Ova of Sinobirma bouyeri. A Lateral view, scale bar = 400 µm; a: micropylar side; b: non-micropylar side. B Non-micropylar side, vertical view, scale bar = 350 µm. C Micropylar side, vertical view, scale bar = 350 µm; a: micropylar zone. D A part of exochorion in the non-micropylar area, scale bar = 40 µm. E Aeropyle, scale bar = 4 µm. F Aeropyle, scale bar = 3 µm. G Micropylar zone, scale bar = 20 µm; a: central area; b: foreign matter.