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Fig. 4. Longitudinal (left) and transverse (right) sections of eyes of Triatoma infestans kept in LL conditions and fixed during the subjective day (A,B) and during the subjective night (C,D). Co, cornea; Cc, crystalline cone; N, nucleus of the retinula cell; PPC, primary pigment cell; S, sphaeroid; SPC, secondary pigment cell; rh, rhabdomere; Rp, retinal pigment. Scale bars: 25 µm (A), 30 µm (B,C), 20 µm (D).