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Cheiracanthium
''Cheiracanthium'', commonly called ''yellow sac spiders'', is a genus of Araneomorphae, araneomorph spiders in the family Cheiracanthiidae, and was first described by Carl Ludwig Koch in 1839. They are usually pale in colour, and have an spider anatomy#Abdomen, abdomen that can range from yellow to beige. Both sexes range in size from . They are unique among common house spiders because their tarsus (arthropod), tarsi do not point either outward, like members of ''Tegenaria'', or inward, like members of ''Araneus''), making them easier to identify. The name is a reference to the backwardly directed process on the cymbium of the male palp. The species epithet is derived from the Greek grc, wikt:χείρ, χείρ, cheir, meaning "hand", and ''Acanthium'', a genus of thorny-stemmed plants. Venom Though they are beneficial predators in agricultural fields, they are also known to be mildly venomous to humans. Painful bites may be incurred from species such as ''Cheiracanthium pu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheiracanthium Male Schematic
''Cheiracanthium'', commonly called ''yellow sac spiders'', is a genus of Araneomorphae, araneomorph spiders in the family Cheiracanthiidae, and was first described by Carl Ludwig Koch in 1839. They are usually pale in colour, and have an spider anatomy#Abdomen, abdomen that can range from yellow to beige. Both sexes range in size from . They are unique among common house spiders because their tarsus (arthropod), tarsi do not point either outward, like members of ''Tegenaria'', or inward, like members of ''Araneus''), making them easier to identify. The name is a reference to the backwardly directed process on the cymbium of the male palp. The species epithet is derived from the Greek grc, wikt:χείρ, χείρ, cheir, meaning "hand", and ''Acanthium'', a genus of thorny-stemmed plants. Venom Though they are beneficial predators in agricultural fields, they are also known to be mildly venomous to humans. Painful bites may be incurred from species such as ''Cheiracanthium pu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheiracanthium Eye Group
''Cheiracanthium'', commonly called ''yellow sac spiders'', is a genus of araneomorph spiders in the family Cheiracanthiidae, and was first described by Carl Ludwig Koch in 1839. They are usually pale in colour, and have an abdomen that can range from yellow to beige. Both sexes range in size from . They are unique among common house spiders because their tarsi do not point either outward, like members of ''Tegenaria'', or inward, like members of '' Araneus''), making them easier to identify. The name is a reference to the backwardly directed process on the cymbium of the male palp. The species epithet is derived from the Greek grc, χείρ, cheir, meaning "hand", and '' Acanthium'', a genus of thorny-stemmed plants. Venom Though they are beneficial predators in agricultural fields, they are also known to be mildly venomous to humans. Painful bites may be incurred from species such as '' C. punctorium'' in Europe, '' C. mildei'' in Europe and North America, '' C. inclusu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheiracanthium Inclusum
''Cheiracanthium inclusum'', alternately known as the black-footed yellow sac spider or the American yellow sac spider (in order to distinguish it from its European cousin '' C. punctorium''), was formerly classified as a true sac spider (of the family Clubionidae), and then placed in the family Miturgidae, but now belongs to family Cheiracanthiidae. It is a rather small pale yellow species that is indigenous to the Americas. It is often found living in the foliage of forests and gardens but also can inhabit human homes. Despite common beliefs of necrosis, ''Cheiracanthium'' bites cause only localized swelling. ''C. inclusum'' is closely related to '' Cheiracanthium mildei'', an introduced species native to Europe which is similar in appearance and natural history and can also be found in North American homes. Identification Like all spiders, ''C. inclusum'' has two body segments: a cephalothorax (fused head and thorax) and an abdomen. In females, the body measures between 5 and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheiracanthium Punctorium
''Cheiracanthium punctorium'', one of several species commonly known as the yellow sac spider, is a spider found from central Europe to Central Asia. They reach a length of about 15 mm, and their bite can penetrate human skin; the bite has been compared to a wasp sting, perhaps a bit more severe, although susceptible persons can have stronger reactions, like nausea. Females build an egg sac of about 4 cm in high grass. It opens below and is aggressively defended. In Germany, where it is the only "seriously" venomous spider, it is a rare species, only known to occur in notable numbers in the Kaiserstuhl region, the hottest part of the country. Due to changing weather patterns, leading to increased aridity and less precipitation in some areas, this species spreads to more northern parts of Europe, e.g. Brandenburg, Germany, where the present trend is towards a climate more similar to the Central Asian steppes where ''C. punctorium'' is most numerous. The genus ''Che ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheiracanthium Mildei
''Cheiracanthium mildei'' is a species of spider from the family Cheiracanthiidae. ''C. mildei'' is commonly known as the northern yellow sac spider, a name it partially shares with many other spiders of its genus. Description ''C. mildei'' usually has a pale green or tan body, with darker brown palpi and chelicerae. An adult ''C. mildei'' is usually in body size. Each leg ends in double claws, and the front pair is significantly longer (up to two times the size). The eyes have a tapetum lucidum that reflects back to the light source once lit, however the "canoe-shaped" tapetum they possess is incapable of forming sharp images, so the benefit of these tapetum is uncertain, although they may assist in navigation through the detection of the polarization of light from the sky. Although this spider can bite humans, the effects appear to be mild. Habitat and distribution ''C. mildei'' is native to Europe and North Africa through to Central Asia. It is introduced to the United ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheiracanthiidae
