Micropylar region and mucous layer. (A) At the one-cell stage, the micropylar region is surrounded by the filament tuft. (B, C) The mucous layer adheres the eggs to the substrate and/or to one another at low (B) and high magnification (C). Abbreviations: ch, chorion; mi, micropyle; ft, filament tuft; ml, mucous layer. Scale bar = 500 μm.