Figure 12

Cell counts in walking leg neuromere 1 of Pseudopallene sp. (late ES 2 – ES 10). Each bar stands for an analysed specimen. Immigrating cells with basally displaced nucleus as well as already detached neural cells (including all types of NPs) are shown in dark red. Cells with apical nucleus during early neurogenesis are labelled in yellow. Cells at the rim of the central invagination with unclear epidermal or neural fate are shown in green. (A) Overview of counted cell numbers per hemi-neuromere over the course of development. Note the slow increase of immigrating/detached GCs up to ES 6 and their still considerable increase during the second phase of embryonic neurogenesis. (B–E) Spots-model of selected hemi-neuromere counts of different developmental stages. Ventral view shown to the left, medial view to the right. Note hemi-neuromere compaction along the medio-lateral axis during development (B–D). During the second phase of embryonic neurogenesis, the apico-basal extension of formed hemi-ganglion anlage increases dramatically (D,E).