''Cheiracanthiidae'' is a family of araneomorph spiders first described by Vladimir Wagner in 1887. The synonym Eutichuridae was used for a long time, but Cheiracanthiidae has priority. The largest genus currently recognized as belonging to this family is ''Cheiracanthium'', which has previously been placed in both the Clubionidae and the Miturgidae. Taxonomy It was recognized as a synonym of "Eutichuridae" in 2009, but was in danger of becoming obsolete until it was resurrected in 2011. The group was originally described as the subfamily Eutichurinae of the family Miturgidae by Pekka T. Lehtinen in 1967. The monophyly of the group is described as "reasonably uncontroversial", but it has been placed in either the Miturgidae or the Clubionidae. An analysis by Martín J. Ramírez in 2014 suggested that it was better considered as a separate family. Genera , the World Spider Catalog accepts the following genera: *'' Calamoneta'' Deeleman-Reinhold, 2001 — Indonesia *'' Calamopu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Araneomorphae
The Araneomorphae (also called the Labidognatha) are an infraorder of spiders. They are distinguishable by chelicerae (fangs) that point diagonally forward and cross in a pinching action, in contrast to the Mygalomorphae (tarantulas and their close kin), where they point straight down. Araneomorphs comprise the vast majority of living spiders. Distinguishing characteristics Most spider species are Araneomorphae, which have fangs that face towards each other, increasing the orientations they can employ during prey capture. They have fewer book lungs (when present), and the females typically live one year. The Mygalomorphae have fangs that face towards the ground, and which are parallel to the long axis of the spider's body, thus they have only one orientation they can employ during prey capture. They have four pairs of book lungs, and the females often live many years. Image:Atrax robustus.jpg, This ''Atrax robustus'' shows the orientation of Myglamorphae fangs. Image:C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inflammation
Inflammation (from la, inflammatio) is part of the complex biological response of body tissues to harmful stimuli, such as pathogens, damaged cells, or irritants, and is a protective response involving immune cells, blood vessels, and molecular mediators. The function of inflammation is to eliminate the initial cause of cell injury, clear out necrotic cells and tissues damaged from the original insult and the inflammatory process, and initiate tissue repair. The five cardinal signs are heat, pain, redness, swelling, and loss of function (Latin ''calor'', ''dolor'', ''rubor'', ''tumor'', and ''functio laesa''). Inflammation is a generic response, and therefore it is considered as a mechanism of innate immunity, as compared to adaptive immunity, which is specific for each pathogen. Too little inflammation could lead to progressive tissue destruction by the harmful stimulus (e.g. bacteria) and compromise the survival of the organism. In contrast, too much inflammation, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans Japanese archipelago, an archipelago of List of islands of Japan, 6852 islands covering ; the five main islands are Hokkaido, Honshu (the "mainland"), Shikoku, Kyushu, and Okinawa Island, Okinawa. Tokyo is the Capital of Japan, nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto. Japan is the List of countries and dependencies by population, eleventh most populous country in the world, as well as one of the List of countries and dependencies by population density, most densely populated and Urbanization by country, urbanized. About three-fourths of Geography of Japan, the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Necrosis
Necrosis () is a form of cell injury which results in the premature death of cells in living tissue by autolysis. Necrosis is caused by factors external to the cell or tissue, such as infection, or trauma which result in the unregulated digestion of cell components. In contrast, apoptosis is a naturally occurring programmed and targeted cause of cellular death. While apoptosis often provides beneficial effects to the organism, necrosis is almost always detrimental and can be fatal. Cellular death due to necrosis does not follow the apoptotic signal transduction pathway, but rather various receptors are activated and result in the loss of cell membrane integrity and an uncontrolled release of products of cell death into the extracellular space. This initiates in the surrounding tissue an inflammatory response, which attracts leukocytes and nearby phagocytes which eliminate the dead cells by phagocytosis. However, microbial damaging substances released by leukocytes would cre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pain
Pain is a distressing feeling often caused by intense or damaging stimuli. The International Association for the Study of Pain defines pain as "an unpleasant sensory and emotional experience associated with, or resembling that associated with, actual or potential tissue damage." In medical diagnosis, pain is regarded as a symptom of an underlying condition. Pain motivates the individual to withdraw from damaging situations, to protect a damaged body part while it heals, and to avoid similar experiences in the future. Most pain resolves once the noxious stimulus is removed and the body has healed, but it may persist despite removal of the stimulus and apparent healing of the body. Sometimes pain arises in the absence of any detectable stimulus, damage or disease. Pain is the most common reason for physician consultation in most developed countries. It is a major symptom in many medical conditions, and can interfere with a person's quality of life and general functioning. Simp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Africa
Southern Africa is the southernmost subregion of the African continent, south of the Congo and Tanzania. The physical location is the large part of Africa to the south of the extensive Congo River basin. Southern Africa is home to a number of river systems; the Zambezi River being the most prominent. The Zambezi flows from the northwest corner of Zambia and western Angola to the Indian Ocean on the coast of Mozambique. Along the way, the Zambezi River flows over the mighty Victoria Falls on the border between Zambia and Zimbabwe. Victoria Falls is one of the largest waterfalls in the world and a major tourist attraction for the region. Southern Africa includes both subtropical and temperate climates, with the Tropic of Capricorn running through the middle of the region, dividing it into its subtropical and temperate halves. Countries commonly included in Southern Africa include Angola, Botswana, the Comoros, Eswatini, Lesotho, Madagascar, Malawi, Mauritius, Mozamb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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