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Fig. 5. (A,B) Longitudinal sections of eyes of Triatoma infestans kept in LD conditions (8 µW cm–2:0 µW cm–2) and fixed during the day (A) and during the night (B). (C,D) Longitudinal sections of eyes of insects kept in LL conditions (8 µW cm–2) and fixed during the subjective day (C) and during the subjective night (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,C), 30 µm (B,D).