|[Note Guidelines] Photographer's Note|
Misumena vatia is a species of crab spider with holarctic distribution. In North America, where it is the largest and best-known flower spider, it is called the goldenrod crab spider or flower (crab) spider, because it is commonly found hunting in goldenrod sprays in the autumn.
Young male, imitating a flowerYoung males in the early summer may be quite small and easily overlooked, but females can grow up to 10 mm (excluding legs); males reach 5 mm at most.
These spiders may be yellow or white, depending on the flower in which they are hunting. Especially younger females, which may hunt on a variety of flowers such as daisies and sunflowers, may change color "at will". Older females require large amounts of relatively large prey to produce the best possible clutch of eggs.The much smaller males scamper from flower to flower in search of females and are often seen missing one or more of their legs. This may be due either to near misses by predators such as birds or to fighting with other males.When a male finds a female, he climbs over her head over her opisthosoma onto her underside, where he inserts his pedipalps to inseminate her.
The young reach a size of about 5mm by autumn and spend the winter on the ground. They molt for the last time in May of the next year.
These spiders change color by secreting a liquid yellow pigment into the outer cell layer of the body. On a white base, this pigment is transported into lower layers, so that inner glands, filled with white guanine, become visible. If the spider dwells longer on a white plant, the yellow pigment is often excreted. It will then take the spider much longer to change to yellow, because it will have to produce the yellow pigment first. The color change is induced by visual feedback; spiders with painted eyes were found to have lost this ability.The color change from white to yellow takes between 10 and 25 days, the reverse about six days.
my mood today for "That's The Way Of The World" -Earth, Wind & Fire
Make: NIKON CORPORATION
Model: NIKON D90
Software: Adobe Photoshop CS4 Windows
Exposure Time: 1/30 sec
Focal Length: 150/1 mm
Date Taken: 2011-05-24 19:05
Metering Mode: Center Weighted Average
File Size: 240 kb
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- [2011-06-11 4:57]
Excellent macro good colours and details.
qualcosa di simile ha presentato anche Ivan, dal punto di vista dei colori sembra un perfetto mimetismo, ma a noi pare di riconoscere con facilitÓ la sua presenza, credo che non si tratti di mimetismo nel senso di come lo concepiamo spesso noi, in realtÓ il ragno sfrutta l'eventuale passaggio d'insetti che salgono lungo lo stelo, segno che forse non ci sono fiori pronti per attirare insetti che volano, personalmente ho osservato che questi ragni si collocano sui fiori che in quel momento attirano gli insetti, immagine fantastico per colori e composizione
Grazie e complimenti
Buona serata e buona domenica
Capolavoro! ... Bravo!