Embryonic development.

<p>(<b>A</b>) Fragment of a young embryo (cross section; blastoderm stage) developing inside a terminal ovarian follicle. DAPI staining. Note that the nuclei of follicular cells (fc) are substantially larger and “brighter” than blastoderm nuclei (bl). Yolk nuclei (yn). FM, scale bar: 24 µm. (<b>B, C</b>) Fragment of an older embryo (cross section; germ band stage) inside a terminal follicle. Note the germ band (gb) surrounded by the follicular epithelium (fc) and two embryonic envelopes, serosa (s) and amnion (a). The follicular epithelium is separated from the embryo by a thin structureless eggshell (arrowheads). LM, scale bar: 24 µm. (<b>D</b>) Posterior part of the embryo dissected from the lumen of the uterus. Note well developed cerci (ce) and the last abdominal segment (telson, t). SEM, scale bar: 0.5 mm. (<b>E</b>) Follicular cell (fragment) surrounding the blastoderm stage embryo. Note highly folded envelope surrounding irregularly shaped nucleus (n) and large secretory vacuoles (v). TEM, scale bar: 1 µm.