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

• DOI: 10.1038/s41467-018-03464-w
• Publication Date: 2018-03-05T16:15:13Z
• Authors: Tae-Yoon S. Park; Ji-Hoon Kihm; Jusun Woo; Changkun Park; Won Young Lee; M. Paul Smith; David A. T. Harper; Fletcher Young; Arne T. Nielsen; Jakob Vinther
• Keywords: Arthropod; Endocast; Appendage

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