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Square Pupil.

By Alex in Animal on Nov 12, 2006 at 12:44 pm


Did you know that the freshwater shrimp Macrobrachium amazonicum has a square pupil? Well, now you do, courtesy of Alex H. Griman whose photo won 11th place in the 2006 Nikon Small World microscopy photo contest.

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  1. Nicholas Dollak
    Nov 12th, 2006 at 9:00 pm

    Cool pupil! I've seen squared-off pupils on other animals as well: goats and octopus have rectangular pupils. Octopus pupils remain level with the horizon as the octopus rotates. If you look closely, you'll see that fish eyes have four small lines radiating away from the (circular) pupils at right angles; these reveal that fish eyes swivel to remain level with the horizon as well.

  2. Thief
    Nov 13th, 2006 at 9:36 am

    ¬¬

  3. Fedge
    Dec 4th, 2009 at 5:08 pm

    Great pic!

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