Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head
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- Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head
- Other Titles
- 케리그마켈라의 두뇌와 눈모양을 통한 범절지동물의 두뇌모양 규명
- Park, Tae-Yoon S.
Arne Thorshøj Nielsen
David A.T. Harper
M. Paul Smith
Lee, Won Young
- Cambrian; Euarthropod; Evolution; Greenland
- Issue Date
- Park, Tae-Yoon S., et al. 2018. "Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head". NATURE COMMUNICATIONS, 9: 1019-NaN.
- Recent discoveries of fossil nervous tissue in Cambrian fossils have enabled tracing 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 Q1 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 Q2 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
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