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Fig. 5. Photoreceptor cells of the tick I. ricinus. (A) Optical and electron microscopical examination of larval (L), nymphal (N), adult male (M) and adult female (F) I. ricinus revealed 20–21 bilaterally arranged photoreceptors, each placed dorsolaterally posterior to coxa 2; axons from the photoreceptor cells form the optic nerves (ON) that pass antero-laterally to reach the synganglion (SYN) rostrally; S, spiracle. (B) Photoreceptors (1–10) of a larva, located immediately below the cuticle (CU) and the hypodermis (HY). (C) A larval photoreceptor cell containing a major rhabdomere (R), attached to the hypodermis (HY), lysosome (L), mitochondria (M) and nucleus (N).





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