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Crab Spiders
The Thomisidae are a family of spiders, including about 170 genera and over 2,100 species. The common name crab spider is often linked to species in this family, but is also applied loosely to many other families of spiders. Many members of this family are also known as flower spiders or flower crab spiders. Description Members of this family of spiders do not spin webs, and are ambush predators. The two front legs are usually longer and more robust than the rest of the legs. The back two legs are smaller, and are usually covered in a series of strong spines. They have dull colorations such as brown, grey, or very bright green, pink, white or yellow. They gain their name from the shape of their body, and they usually move sideways or backwards. These spiders are quite easy to identify and can very rarely be confused with Sparassidae family, though the crab spiders are usually smaller. Etymology Spiders in this family are called "crab spiders" due to their resemblance to crab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Jakob Sundevall
Carl Jakob Sundevall (22 October 1801, Högestad – 2 February 1875) was a Swedish zoologist. Sundevall studied at Lund University, where he became a Ph.D. in 1823. After traveling to East Asia, he studied medicine, graduating as Doctor of Medicine in 1830. He was employed at the Swedish Museum of Natural History, Stockholm from 1833, and was professor and keeper of the vertebrate section from 1839 to 1871. He wrote ''Svenska Foglarna'' (1856–87) which described 238 species of birds observed in Sweden. He classified a number of birds collected in southern Africa by Johan August Wahlberg. In 1835, he developed a phylogeny for the birds based on the muscles of the hip and leg that contributed to later work by Thomas Huxley. He then went on to examine the arrangement of the deep plantar tendons in the bird's foot. This latter information is still used by avian taxonomists. Sundevall was also an entomologist and arachnologist, for which (for the latter field) in 1833 he publish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xysticus
''Xysticus'' is a genus of ground crab spiders described by C. L. Koch in 1835, belonging to the order Araneae, family Thomisidae. The genus name is derived from the Ancient Greek root ''xyst'', meaning "scraped, scraper". Description ''Xysticus'' and '' Coriarachne'' are dark brown or reddish-brown crab spiders often encountered on weeds or trees. While similar to the 'flower spiders', they tend to have shorter, sturdier legs. Many, but not all, species have abdomens more patterned than most ''Thomisus'' species, rather like some of the ''Synema'' species. Some however, that are more terrestrial, resemble earth in colour and texture. Most species of the genus Xysticus are small to medium sized spiders. They show a sexual dimorphism in size. Females of typical species reach a maximum of of body length, while their males are about long, about half the size of the females. The basic colour of these species is usually brown, beige or gray. The prosoma is sometimes slightly smal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camaricus Sp
''Camaricus'' is a genus of crab spiders that was first described by Tamerlan Thorell in 1887. Species it contains fifteen species, found in Africa, Asia, and on New Caledonia: *'' Camaricus bipunctatus'' Bastawade, 2002 – India *'' Camaricus castaneiceps'' Berland, 1924 – New Caledonia *'' Camaricus chayani'' Biswas & Raychaudhuri, 2017 – Bangladesh *'' Camaricus cimex'' ( Karsch, 1878) – East Africa *'' Camaricus florae'' Barrion & Litsinger, 1995 – Philippines *'' Camaricus formosus'' Thorell, 1887 – India to Indonesia (Sumatra), China, Philippines *'' Camaricus hastifer'' (Percheron, 1833) – Unknown *'' Camaricus khandalaensis'' Tikader, 1980 – India *'' Camaricus maugei'' (Walckenaer, 1837) ( type) – India to Vietnam, Indonesia (Sumatra, Java, Krakatau) *'' Camaricus mimus'' (Pavesi, 1895) – Ethiopia, East Africa *'' Camaricus nigrotesselatus'' Simon, 1895 – Central, East, South Africa *'' Camaricus parisukatus'' Barrion & Litsinger, 1995 – Philippine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amyciaea Sp
''Amyciaea'' is a genus of ant mimicking crab spiders that was first described by Eugène Louis Simon in 1885. They mimic weaver ants, their preferred prey. Description Spiders in this genus are generally around 5mm in length. They don't have the typical leg position or strong distinction between fore and hind legs typical of thomisids, instead holding the front two legs in the air to mimic antennae. The abdomen bears two dark spots which resemble the compound eyes of Weaver ants. Despite the "antennae" and "eyes" being on opposite sides of the body, the camouflage is effective enough to fool surrounding animals. Behaviour Spiders in this genus live and build their nests in foliage, and on the twigs of trees and bushes. They hang by a silken thread at a safe distance from the ant path to avoid accidental interactions, and feed on the ants by biting their head, instantly paralysing them. The males of this genus exhibit bridging behaviour when searching for a mate; similar t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angaeus Sp
''Angaeus'' is a genus of Asian crab spiders first described by Tamerlan Thorell in 1881. It is considered a senior synonym of ''Paraborboropactus''. Species it contained twelve species, found in Asia: *'' Angaeus canalis'' (Tang & Li, 2010) – China *'' Angaeus christae'' Benjamin, 2013 – Borneo *'' Angaeus comatulus'' Simon, 1909 – Vietnam *'' Angaeus lenticulosus'' Simon, 1903 – China, Vietnam *'' Angaeus liangweii'' (Tang & Li, 2010) – China *'' Angaeus pentagonalis'' Pocock, 1901 – India (mainland, Andaman Is.) *'' Angaeus pudicus'' Thorell, 1881 ( type) – Indonesia (Moluccas, Seram Island) *'' Angaeus rhombifer'' Thorell, 1890 – China, Myanmar, Vietnam, Malaysia, Singapore, Indonesia (Sumatra), Borneo *'' Angaeus rhombus'' (Tang & Li, 2009) – China *'' Angaeus verrucosus'' Benjamin, 2017 – Malaysia (Borneo) *'' Angaeus xieluae'' (Liu, 2022) – China *'' Angaeus zhengi'' (Tang & Li, 2009) – China See also * List of Thomisidae species The Thomisid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Misumena Vatia Female Luc Viatour 1
