Evidence that a larval brachiopod has ciliary photoreceptors that are directionally selective, and therefore may function as eyes, bears on an enduring puzzle about photoreceptor evolution in animals.
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Osorio, D. Light sense. Nature 472, 300–301 (2011). https://doi.org/10.1038/472300a
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DOI: https://doi.org/10.1038/472300a