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Zygiella X-notata
''Zygiella x-notata'', sometimes known as the missing sector orb weaver or the silver-sided sector spider,Factsheet 6: Missing-sector Orbweaver (Zygiella x-notata)', British Arachnological Society, 2016. Retrieved 27 November 2016 is a spider species in the family Araneidae. They are solitary spiders, residing in daily-spun orb webs. ''Z. x-notata'' is a member of the genus ''Zygiella'', the orb-weaving spiders. The adult female is easily recognized by the characteristic leaf-like mark on her posterior opisthosoma, caudal to the yellow-brown cephalothorax. The webs of ''Zygiella x-notata'' spiders are known for their characteristic missing sector, lending to the common name of spider as the "missing sector orb weaver." This species is distributed widely around the world, primarily inhabiting areas of human occupancy in northern Europe. Common prey include flying insects and other small insects. These get caught in the sticky spiral hub of the spider's orb web. Capture of prey o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carl Alexander Clerck
Carl Alexander Clerck (1709 – 22 July 1765) was a Swedish entomologist and arachnologist. Clerck came from a family in the petty nobility and entered the University of Uppsala in 1726. Little is known of his studies; although a contemporary of Linnaeus, it is unknown whether he had any contact with him during his time in Uppsala. His limited means forced him to leave university early and enter into government service, later ending up working in the administration of the City of Stockholm. His interest in natural history appears to have come at a more mature age, influenced by a lecture of Linnaeus he attended in Stockholm in 1739. In the following years he collected and categorized many spiders, published together with more general observations on the morphology and behaviour of spiders, in his '' Svenska Spindlar'' ("Swedish spiders", 1757, also known by its Latin subtitle, ''Aranei Suecici''). He also started the publication of ''Icones insectorum rariorum'', a series of det ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prosoma
The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. (The terms ''prosoma'' and ''opisthosoma'' are equivalent to ''cephalothorax'' and ''abdomen'' in some groups.) The word ''cephalothorax'' is derived from the Greek words for head (, ') and thorax (, '). This fusion of the head and thorax is seen in chelicerates and crustaceans; in other groups, such as the Hexapoda (including insects), the head remains free of the thorax. In horseshoe crabs and many crustaceans, a hard shell called the carapace covers the cephalothorax. Arachnid anatomy Fovea The fovea is the centre of the cephalothorax and is located behind the head (only in spiders).Dalton, Steve (2008). ''Spiders; The Ultimate Predators''. A & C Black, London. P.p. 19. . It is often important in identification. It can be transverse or procurved Smith, A. M. (1990c). Baboon spiders: Tarantulas of Afr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iteroparous
Semelparity and iteroparity are two contrasting reproductive strategies available to living organisms. A species is considered semelparous if it is characterized by a single reproductive episode before death, and iteroparous if it is characterized by multiple reproductive cycles over the course of its lifetime. Iteroparity can be further divided into continuous iteroparity (primates including humans and chimpanzees) and seasonal iteroparity (birds, dogs, etc.) Some botanists use the parallel terms monocarpy and polycarpy. (See also plietesials.) In truly semelparous species, death after reproduction is part of an overall strategy that includes putting all available resources into maximizing reproduction, at the expense of future life (see § Trade-offs). In any iteroparous population there will be some individuals who die between their first and second reproductive episodes, but unless this is part of a syndrome of programmed death after reproduction, this would not be called ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Female Zygiella X-notata
Female ( symbol: ♀) is the sex of an organism that produces the large non-motile ova (egg cells), the type of gamete (sex cell) that fuses with the male gamete during sexual reproduction. A female has larger gametes than a male. Females and males are results of the anisogamous reproduction system, wherein gametes are of different sizes, unlike isogamy where they are the same size. The exact mechanism of female gamete evolution remains unknown. In species that have males and females, sex-determination may be based on either sex chromosomes, or environmental conditions. Most female mammals, including female humans, have two X chromosomes. Female characteristics vary between different species with some species having pronounced secondary female sex characteristics, such as the presence of pronounced mammary glands in mammals. In humans, the word ''female'' can also be used to refer to gender in the social sense of gender role or gender identity. Etymology and usage T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arachnid
Arachnida () is a class of joint-legged invertebrate animals (arthropods), in the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons. Almost all adult arachnids have eight legs, although the front pair of legs in some species has converted to a sensory function, while in other species, different appendages can grow large enough to take on the appearance of extra pairs of legs. The term is derived from the Greek word (''aráchnē'', 'spider'), from the myth of the hubristic human weaver Arachne, who was turned into a spider. Almost all extant arachnids are terrestrial, living mainly on land. However, some inhabit freshwater environments and, with the exception of the pelagic zone, marine environments as well. They comprise over 100,000 named species, of which 47,000 are species of spiders. Morphology Almost all adult arachnids have eight legs, unlike adult i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Egg Sac
Spiders (order (biology), order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude spider silk, silk. They are the largest order of arachnids and rank seventh in total species diversity among all Order (biology), 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 Family (biology), families have been recorded by Taxonomy (biology), 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 segmentation (biology), segments are fused into two Tagma (biology), tagmata, the cephalothorax or prosoma, and the opisthosoma, or abdomen, and joined by a small, cylindrical Gl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Instar
