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Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head.

Park, Tae-Yoon S. and Kihm, Ji-Hoon and Woo, Jusun and Park, Changkun and Lee, Won Young and Smith, M. Paul and Harper, David A. T. and Young, Fletcher and Nielsen, Arne T. and Vinther, Jakob (2018) 'Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head.', Nature communications., 9 (1). p. 1019.

Abstract

Recent discoveries of fossil nervous tissue in Cambrian fossils have allowed researchers to trace the origin and evolution of the complex arthropod head and brain based on stem groups close to the origin of the clade, rather than on extant, highly derived members. Here we show that Kerygmachela from Sirius Passet, North Greenland, a primitive stem-group euarthropod, exhibits a diminutive (protocerebral) brain that innervates both the eyes and frontal appendages. It has been surmised, based on developmental evidence, that the ancestor of vertebrates and arthropods had a tripartite brain, which is refuted by the fossil evidence presented here. Furthermore, based on the discovery of eyes in Kerygmachela, we suggest that the complex compound eyes in arthropods evolved from simple ocelli, present in onychophorans and tardigrades, rather than through the incorporation of a set of modified limbs.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1038/s41467-018-03464-w
Publisher statement:Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Date accepted:15 February 2018
Date deposited:09 March 2018
Date of first online publication:09 March 2018
Date first made open access:09 March 2018

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