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St Andrews Cross Spider

St Andrews Cross Spider

St Andrews Cross Spider

Sex Argiope keyserlingi - Wikipedia Pics

Argiope keyserlingi is a species of orb-web spider found on the east coast of Australiafrom central New South Wales to northern Queensland. Like many species of orb-web spiderA. Mature Pornhub Com Gratis can be seen during the summer, and seeing multiple males on the web of one female is not uncommon.

Andrew's cross spiderdue to the construction of bands of silk forming the arms of an X-shaped cross, similar to the one upon which St. Andrew is traditionally said to have been crucified.

Juveniles of this species sometimes build a spiral-shaped pattern St Andrews Cross Spider silk. Using this species, scientists have investigated sperm competitionsexual size dimorphism, Facesitting Leggings female choicethe role of pheromones in mating behaviour, and the function and evolution of web decorations.

Its main predators in Sydney are mantids and birds. This type Hiddencamstube orb-weaver is cathemeral.

The spider was named by Fredrich Karsch in after the mythological Greek character of Argiopea nymph from the town Eleusis in southern Greece. Females of the species vary from 10 to 16 mm in size. Their glossy carapaces consist of silver, yellow, red, and black bands on their upper segment with two horizontal yellow belts beneath.

Males of the species generally vary from 3 to 4 mm in size. They are brown and pearly colored. Andrew's cross spiders rest with their legs oriented in pairs.

They construct medium-sized webs on low, shrubby vegetation. Its Gayxtape possesses meandering, bluish-white ribbons consisting of silk that can form either a full or St Andrews Cross Spider cross through the center of the web. The purpose of the crucifix -like stabilimentum has long perplexed biologistswho first thought that the stabilimentum's purpose is to strengthen the web. Other ideas associate it with capturing prey or evading its predatorsthough the purpose of its stabilimentum remains a mystery.

One feature of the stabilimentum is that it effectively reflects ultraviolet light, making it attractive to flying insects. Biologists think this may be to increase the chance of catching its prey. The design of the stabilimentum makes the web and the spider obvious to diurnal predators, especially birds and St Andrews Cross Spider. The shape of this decoration can vary from three shapes, a complete cross, a partial cross possessing one to three arms, or occasionally an absence of a decoration.

This variability can induce web-recognition problems for predators. Biologists also found a possibility that the stabilimentum may be a warning to predators to stay away. Prey of the St Andrew's cross spider include flies, mothsbutterfliesbees, and other insects. The orb-weaver wraps its prey immaculately with silk before digesting, and smaller prey may be prioritized. When the orb-weaver is threatened, it responds by either ejecting from its web or vibrating the web strenuously so the web becomes a blur, confusing its predator.

These two methods may not always succeed, though, as sometimes their corpses can be found in mud cells of wasps and their webs can be left empty and damaged.

Mating takes place from summer to autumn and is a perilous occasion for miniature male St Andrew's cross spiders. Males settles on the upper segment of the web, some of them may even be missing legs, caused by encountering inhospitable females.

The male then materializes Spartacus Porn mating thread within the web, which it attracts Swedish Teen Xxx hospitable female by oscillating the thread. The female then St Andrews Cross Spider her pear-shaped sac in a mesh of threads, frequently surrounded by leaves to camouflage the sac's greenish silk, because egg sacs are the target of wasps and flies.

From Wikipedia, the free encyclopedia. St Andrew's cross spider. Karsch Harvard University. Retrieved A Field Guide to Spiders of Australia. Clayton South Vic. ISBN Australian Journal of Zoology 55 : 1—7. January 1, Retrieved November 13, Gray, Mike September 29, Australian Museum.

Retrieved November 9, Categories : Argiope spider Spiders of Australia Spiders described in Namespaces Article Talk.

Views Read Edit View history. Help Learn to edit Community portal Recent changes St Andrews Cross Spider file. Download as PDF Printable version. Wikimedia Commons Wikispecies. Juvenile female Argiope keyserlingi from Brisbane.

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St Andrews Cross Spider

St Andrews Cross Spider

St Andrews Cross Spider

St Andrews Cross Spider

Argiope keyserlingi is a species of orb-web spider found on the east coast of Australia , from central New South Wales to northern Queensland.

St Andrews Cross Spider

The St. Andrews Cross Spider (Argiope keyserlingi) is a common species of orb-web spider found on the east coast of Australia, from central New South Wales to southern Queensland. The St. Andrew’s Cross Spider is very similar in appearance to the closely north Queensland species, Argiope aetherea (another common, large orb-web spider).Estimated Reading Time: 4 mins.

St Andrews Cross Spider

St Andrews Cross Spider

St Andrews Cross Spider

St Andrews Cross Spider

The St Andrew's Cross Spiders build medium-sized orb webs, occupied day and night, on low shrubby vegetation. The role of the cross-like web decoration, called the stabilimentum, has long been a puzzle. At first thought to strengthen or 'stabilise' the web, more recent ideas associate it with capturing prey or avoiding predators.

The genus Argiope includes rather large spiders that often have a strikingly coloured abdomen. These spiders are distributed throughout the world. The etymology of Argiope is from a Latin word argentum meaning silver. Argiope bruennichi is commonly known as the wasp spider. In Australia , Argiope keyserlingi and Argiope aetherea are known as St Andrew's cross spiders , for their habit of resting in the web with paired legs outstretched in the shape of an X and mirroring the large white web decoration the cross of St. Andrew [3] having the same form.




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