The rhabdomeres of retinular cells (R1 - 6) in the medial-dorsal region of the compound eye of Bactrocera dorsalis Hendel twist along their length were examined by electronmicroscopy. The 2 groups of rhabdomeres, R1 - 3 and R4 - 6, twist in mirror-image directions. The twisting degree of microvilli of the rhabdomeres could be divided into three regions; region I: it was located at about 0 - 84 ± 5μm below the crystalline cone, their twisting rate were between 0.226 - 0.464° /μm, region II: about 84 - 110 ± 5μm below crystalline cone, twisting rate between 1.606 - 5.28°μm, region III: about 110 - 160 ± 5μm, twisting rate between 0.09 - 0.659° /um.
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