Comment on The lower Cambrian lobopodian Cardiodictyon resolves the origin of euarthropod brains

Strausfeld et al. (Report, 24 Nov 2022, p. 905) claim that Cambrian fossilized nervous tissue supports the interpretation that the ancestral panarthropod brain was tripartite and unsegmented. We argue that this conclusion is unsupported, and developmental data from living onychophorans contradict it.

Automated summary

Strausfeld et al. claim that fossilized nervous tissue from the Cambrian period supports the idea that the ancestral panarthropod brain was tripartite and unsegmented. However, we argue that this conclusion is not supported by evidence, and developmental data from living onychophorans contradict it.