Embryonic development of Proreus simulans (Chelisochidae), DAPI staining, UV-excitation, fluorescence microscopy. Lateral view, anterior to the top, ventral to the left. A Stage 1. B Stage 2. C Stage 3. D Early Stage 5. E Late Stage 5. F Early Stage 6. G Late Stage 6. H Early Stage 7. I Middle Stage 7. J Late Stage 7. K Early Stage 8. L Late Stage 8. M Stage 9. – Abbreviations: Ab – abdominal region / abdomen; Am – amnion; An – antenna; Bd – blastoderm; Ce – cercus; CN – cleavage nucleus; DDC – definitive dorsal closure; EA – embryonic area; EEA – extraembryonic area; Gn – gnathal region; HC – head capsule; HL – head lobe; Lb – labium; LbP – labial palp; LP – lateral plate; Md – mandible; Mx – maxilla; MxP – maxillary palp; PDC – provisional dorsal closure; SDO – secondary dorsal organ; Se – serosa; SYN – secondary yolk nucleus; Th – thoracic region / thorax; Th2 – 2nd thoracic segment; Th1 – 1st thoracic leg; I–XI – 1st to 11th abdominal segments. – Symbols: black arrowhead – anterior end of embryo; white arrowhead – posterior end of embryo. – Scale bar: 500 μm.