinces were created, with the Santiago Province being one of them, but it wasn't until 1980 that the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valparaíso Region
The Valparaíso Region ( es, Región de Valparaíso, links=no, ) is one of Chile's 16 first order administrative divisions.Valparaíso Region, 2006 With the country's second-highest population of 1,790,219 , and fourth-smallest area of , the region is Chile's second most densely populated after the Santiago Metropolitan Region to the southeast. The region also includes the remote Easter Island (Rapa Nui) in the Pacific Ocean. Its capital is the port city of Valparaíso; other important cities include Viña del Mar, Quillota, San Felipe, Quilpué, Villa Alemana, and San Antonio. Administration As a region, Valparaíso is a first-level administrative division. Since 2021 the region is governed by the governor, who is elected by popular vote. The current governor is Rodrigo Mundaca ( Broad Font). Geography and natural features The region is on the same latitude as the Santiago Metropolitan Region. Its capital is Valparaíso, which is the site for the National Congre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coquimbo Region
The Coquimbo Region ( es, Región de Coquimbo, ) is one of Chile's 16 regions (first order administrative divisions). It is bordered by Atacama to the north, Valparaíso to the south, Argentina to the east, and the Pacific Ocean to the west. It is approximately north of the national capital, Santiago. The capital and largest city is La Serena. Other important cities include the seaport Coquimbo and the agricultural centre Ovalle. Geography and ecology The Coquimbo Region forms the narrowest part, or 'waist' of Chile, and is hence one of the country's more mountainous regions, as the Andes range runs closer to the sea than elsewhere. The region has notable marine species as well as taxa that are associated with the mountainous regions. With respect to marine organisms, the upwelling areas encourage bioproductivity off of this Pacific Coast area of Chile. In the southern mountainous areas of the Coquimbo Region, the rare and endangered Chilean Wine Palm is found, whose ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acanthogonatus Pissii
''Acanthogonatus'' is a genus of South American mygalomorph spiders in the family Pycnothelidae. It was first described by Ferdinand Anton Franz Karsch in 1880. Originally placed with the brushed trapdoor spiders, it was transferred to the funnel-web trapdoor spiders in 1985, then to the Pycnothelidae in 2020. Species it contains twenty-nine species, found in Uruguay, Peru, Brazil, Argentina, and Chile: *'' Acanthogonatus alegre'' Goloboff, 1995 – Chile *'' Acanthogonatus birabeni'' Goloboff, 1995 – Argentina *''Acanthogonatus brunneus'' (Nicolet, 1849) – Chile *'' Acanthogonatus campanae'' (Legendre & Calderón, 1984) – Chile *'' Acanthogonatus centralis'' Goloboff, 1995 – Argentina *'' Acanthogonatus chilechico'' Goloboff, 1995 – Chile *''Acanthogonatus confusus'' Goloboff, 1995 – Chile, Argentina *''Acanthogonatus ericae'' Indicatti, Lucas, Ott & Brescovit, 2008 – Brazil *''Acanthogonatus francki'' Karsch, 1880 (type) – Chile *''Acanthogonatus fuegianus'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pubescence
Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads: the ovaries in a girl, the testes in a boy. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sex organs. Physical growth—height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed. Before puberty, the external sex organs, known as primary sexual characteristics, are sex characteristics that distinguish boys and girls. Puberty leads to sexual dimorphism through the development of the secondary sex characteristics, which further distinguish the sexes. On average, girls begin puberty at ages 10–11 and complete puberty at ages 15–17; boys generally begin puberty at ages 11–12 and complete p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
