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FIGURE 6 - The evolutionary and genetic origins of consciousness in the Cambrian Period over 500 million years ago

| Haikouichthys. (A) Artist's rendering of what Haikouichthys looked like. (B) Fossil of this animal with an eye and otic capsule ("Auditory vesicle") labeled. Haikouichthys is agreed to have been a true vertebrate, a jawless fish, and it shows vertebral elements (protovertebrae), prominent eyes, and nasal capsules (Shu, 2003; Shu et al., 2003, 2009). From Figure 146 in Chen (2012) Springer. Reprinted with kind permission from Springer Science+Business Media B.V.
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