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. 2013 Oct 4;4:667. doi: 10.3389/fpsyg.2013.00667

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Copyright © 2013 Feinberg and Mallatt.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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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.