My Living World LW006 Interplay Spider World, Mixed

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Despite a fearsome appearance, Poecilotheria rajaei is intricately patterned with bright yellow banding on its legs and a pink stripe along the abdomen.

Vollrath, F. (1986). "Eusociality and extraordinary sex ratios in the spider Anelosimus eximius (Araneae: Theridiidae)". Behavioral Ecology and Sociobiology. 18 (4): 283–87. doi: 10.1007/BF00300005. S2CID 44727810.The Spider can be an interesting as well as a scary creature. There are several types of them and they range in size and coloring. What may surprise you though is that generally the larger ones aren’t nearly as dangerous as some of the smaller ones. You can judge what a Spider will do based on size and looks alone. As a result many humans are afraid of Spiders. They tend to do all they can to get them out of their homes and habitats. With humans continually invading the territory of the Spider they are having a hard time finding places where they won’t run into humans. Some species of Spiders are currently in danger of extinction due to human efforts. Heavy hunting combined with loss of habitat can prove to be too much for many of them. Most humans aren’t fond of spiders and so they don’t have anything to do with saving them. Spider Information Mammola, Stefano; Malumbres-Olarte, Jagoba; Arabesky, Valeria; Barrales-Alcalá, Diego Alejandro; Barrion-Dupo, Aimee Lynn; Benamú, Marco Antonio; Bird, Tharina L.; Bogomolova, Maria; Cardoso, Pedro; Chatzaki, Maria; Cheng, Ren-Chung; Chu, Tien-Ai; Classen-Rodríguez, Leticia M.; Čupić, Iva; Dhiya’ulhaq, Naufal Urfi (August 2022). "The global spread of misinformation on spiders". Current Biology. 32 (16): R871–R873. doi: 10.1016/j.cub.2022.07.026. ISSN 0960-9822. PMID 35998593. S2CID 251727654. Dunlop, J.A. (1996). "A trigonotarbid arachnid from the Upper Silurian of Shropshire" (PDF). Palaeontology. 39 (3): 605–14. The fossil was originally named Eotarbus but was renamed when it was realized that a Carboniferous arachnid had already been named Eotarbus: Dunlop, J.A. (1999). "A replacement name for the trigonotarbid arachnid Eotarbus Dunlop". Palaeontology. 42 (1): 191. Bibcode: 1999Palgy..42..191D. doi: 10.1111/1475-4983.00068. S2CID 83825904.

a b c d e f Jacobsen, Thorkild (1987). The Harps that Once: Sumerian Poetry in Translation. New Haven, Connecticut: Yale University Press. p.184. ISBN 978-0-300-07278-5. Once hatched, baby spiders go through several stages of growth before becoming adults. During these stages, called instars, they shed their exoskeleton multiple times as they grow bigger and stronger. After reaching adulthood, most spiders will only live for one or two years before dying off naturally due to old age or predation from other animals. Conservation and Population Female spiders' reproductive tracts are arranged in one of two ways. The ancestral arrangement ("haplogyne" or "non-entelegyne") consists of a single genital opening, leading to two seminal receptacles (spermathecae) in which females store sperm. In the more advanced arrangement ("entelegyne"), there are two further openings leading directly to the spermathecae, creating a "flow through" system rather than a "first-in first-out" one. Eggs are as a general rule only fertilized during oviposition when the stored sperm is released from its chamber, rather than in the ovarian cavity. [40] A few exceptions exist, such as Parasteatoda tepidariorum. In these species the female appears to be able to activate the dormant sperm before oviposition, allowing them to migrate to the ovarian cavity where fertilization occurs. [41] [42] [43] The only known example of direct fertilization between male and female is an Israeli spider, Harpactea sadistica, which has evolved traumatic insemination. In this species the male will penetrate its pedipalps through the female's body wall and inject his sperm directly into her ovaries, where the embryos inside the fertilized eggs will start to develop before being laid. [44] Brescovit, Antonio D.; Sánchez-Ruiz, Alexander (6 October 2016). "Descriptions of two new genera of the spider family Caponiidae (Arachnida, Araneae) and an update of Tisentnops and Taintnops from Brazil and Chile". ZooKeys (622): 47–84. doi: 10.3897/zookeys.622.8682. ISSN 1313-2989. PMC 5096409. PMID 27843380. The largest spider in the world is the giant huntsman spider. It measures a foot wide across its legs. Incredibly, this spider was only discovered this century and lives in caves in the country of Laos.Like other arthropods, spiders are coelomates in which the coelom is reduced to small areas around the reproductive and excretory systems. Its place is largely taken by a hemocoel, a cavity that runs most of the length of the body and through which blood flows. The heart is a tube in the upper part of the body, with a few ostia that act as non-return valves allowing blood to enter the heart from the hemocoel but prevent it from leaving before it reaches the front end. [16] However, in spiders, it occupies only the upper part of the abdomen, and blood is discharged into the hemocoel by one artery that opens at the rear end of the abdomen and by branching arteries that pass through the pedicle and open into several parts of the cephalothorax. Hence spiders have open circulatory systems. [13] The blood of many spiders that have book lungs contains the respiratory pigment hemocyanin to make oxygen transport more efficient. [14]

Barghusen, L.E.; Claussen, D.L.; Anderson, M.S.; Bailer, A.J. (1 February 1997). "The effects of temperature on the web-building behaviour of the common house spider, Achaearanea tepidariorum". Functional Ecology. 11 (1): 4–10. doi: 10.1046/j.1365-2435.1997.00040.x. Different smiles, single species". University of California Museum of Paleontology . Retrieved 10 October 2008.Li, D. & Lee, W.S. (2004). "Predator-induced plasticity in web-building behaviour". Animal Behaviour. 67 (2): 309–18. doi: 10.1016/j.anbehav.2003.06.011. S2CID 53166407. a b Agnarsson, I. (2004). "Morphological phylogeny of cobweb spiders and their relatives (Araneae, Araneoidea, Theridiidae)". Zoological Journal of the Linnean Society. 141 (4): 447–626. doi: 10.1111/j.1096-3642.2004.00120.x.