Side-by-side schematic drawings of the brains of horseshoe crab, Mollisonia and a modern spider (IMAGE)

University of Arizona

Side-by-side schematic drawings of the brains of horseshoe crab, Mollisonia and a modern spider

Caption

A side-by-side comparison of the brains of a horseshoe crab (left), the Mollisonia fossil (center) and a modern spider (right) reveal the surprising findings of this study: The organization of Mollisonia's three brain regions (green, magenta and blue) are inverted when compared to the horseshoe crab, and instead resemble the arrangement found in modern spiders. 

Credit

Nick Strausfeld

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