Nervous Systems in Comparison (IMAGE)

University of Arizona

Nervous Systems in Comparison

Caption

This si an illustration of the nervous systems of the Alalcomenaeus fossil (left), a larval horseshoe crab (middle) and a scorpion (right). Diagnostic features revealing the evolutionary relationships among these animals include the forward position of the gut opening in the brain and the arrangement of optic centers outside and inside the brain supplied by two pairs of eyes.

Credit

N. Strausfeld/University of Arizona

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