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Fig. 2. Scanning electron microscopy images of Blattella germanica oothecae. (A) Distal end of an ootheca. Scale bar, 0.25 mm. (B) Proximal end of an ootheca showing the `escutcheon-shaped' vaginal imprint (arrow). (C) Magnification of the ventro-lateral escutcheon region (arrow indicates the `pore-field' area). (D) Magnification of `pore-field' (arrow). (E-G) Increasing magnification of the pore field area shown in D (H,I) Pores (arrows) revealed on the internal surface of the oothecal covering after chorion removal using trypsin. The pore sizes are approximately 1-2 µm in diameter.