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Hemirrhagus Cervinus
''Hemirrhagus'' is a genus of Mexican tarantulas that was first described by Eugène Louis Simon in 1903. It is considered a senior synonym of ''Spelopelma''. Species of the genus ''Hemirrhagus'' are 5 to 12 cm long, usually black in colour, the urticating hairs on the opisthosoma are arranged in one dorsomedian patch, two dorsal paramedian patches, or two lateral patches. It is unique amongst the theraphosine genera because of the retrolateral coxal heels, the shape of the male palpal bulb, and the urticating hairs on the abdomen are reduced or completely missing. It is the only genus with epigean, troglophile and troglobitic species. Distribution Hemirrhagus tarantulas are all found in Mexico all of them are largely distributed from Tamaulipas in the north to Chiapas in the south, primarily in the mountainous regions of Sierra Madre Oriental, Eje Volcánico Transversal, Sierra Norte de Oaxaca, and Sierra Madre Sur. All of this tarantulas are found in individual caves, some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eugène Simon
Eugène Louis Simon (; 30 April 1848 – 17 November 1924) was a French naturalist who worked particularly on insects and spiders, but also on birds and plants. He is by far the most prolific spider taxonomist in history, describing over 4,000 species. Work on spiders His most significant work was ''Histoire Naturelle des Araignées'' (1892–1903), an encyclopedic treatment of the spider genera of the world. It was published in two volumes of more than 1000 pages each, and the same number of drawings by Simon. Working at the Muséum National d'Histoire Naturelle in Paris, it took Simon 11 years to complete, while working at the same time on devising a taxonomic scheme that embraced the known taxa. Simon described a total of 4,650 species, and as of 2013 about 3,790 species are still considered valid. The International Society of Arachnology offers a Simon Award recognising lifetime achievement. The Eocene fossil spider species '' Cenotextricella simoni'' was named in his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trans-Mexican Volcanic Belt
The Trans-Mexican Volcanic Belt ( es, Eje Volcánico Transversal), also known as the Transvolcanic Belt and locally as the (''Snowy Mountain Range''), is an active volcanic belt that covers central-southern Mexico. Several of its highest peaks have snow all year long, and during clear weather, they are visible to a large percentage of those who live on the many high plateaus from which these volcanoes rise. History The Trans-Mexican Volcanic Belt spans across Central-Southern Mexico from the Pacific Ocean to the Gulf of Mexico between 18°30'N and 21°30'N, resting on the southern edge of the North American Plate. This approximately 1000 kilometer long, 90–230 km broad structure is an east–west, active, continental volcanic arc; encompassing an area of approximately 160,000 km2. Over several million years, the subduction of the Rivera and Cocos plates beneath the North American Plate along the northern end of the Middle America Trench formed the Trans-Mexican Vol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemirrhagus Diablo
''Hemirrhagus diablo'' is a tarantula in the ''Hemirrhagus'' genus, it is found in Mexico, in several caves in the state of Morelos. It is named after a cave it is found in, "Cueva del diablo" which translated to "Devil's cave", diablo being devil. This tarantula was first described by Mendoza & Francke in 2018. Description ''Hemirrhagus diablo'' can be distinguished from most other ''Hemirrhagus'' tarantulas by having the urticating hairs arranged in two para median patches, which are brown in color. And by the shape of the male palpal bulb with a narrow base. The tarantula is dark brown in color with either some darker or whiter patches. Spiderlings are dark brown in color with some orange coloration in the para median patches. Habitat This tarantula is found in "Cueva del diablo", it is named as such after a legend. The cave is about 2 km long, in some of the deeper areas it is necessary to bring equipment to breath, as there is a lack of oxygen. In this cave several ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemirrhagus Coztic
''Hemirrhagus'' is a genus of Mexican tarantulas that was first described by Eugène Louis Simon in 1903. It is considered a senior synonym of ''Spelopelma''. Species of the genus ''Hemirrhagus'' are 5 to 12 cm long, usually black in colour, the urticating hairs on the opisthosoma are arranged in one dorsomedian patch, two dorsal paramedian patches, or two lateral patches. It is unique amongst the theraphosine genera because of the retrolateral coxal heels, the shape of the male palpal bulb, and the urticating hairs on the abdomen are reduced or completely missing. It is the only genus with epigean, troglophile and troglobitic species. Distribution Hemirrhagus tarantulas are all found in Mexico all of them are largely distributed from Tamaulipas in the north to Chiapas in the south, primarily in the mountainous regions of Sierra Madre Oriental, Eje Volcánico Transversal, Sierra Norte de Oaxaca, and Sierra Madre Sur. All of this tarantulas are found in individual caves, some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemirrhagus Chilango
''Hemirrhagus'' is a genus of Mexican tarantulas that was first described by Eugène Louis Simon in 1903. It is considered a senior synonym of ''Spelopelma''. Species of the genus ''Hemirrhagus'' are 5 to 12 cm long, usually black in colour, the urticating hairs on the opisthosoma are arranged in one dorsomedian patch, two dorsal paramedian patches, or two lateral patches. It is unique amongst the theraphosine genera because of the retrolateral coxal heels, the shape of the male palpal bulb, and the urticating hairs on the abdomen are reduced or completely missing. It is the only genus with epigean, troglophile and troglobitic species. Distribution Hemirrhagus tarantulas are all found in Mexico all of them are largely distributed from Tamaulipas in the north to Chiapas in the south, primarily in the mountainous regions of Sierra Madre Oriental, Eje Volcánico Transversal, Sierra Norte de Oaxaca, and Sierra Madre Sur. All of this tarantulas are found in individual caves, some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type Species
