Nature 2012 in press doi 101038nature11495 the eye

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Unformatted text preview: y did it survive? 4 4/12/13 Complex brains evolved QUICKLY One of the most plen?ful fossils is this species, Fuxianhuia protensa Hou, which is omen preserved in stunning detail and in this flaaened posture, required for viewing internal organs 5 4/12/13 Eyestalk posture suggests “active” vision Ma, Hou, Edgecombe & Strausfeld. Nature 2012, in press. DOI 10.1038/nature11495 The eye shows evidence of three distal levels, corresponding to the cornea and crystalline cone of a modern malacostracan. THE BRAIN 6 4/12/13 Correspondence of neuropils in the eyestalk of today’s Nebalia pugettensis and the 535 million year older Fuxianhuia protensa. The lateral protocerebrum (L Pro) and three nested optic neuropils (1-3) beneath the retina (Re). Occasional facet lenses in F. protensa (ringed) correspond to those in N. pugettensis (left panel). Energy-dispersive X-ray spectroscopy show that both the brain and the optic lobes are preserved with high iron concentration compared to surrounding structures. 7 4/12/13 Fuxianhuia protensa shows unambiguous evidence of an advanced malacostracan ­like brain. The protocerebrum is indicated by the op?c tract (op t), the deutocerebrum by the antennal nerve (A1n), and the tritocerebrum by the nerve of the first biramous appendage (A2n). Op?c lo...
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