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Phintella Jumping Spider

Phintella sp.

Description:

A beautiful male jumper from probably from genus Phintella I had spotted in Khao Sok rainforest. Jumping spiders have four pairs of eyes; three secondary pairs that are fixed and a principal pair that is movable.The anterior median eyes (AME) have very good vision. This pair of eyes is built like a telescopic tube with a corneal lens in the front and a second lens in the back that focus images onto a four-layered retina, a narrow boomerang-shaped strip oriented vertically. Physiological experiments have shown they may have up to four different kinds of receptor cells, with different absorption spectra, giving them the possibility of tetrachromatic color vision, with sensitivity extending into the ultraviolet range. As the eyes are too close together to allow depth perception, and the animals do not make use of motion parallax, they have evolved a method called image defocus instead. Of the four photoreceptor layers in the retina, the first two closest to the surface contain ultraviolet-sensitive pigments while the two deepest contain green-sensitive pigments. The incoming green light is only focused on the deepest layer, while the other one receives defocused or fuzzy images. By measuring the amount of defocus from the fuzzy layer, it is possible to calculate the distance to the objects in front of them.In addition to receptor cells, also red filters have been detected, located in front of the cells that normally register green light.It seems that all salticids, regardless of whether they have two, three, or four kinds of color receptors, are highly sensitive to UV light.Some species (for example, Cosmophasis umbratica) are highly dimorphic in the UV spectrum, suggesting a role in sexual signaling (Lim & Li, 2005). Color discrimination has been demonstrated in behavioral experiments.

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2 Comments

Ashutosh Dudhatra
Ashutosh Dudhatra 7 months ago

Thank you!

“Your spotting has been nominated for the Spotting of the Week. The winner will be chosen by the Project Noah Rangers based on a combination of factors including: uniqueness of the shot, status of the organism (for example, rare or endangered), quality of the information provided in the habitat and description sections. There is a subjective element, of course; the spotting with the highest number of Ranger votes is chosen. Congratulations on being nominated!”

Ashutosh Dudhatra
Spotted by
Ashutosh Dudhatra

จังหวัดสุราษฎร์ธานี, Thailand

Spotted on Jan 14, 2020
Submitted on Jan 14, 2020

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