How mantis shrimp see

Divide one compound eye into regions

Thousands of ommatidia form each stalked eye, but they are not all equivalent. Dorsal and ventral hemispheres view overlapping space, while a conspicuous equatorial midband contains two or six specialized rows in different stomatopod groups. Because multiple regions of one eye can inspect the same strip, a single eye can obtain depth-related information, and two eyes can move largely independently. [1][4]

Tune channels with pigments and filters

Photoreceptor pigments establish basic spectral sensitivity, while colored intrarhabdomal, lateral, and ultraviolet filters narrow or shift the light reaching particular cells. The exact receptor set varies by species and can adapt to habitat light. Some well-studied mantis shrimps possess around a dozen spectral classes across ultraviolet and visible ranges, an anatomical diversity rare among animals. [1][2]

Do not equate channel count with precision

Behavioral tests found surprisingly coarse discrimination between nearby wavelengths despite the many spectral receptor classes. One interpretation is a labeled-line strategy in which channels trigger categories with less neural comparison, trading fine hue judgments for speed. The result directly challenges the popular claim that mantis shrimps necessarily see more finely graded color than every other animal. [1][3]

Rotate receptors into polarized light

Microvilli in different eye regions are oriented to analyze the angle of linear polarization, and specialized midband structures in some species support circular-polarization sensitivity. Mantis shrimps roll their eyes as well as pitching and yawing them. Experiments show those torsional movements can align receptors with a polarized target and improve contrast, making eye motion an active part of sensing rather than mere gaze stabilization. [2][4]

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