eLife Assessment
The study is a valuable contribution to the question of evolutionary shifts in neuronal proliferation patterns and the timing of developmental progressions. The authors present convincing data which confirm the presence of type-II NB lineages in beetle with the same molecular characteristics as the Drosophila counterparts but differing in lineage size and number. The data lay the foundation for future analysis of the role and molecular characteristics of individual lineages and of whether differences in the identity, proliferation pattern and timing of developmental progression can be linked to differences in the development of functionality of the central complex.