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Crab Spider


Crab Spider
Photo Information
Copyright: Paulo Lahr (pflahr) Silver Note Writer [C: 3 W: 0 N: 33] (510)
Genre: Animals
Medium: Color
Date Taken: 2009-12-29
Categories: Spiders
Camera: Sony Cyber-shot DSC-H5
Exposure: f/5.0, 1/500 seconds
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2009-12-30 6:43
Viewed: 3951
Points: 2
[Note Guidelines] Photographer's Note
Crab Spider

Crab Spider, any member of several families of free-living spiders that resemble small crabs. Crab spiders have short, wide, flattened bodies. The first two or three pairs of legs are longer than the rest and are normally held out from the sides of the body as a crab would hold its claws. Some crab spiders can walk forward, backward, or sideways like fiddler crabs. Worldwide there are about 2000 known species of crab spiders, 200 of which occur in North America.

Most crab spiders are less than 1 cm (0.4 in) in length, although the giant crab spider may reach 2.5 cm (1.0 in). Crab spiders do not spin webs to trap prey, but hunt on the open ground or on vegetation or flowers. In this, they resemble other free-living spiders such as jumping spiders and wolf spiders. Unlike other free-living spiders, however, all of a crab spider's eyes are small and serve primarily as motion detectors. Typical crab spiders are predators that lie in wait to ambush their prey. Though their chelicerae, or jaws, are rather small and slender, many crab spiders possess potent venoms that quickly immobilize their prey. Flower spiders, a particular type of crab spider, rest on flowers and remain motionless for long periods of time with their front two pairs of legs extended in readiness. They ambush butterflies, bees, flies, and other flower visitors; their venoms enable them to successfully attack insects much larger than themselves. They do not wrap their prey in silk after biting, but instead remain with the immobilized prey until they have sucked it dry.

In keeping with their ambush style of attack, many crab spiders are well camouflaged, blending in with their backgrounds. Some resemble tree bark, leaves, or fruits; others appear to mimic bird droppings. Some of the flower spiders are able to change their color over several days, typically between white and yellow, depending on the color of the flower on which they are resting. A common North American species is the goldenrod spider. The giant cockroach hunter is a warm-climate species which often moves northward on shipments of bananas.

Scientific classification: Common crab spiders are classified in the spider families Thomisidae and Philodromidae. Giant crab spiders, including the cockroach hunter, Heteropoda venatoria, are in the family Theridiosomatidae. The goldenrod spider is Misumena vatia, family Thomisidae.


A maioria das aranhas caranguejo são menos de 1 cm (0,4 in) de comprimento, embora o caranguejo aranha gigante pode atingir 2,5 cm (1,0 in). Aranhas Caranguejo não teias de rapina armadilha, mas caçar no terreno aberto ou na vegetação ou flores. Nesse sentido, se assemelham a outros livre-aranhas vivos, tais como aranhas e aranhas lobo. Ao contrário de outras aranhas de vida livre, no entanto, todos os olhos de uma aranha do caranguejo são pequenos e servem principalmente como detectores de movimento. Aranhas caranguejo típicos são predadores que estão à espreita para emboscar suas presas. Apesar de suas quelíceras, ou mandíbula, são bastante pequenas e delgadas, aranhas caranguejo muitos possuem venenos poderosos que rapidamente imobilizar suas presas. Aranhas Flor, um tipo particular de santolas, descanso em flores e permanecer imóvel por longos períodos de tempo com a sua frente dois pares de pernas estendidas em prontidão. Eles emboscada borboletas, abelhas, moscas e outros visitantes florais, os seus venenos que possam atacar com sucesso insetos muito maior do que eles. Eles não se envolver suas presas em seda depois de morder, mas sim permanecer com a vítima imobilizada, até que sugaram o seco.

De acordo com o seu estilo de ataque de emboscada, aranhas caranguejo muitos são bem camuflado, mistura-se com suas origens. Algumas lembram cascas de árvores, folhas ou frutos, outros parecem imitar excrementos das aves. Algumas das aranhas flor são capazes de alterar sua cor durante vários dias, geralmente entre o branco eo amarelo, dependendo da cor da flor em que eles estão descansando. Uma espécie comum norte-americano é a aranha Goldenrod. O caçador barata gigante é uma espécie de clima quente, que muitas vezes se move para o norte, sobre transferências de bananas.

Classificação científica: aranhas caranguejo comum são classificados nas famílias de aranhas e Thomisidae Philodromidae. Aranhas caranguejo gigante, incluindo o caçador de baratas, venatoria Heteropoda, estão na Theridiosomatidae família. A aranha é goldenrod Misumena vatia, Thomisidae família.

Fonte: http://www.everythingabout.net/articles/biology/animals/arthropods/arachnids/spiders/crab_spider/

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Critiques [Translate]

Hello Paulo,

This type of spider has a very vibrant yellow color with an excellent perspective You have displayed.
Details are very distinctive and impressive.
Green funds at the same time as highlighting the picture's eyes are at rest.
And labor in your hand to your health.

Kind regards and greetings
Mehmet

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