''Misumena'' is a genus of crab spiders sometimes referred to as flower crab spiders. They are similar in appearance to several other genera in the family Thomisidae, such as '' Misumenoides'' and '' Mecaphesa''. ''Misumena vatia'', the goldenrod crab spider, is a North American species commonly seen hunting in goldenrod (''Solidago'') sprays in autumn. It can change its color between white and yellow to match the flower it is sitting on. The color change takes a few days. Species , the World Spider Catalog The World Spider Catalog (WSC) is an online searchable database concerned with spider taxonomy. It aims to list all accepted families, genera and species, as well as provide access to the related taxonomic literature. The WSC began as a series of ... listed the following 40 species: References * (2008)The world spider catalog version 8.5. ''American Museum of Natural History''. Thomisidae Thomisidae genera Cosmopolitan spiders Taxa named by Pierre André Latr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fecundity
Fecundity is defined in two ways; in human demography, it is the potential for reproduction of a recorded population as opposed to a sole organism, while in population biology, it is considered similar to fertility, the natural capability to produce offspring, measured by the number of gametes (eggs), seed set, or asexual propagules. Superfecundity refers to an organism's ability to store another organism's sperm (after copulation) and fertilize its own eggs from that store after a period of time, essentially making it appear as though fertilization occurred without sperm (i.e. parthenogenesis). Human demography Human demography considers only human fecundity, at its culturally differing rates, while population biology studies all organisms. The term ''fecundity'' in population biology is often used to describe the rate of offspring production after one time step (often annual). In this sense, fecundity may include both birth rates and survival of young to that time step. Whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomisus Onustus
''Thomisus onustus'' is a crab spider belonging to the genus '' Thomisus''. These spiders are found across Europe, North Africa, and parts of the Middle East and Asia. ''T. onustus'' reside in flowers in lowland vegetation. Females are distinguished by their larger size and ability to change color between white, yellow, and pink as a means of matching flower color. This cryptic mimicry allows them to both evade predators and enhance insect prey capture abilities. Males are smaller, more slender, and drab in coloration, usually green or brown. ''T. onustus'' is also distinguished from other relatives by its distinct life cycle patterns in which spiderlings emerge in either late summer or early spring. Furthermore, ''T. onustus'' have developed a mutualistic relationship with host plants where spiders feed on and/or deter harmful florivores while benefiting from the plant's supply of pollen and nectar, which ''T. onustus'' spiders are able to use as food sources, especially during pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sexual Dimorphism
Sexual dimorphism is the condition where the sexes of the same animal and/or plant species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most animals and some plants. Differences may include secondary sex characteristics, size, weight, colour, markings, or behavioural or cognitive traits. These differences may be subtle or exaggerated and may be subjected to sexual selection and natural selection. The opposite of dimorphism is ''monomorphism'', which is when both biological sexes are phenotypically indistinguishable from each other. Overview Ornamentation and coloration Common and easily identified types of dimorphism consist of ornamentation and coloration, though not always apparent. A difference in coloration of sexes within a given species is called sexual dichromatism, which is commonly seen in many species of birds and reptiles. Sexual selection leads to the exaggerated dim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spider Bite
A spider bite, also known as arachnidism, is an injury resulting from the bite of a spider. The effects of most bites are not serious. Most bites result in mild symptoms around the area of the bite. Rarely they may produce a necrotic skin wound or severe pain. Most spiders do not cause bites that are of importance. For a bite to be significant, substantial envenomation is required. Bites from the widow spiders involve a neurotoxic venom which produces a condition known as latrodectism. Symptoms may include pain which may be at the bite or involve the chest and abdomen, sweating, muscle cramps and vomiting among others. Bites from the recluse spiders cause the condition loxoscelism, in which local necrosis of the surrounding skin and widespread breakdown of red blood cells may occur. Headaches, vomiting and a mild fever may also occur. Other spiders that can cause significant bites include the Australian funnel-web spider and South American wandering spider. Efforts to preve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Recluse Spider
The recluse spiders (''Loxosceles'' (), also known as brown spiders, fiddle-backs, violin spiders, and reapers, is a genus of spiders that was first described by R. T. Lowe in 1832. They are venomous spiders known for their bite, which sometimes produces a characteristic set of symptoms known as loxoscelism. Recluse spiders are now identified as members of the family Sicariidae, having formerly been placed in their own family, the Loxoscelidae. Although recluse spiders are feared, they are usually not aggressive. Relation with other spiders Sicariidae are of the superfamily Scytodoidea. Other families in the Scytodoidea include Drymusidae, Scytodidae, and Periegopidae. Habitat and appearance ''Loxosceles'' is distributed nearly worldwide in warmer areas. All have six eyes arranged in three groups of two (dyads) and some are brownish with a darker brown characteristic violin marking on the cephalothorax. However, the "violin marking" cannot be used as a reliable way to ident ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
