シャコ複眼の微細構造

概要

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The retinal structure of the compound eye of a mantis crab, Squilla oratoria, was examind by light and electron microscopy. The compound eye is divided into three parts, the anterior portion, the posterior portion and the median narrrow zone of two rows of ommatidia separated from adjacent regions by a layer of screening pigment on either side. In each ommatidium a cuticular lens, a crystalline cone and seven retinula cells enclosing a rhabdom are observed. The extremely long rhabdom is composed of about 100 layers of rhabdomeres or plates of microvillar tublues. These plates, each about 2μ thick, are piled up successively one upon another. The tubules of each plate are arranged at right angles to those of the neighbouring plates. The tubules arise in groups from several processes of retinula cells or stems, and so in some regions narrow spaces are found between the rhabdom membrane and the retinula cell membrane. These features are almost the same with those of Homarus. Some melanine granules are distinguished in stems. It seems characteristic of the eye that numerous crystalline substances (probably reflecting the light) are found in the accessory pigment cell and in the tissues underlying the basement membrane. Vessel-like intercellular space containing free cells like blood corpuscles are seen among accessory pigment cells, penetrating the basement membrane.
社団法人日本動物学会の論文
1972-09-25