Fig. 3

The hatching line in the serosal cuticle. a A TEM image of the anterodorsal cleavage site of a hatched eggshell. Blue and red arrowheads indicate the cleavage sites in the chorion and serosal cuticle, respectively. b A schematic representation of the inner surface structure of the anterodorsal part of the eggshell. c-e Interior SEM images of the eggshell of the fully developed eggs at the represented sites shown in (b). A furrow (orange arrowheads) flanked by two ridges (yellow arrowheads) runs along the midline of the anterior part. Abbreviations: Ch, chorion; SC, serosal cuticle