Ultrastructure of the compound eyes in the hangingfly Bittacus planus Cheng (Mecoptera: Bittacidae)

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Abstract

The ultrastructure of the apposition eyes in the hangingfly Bittacus planus Cheng was investigated using transmission electron microscopy. The compound eyes are composed of approximately 1000 contiguous ommatidia, each of which consists of a biconvex cornea, a crystalline cone, eight retinula cells, two primary pigment cells, and 12 secondary pigment cells. The rhabdom is of fused-type and formed by the rhabdomeres from eight retinula cells that run from the cone to the basal lamina, although the rhabdomere from the basal retinula cell (R8) only contributed to the lowest part of the rhabdom. The pigment granules are spread evenly in the primary pigment cells but are concentrated at the proximal and distal ends in the secondary pigment cells, and close to the rhabdom in retinula cells. The rhabdom is peculiar for the presence of gaps at the outer corner of each two adjoining rhabdomeres in different levels of retinula cell except for the proximal zone. © 2010 Elsevier Ltd.

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Wei, Y., Hua, B., & Yan, G. (2010). Ultrastructure of the compound eyes in the hangingfly Bittacus planus Cheng (Mecoptera: Bittacidae). Micron, 41(8), 953–959. https://doi.org/10.1016/j.micron.2010.07.005

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