In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen(s). Article 67.1 A similar concept is used for suprageneric groups and called a type genus. In botanical nomenclature, these terms have no formal standing under the code of nomenclature, but are sometimes borrowed from zoological nomenclature. In botany, the type of a genus name is a specimen (or, rarely, an illustration) which is also the type of a species name. The species name that has that type can also be referred to as the type of the genus name. Names of genus and family ranks, the various subdivisions of those ranks, and some higher-rank names based on genus names, have such types. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemirrhagus Billsteelei
''Hemirrhagus billsteelei'' is a tarantula in the ''Hemirrhagus'' genus of Mexican cave tarantulas. This tarantula is found in the Mexican state of Oaxaca. This tarantula was first described by Mendoza and Francke in 2018, and is named in honour of Bill Steele, because of his contributions of knowledge in Mexican caves. Description This tarantula is purely black in colour, with some grey tones. It has a slender body, as it is advantageous for traversing through crevices. It can be distinguished from all other Hemirrhagus species, with the exception of ''Hemirrhagus perezmiles'', in that it lacks tibial apophyses. It can be distinguished from the ''Hemirrhagus perezmiles'' as the shape of male palpal bulb The two palpal bulbs – also known as palpal organs and genital bulbs – are the copulatory organs of a male spider. They are borne on the last segment of the pedipalps (the front "limbs" of a spider), giving the spider an appearance often descr ... is different. This taran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemirrhagus Benzaa
''Hemirrhagus'' is a genus of Mexican tarantulas that was first described by Eugène Louis Simon in 1903. It is considered a senior synonym of ''Spelopelma''. Species of the genus ''Hemirrhagus'' are 5 to 12 cm long, usually black in colour, the urticating hairs on the opisthosoma are arranged in one dorsomedian patch, two dorsal paramedian patches, or two lateral patches. It is unique amongst the theraphosine genera because of the retrolateral coxal heels, the shape of the male palpal bulb, and the urticating hairs on the abdomen are reduced or completely missing. It is the only genus with epigean, troglophile and troglobitic species. Distribution Hemirrhagus tarantulas are all found in Mexico all of them are largely distributed from Tamaulipas in the north to Chiapas in the south, primarily in the mountainous regions of Sierra Madre Oriental, Eje Volcánico Transversal, Sierra Norte de Oaxaca, and Sierra Madre Sur. All of this tarantulas are found in individual caves, some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemirrhagus Akheronteus
''Hemirrhagus akheronteus'' is a tarantula which is part of the ''Hemirrhagus'' genus. It is found in Mexico, in the state of Queretaro, and is one of many Mexican cave tarantulas. It was first described by Mendoza and Francke in 2018. It is named after the latin word akheronteus, which means "pertaining to the stream of woe", referring to the acheron river in the infernal regions of Greek mythology. Characteristics The tarantula's color is a solid grey or even black, making it blend in well with rocks. This tarantula, although being from the New World, lacks urticating hairs. Males have thorn like hairs on their legs, which are attached to a socket and are mobile. Females lack these hairs. The specimens of this investigation were captured 400m from the cave entrance. Habitat They are found in the cave in the state of Queretaro in the Jalpan de Serra town, inside the cave "Cueva del Río Jalpan". This cave is found in the middle of the Sierra Gorda natural reserve. In th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Height Above Sea Level
Height above mean sea level is a measure of the vertical distance (height, elevation or altitude) of a location in reference to a historic mean sea level taken as a vertical datum. In geodesy, it is formalized as ''orthometric heights''. The combination of unit of measurement and the physical quantity (height) is called "metres above mean sea level" in the metric system, while in United States customary and imperial units it would be called "feet above mean sea level". Mean sea levels are affected by climate change and other factors and change over time. For this and other reasons, recorded measurements of elevation above sea level at a reference time in history might differ from the actual elevation of a given location over sea level at a given moment. Uses Metres above sea level is the standard measurement of the elevation or altitude of: * Geographic locations such as towns, mountains and other landmarks. * The top of buildings and other structures. * Flying objects such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cave
A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word ''cave'' can refer to smaller openings such as sea caves, rock shelters, and grottos, that extend a relatively short distance into the rock and they are called ''exogene'' caves. Caves which extend further underground than the opening is wide are called ''endogene'' caves. Speleology is the science of exploration and study of all aspects of caves and the cave environment. Visiting or exploring caves for recreation may be called ''caving'', ''potholing'', or ''spelunking''. Formation types The formation and development of caves is known as ''speleogenesis''; it can occur over the course of millions of years. Caves can range widely in size, and are formed by various geological processes. These may involve a combination of chemical processes, erosion by water, tectonic forces, microorgani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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