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Olfactory pore plate measurements. (a) Scanning electron microscope image of a pore plate (sensillum placodea) on a T. angustula antenna. (b) Light microscope image of a segment of a T. angustula antenna with elliptical pore plates. We counted the pore plates (bright areas of elliptical shape) that were completely or partly inside the white circle (50 µm radius) on segments 1–7 on both antennae. (Online version in colour.)
