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Light-induced and circadian changes in the compound eye of the haematophagous bug Triatoma infestans (Hemiptera: Reduviidae)

Carolina E. Reisenman*, Teresita C. Insausti and Claudio R. Lazzari{ddagger}

Laboratorio de Fisiología de Insectos, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
* Present address: ARL Division of Neurobiology, University of Arizona, PO Box 210077, Tucson, AZ 85721-0077, USA



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  		Fig. 1. Schematic representation of a dark- (left) and a light- (right) adapted ommatidium of Triatoma infestans. Transverse sections at different levels of the light-adapted ommatidium are also shown on the far right. bm, basal membrane; Co, cornea; Cc, crystalline cone; N, nucleus of the retinula cell; PPC, primary pigment cell; S, sphaeroid; SPC, secondary pigment cell; R, retinula cell; rh, rhabdomere; Rp, retinal pigment.

 


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  		Fig. 2. Longitudinal (left) and transverse (right) sections of eyes of Triatoma infestans kept in LD conditions (140 µW cm–2:0 µW cm–2) and fixed during the day (A,B) and during the night (C,D). Co, cornea; Cc, crystalline cone; PPC, primary pigment cell; SPC, secondary pigment cell; rh, rhabdomere; Rp, retinal pigment. Scale bars: 25 µm (A,B), 30 µm (C), 50 µm (D).

 


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  		Fig. 3. Longitudinal (left) and transverse (right) sections of eyes of Triatoma infestans kept in DD conditions and fixed during the subjective day (A,B) and during the subjective night (C,D). Co, cornea; Cc, crystalline cone; PPC, primary pigment cell; SPC, secondary pigment cell; rh, rhabdomere; Rp, retinal pigment. Scale bars, 25 µm.

 


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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).

 


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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).

 




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