Fig. 11

25-h larva. a Single SBSEM scan through the oblique plane indicated by α in Fig. 10c. The arrowhead points to an oral mesoderm cell. Scale bar = 10 μm. b Single SBSEM scan through the oblique plane indicated by β in Fig. 10c. The arrowheads point to oral mesoderm cells, and the asterisk marks the opening of Hatschek’s nephridium into the pharyngeal lumen. Scale bar = 10 μm. dnc, dorsal nerve cord; ect, ectoderm; fls, first left somite; frs, first right somite; Hn, Hatschek’s nephridium; lpm, lateral plate mesoderm; mo, mouth; no, notochord; pl, pharyngeal lumen; sls, second left somite