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Sequence heterochrony in central complex development.

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posted on 26.10.2020, 18:52 by Max S. Farnworth, Kolja N. Eckermann, Gregor Bucher

All schematics are drawn from the preparations shown in the figures of the results section. Stage numbering corresponds to the one in Fig 10. Steps 2 and 4 (median column) occur at similar developmental stages in both species. However, in Tribolium (right panels), steps 5–8 occur before the massive larval expansion of the CX (step 4). In Drosophila, in contrast, the larval expansion (step 4) occurs prior to steps 5–8. As consequence, at the end of embryogenesis, the Tribolium CX already shows WXYZ tracts, decussations, and synapsin staining. This complex structure grows in size in beetle larvae, whereas in Drosophila, a CX primordium of an earlier developmental stage expands. CB, central body; CX, central complex; EB, ellipsoid body; FB, fan-shaped body; NO, noduli.