Eggs of Diplatys flavicollis (Diplatyidae) in Stage 3. A, A’ Egg in early Stage 3, DAPI staining, UV-excitation, fluorescence microscopy. A Lateral view, anterior to the top, ventral to the left. A’ Ventral view, anterior to the top. B–B’’ Egg in early-middle Stage 3, DAPI staining, UV-excitation, fluorescence microscopy. B Lateral view, anterior to the top, ventral to the left. B’ Ventral view, anterior to the top. B’’ Posterior view. C–C’’’ Egg in middle-late Stage 3, DAPI staining, UV-excitation, fluorescence microscopy. C Lateral view, anterior to the top, ventral to the left. C’ Ventral view, anterior to the top. C’’ Posterior view. C’’’ Dorsal view, anterior to the top. D–D’’’ Egg in late Stage 3, DAPI staining, UV-excitation, fluorescence microscopy. D Lateral view, anterior to the top, ventral to the left. D’ Ventral view, anterior to the top. D’’ Posterior view. D’’’ Dorsal view, anterior to the top. E, E’ Transverse section of an egg in early-middle Stage 3, ventral to the bottom. E’ Enlarged image of the boxed area in E. – Abbreviations: EA – embryonic area; EEA – extraembryonic area; Em – embryo; LP – lateral plate; MP – median plate; Pce – protocephalon; Pco – protocorm; PG – primitive groove; Se – serosa; SYN – secondary yolk nucleus. – Scale bars: A, A’, B–B’’, C–C’’’, D–D’’’ – 500 μm; E – 100 μm; E’ – 50 μm.