Two "great appendage" arthropods and their reconstructed brains (IMAGE)
Caption
Two "great appendage" arthropods and their reconstructed brains: Alalcomenaeus (left) is at the root of Chelicerata, which includes scorpions, spiders, and their relatives. Jianfengia (right) is shown to be basal to Mandibulata, the group that includes crustaceans, insects, centipedes and millipedes, according to the new study. The findings challenge the traditional grouping of the two as related based on their pincer-like ‘great appendages’ that extend from their heads.
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Nick Strausfeld, University of Arizona
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