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Pistol Shrimp and Goby Symbiosis
Some species of pistol shrimps...

Pistol Shrimp and Goby Symbiosis<br/>Some species of pistol shrimps... | Environmental Science | Scoop.it
Pistol Shrimp and Goby Symbiosis Some species of pistol shrimps and of Goby fishes share a close symbiotic relationship, living together in the same burrow The shrimp builds and maintains the burrow, which is inhabited by both the fish and the...

Via Luisa Meira
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Mantis shrimps have the world's best eyes equipped with 16 different types of photo receptors

Mantis shrimps have the world's best eyes equipped with 16 different types of photo receptors | Environmental Science | Scoop.it
As humans, we experience an amazing world of colour, but what can other animals see? Some see much more than us, but how they use this vision is largely unknown.

 

We see what we see because our eyes have three photoreceptors, red, green and blue. Our vision is good compared to dogs which have only two photoreceptors (green and blue), but is nothing compared to many birds who have four photoreceptors: ultraviolet (UV) as well as red, green and blue.

The addition of a UV photoreceptor is hard to imagine, but if we consider invertebrate vision it gets even more mind-boggling. Butterflies have five photoreceptors, providing them with UV vision and an enhanced ability to distinguish between two similar colors.

Octopuses do not have color vision but they can detect polarized light. The closest humans come to seeing polarized light is by wearing polarized sunglasses.

But this is not the end of the story. Mantis shrimp vision puts everything else to shame. These marine crustaceans may be well-known for their record breaking punch (the same acceleration as a .22 calibre bullet), but they also hold the world record for the most complex visual system. They have 16 photoreceptors and can see UV, visible and polarized light and probably much more. In fact, they are the only animals known to detect circularly polarized light, which is when the wave component of light rotates in a circular motion. They also can perceive depth with one eye and move each eye independently. It's impossible to imagine what mantis shrimp see and incredible to think about.

Mantis shrimp have compound eyes that are made up of tens of thousands of ommatidia (elements containing a cluster of photoreceptor cells, support cells and pigment cells) much like flies. In the species with spectacular vision, Gonodactylids and Lysiosquillids, the middle of the eye has six rows of modified ommatidia called the mid-band. This is where the magic happens.


Via Dr. Stefan Gruenwald
Non's insight:

Imagining a color you can't Imagine is hard

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