Fig. 1 in Towards a ground pattern reconstruction of bivalve nervous systems: neurogenesis in the zebra mussel Dreissena polymorpha

Fig. 1 Development of Dreissena polymorpha from gastrula to early veliger stage. a, g, h, and i Scanning electron micrographs. b, c Confocal microscope Zprojection images. d, e, and f Single optical sections of c. Acetylated α-tubulin-lir (green), HCS CellMask (pink), and cell nuclei counter staining (blue). Apical is always up. Lateral views. Scale bars are 15 μm. a Ciliated gastrula stage (16 h post fertilization, hpf) with blastopore (bp) on the vegetal pole. b Elongated early trochophore (22 hpf) with prominent apical tuft (at) and prototroch (pt). c Early-trochophore (23 hpf) with apical tuft (at), prototroch (pt), and telotroch (tt). d Early trochophore (23 hpf). e, f Early trochophore (23 hpf) in different optical planes with foregut (fg) and shell field (sf) invagination. g Early veliger (39 hpf) with embryonic shell (s) and expanded velum (ve). h 46 hpf old veliger. i Late veliger larva (188 hpf)