An instar (, from the Latin '' īnstar'', "form", "likeness") is a developmental stage of arthropods, such as insects, between each moult (''ecdysis''), until sexual maturity is reached. Arthropods must shed the exoskeleton in order to grow or assume a new form. Differences between instars can often be seen in altered body proportions, colors, patterns, changes in the number of body segments or head width. After shedding their exoskeleton (moulting), the juvenile arthropods continue in their life cycle until they either pupate or moult again. The instar period of growth is fixed; however, in some insects, like the salvinia stem-borer moth, the number of instars depends on early larval nutrition. Some arthropods can continue to moult after sexual maturity, but the stages between these subsequent moults are generally not called instars. For most insect species, an ''instar'' is the developmental stage of the larval forms of holometabolous (complete metamorphism) or nymphal fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2013
File:2013 Events Collage V2.png, From left, clockwise: Edward Snowden becomes internationally famous for leaking classified NSA wiretapping information; Typhoon Haiyan kills over 6,000 in the Philippines and Southeast Asia; The Dhaka garment factory collapse in Bangladesh kills over 1,000 people; The streak from the Chelyabinsk meteor that rocketed across the Russian morning sky; Protests occur amid the coup d'état that overthrew President Mohamed Morsi of Egypt; Smoke rises as a result of the Westgate shopping mall attack in Nairobi, Kenya, carried out by Al-Shabaab militants; The Boston Marathon bombing marks the first terrorist attack in the United States since 9/11; Pope Francis is elected to the Papacy in the 2013 papal conclave., 300x300px, thumb rect 0 0 200 200 Edward Snowden rect 200 0 400 200 Typhoon Haiyan rect 400 0 600 200 Dhaka garment factory collapse rect 0 200 300 400 2013 papal conclave rect 300 200 600 400 Chelyabinsk meteor rect 0 400 200 600 Bosto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2015
File:2015 Events Collage new.png, From top left, clockwise: Civil service in remembrance of November 2015 Paris attacks; Germanwings Flight 9525 was purposely crashed into the French Alps; the rubble of residences in Kathmandu following the April 2015 Nepal earthquake; World Leaders pose for a picture during the 2015 Paris Agreement; an airstrike in Sana'a during the Saudi Arabian–led intervention in Yemen; Refugees of the Syrian civil war come ashore in Greece; FIFA president Sepp Blatter is forced to resign in disgrace in the wake of the 2015 FIFA corruption case; New Horizons makes a flyby and takes the first images of Pluto., 300x300px, thumb rect 0 0 200 200 November 2015 Paris attacks rect 200 0 400 200 Germanwings Flight 9525 rect 400 0 600 200 April 2015 Nepal earthquake rect 0 200 300 400 New Horizons rect 300 200 600 400 Paris Agreement rect 0 400 200 600 2015 FIFA corruption case rect 200 400 400 600 Refugees of the Syrian civil war rect 400 400 600 600 Saudi Arabian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spider Web
A spider web, spiderweb, spider's web, or cobweb (from the archaic word '' coppe'', meaning "spider") is a structure created by a spider out of proteinaceous spider silk extruded from its spinnerets, generally meant to catch its prey. Spider webs have existed for at least 100 million years, as witnessed in a rare find of Early Cretaceous amber from Sussex, in southern England. Many spiders build webs specifically to trap and catch insects to eat. However, not all spiders catch their prey in webs, and some do not build webs at all. "Spider web" is typically used to refer to a web that is apparently still in use (i.e. clean), whereas "cobweb" refers to abandoned (i.e. dusty) webs. However, the word "cobweb" is also used by biologists to describe the tangled three-dimensional web of some spiders of the family Theridiidae. While this large family is known as the cobweb spiders, they actually have a huge range of web architectures; other names for this spider family include tang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foreleg
A forelimb or front limb is one of the paired articulated appendages (limbs) attached on the cranial (anterior) end of a terrestrial tetrapod vertebrate's torso. With reference to quadrupeds, the term foreleg or front leg is often used instead. In bipedal animals with an upright posture (e.g. humans and some primates), the term upper limb is often used. A forelimb is not to be confused with a forearm, which is a distal portion of the human upper limb between the elbow and the wrist. All vertebrate forelimbs are homologous, meaning that they all evolved from the same structures. For example, the flipper of a turtle or of a dolphin, the arm of a human, the foreleg of a horse, and the wings of both bats and birds are ultimately homologous, despite the large differences between them. Specific uses of the forelimbs may be analogous if they evolved from different sub-structures of the forelimb, such as the flippers of turtles and dolphins, and the wings of birds and bats. Evo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spider And Fly
Spider and the Fly may refer to: Film and television * ''The Spider and the Fly'' (1916 film), an American film of 1916 * ''The Spider and the Fly'' (1931 film), a ''Silly Symphony'' cartoon * ''Spider and the Fly'' (1936 film) or ''Rogue of the Range'', an American western directed by S. Roy Luby * ''The Spider and the Fly'' (1949 film), a British crime film directed by Robert Hamer * "Spider and the Fly" (''NCIS''), a television episode * "The Spider and the Fly" (''Spider-Man''), a television episode Literature * "The Spider and the Fly" (poem), an 1829 poem by Mary Howitt * ''The Spider and the Fly'' (DiTerlizzi book), a 2002 children's picture book by Tony DiTerlizzi * ''The Spider and the Fly'' (Rowe book), a 2017 nonfiction book by Claudia Rowe Music * "The Spider and the Fly" (song), by the Rolling Stones, 1965 *"Spider and the Fly", a 1946 song by Myra Taylor See also *The spider and the fly problem 400px, Isometric projection and net of naive (1) and optimal (2) solu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
