Eyes covered by mitochondrial lenses in Petaliella spiracauda and Ptychopera purasjokii (Plathelminthes, Rhabdocoela, Trigonostominae). Ultrastructural features and phylogenetic implications.

B Sopott-Ehlers, U Ehlers
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Abstract

The submicroscopic anatomy of the eyes in Petaliella spiracauda and Ptychopera purasjokii is described. These eyes correspond in general to the basic pattern of rhabdomeric pigment-cup ocelli. This, however, does not apply to modifications of the cup cell such as the differentiation of mitochondrial lenses. Corresponding with two sensory cells two extensions of the cup cell capping the eye aperture are crowded with small unmodified mitochondria in the eyes of P. spiracauda. The eyes of P. purasjokii have three sensory cells and the lenticular element is formed by a trifoil-shaped differentiation of three giant mitochondrial derivatives. These derivatives show peripheral appendages of various configurations, all of which resemble the profiles of small mitochondria. The implication of the existence of such appendages is that the lenses in P. purasjokii are derived from many fused mitochondria, rather than from a single enlarged one. It is concluded that the unmodified or modified mitochondrial differentiations in proliferations of the pigment cell capping the opening of the eye cup serve to focalize incoming light. The evolution of mitochondrial lenses in Plathelminthes is considered.

螺旋体Petaliella spiracauda和Ptychopera purasjokii的眼睛被线粒体透镜覆盖(platelmintes, Rhabdocoela, Trigonostominae)。超微结构特征及其系统发育意义。
本文描述了螺旋藻和斑蝶眼睛的亚显微解剖结构。这些眼睛大体上符合横纹肌色素杯状眼的基本模式。然而,这并不适用于杯状细胞的修饰,如线粒体晶状体的分化。与两个感觉细胞相对应的是,在螺旋体的眼睛中,盖住眼孔的杯状细胞的两个延伸部分挤满了小的未修饰的线粒体。P. purasjokii的眼睛有三个感觉细胞,透镜细胞是由三个巨大的线粒体衍生物的三叶状分化形成的。这些衍生物显示出各种结构的外围附属物,所有这些附属物都类似于小线粒体的轮廓。这种附属物存在的含义是,P. purasjokii的透镜来自许多融合的线粒体,而不是来自一个扩大的线粒体。由此得出结论,未修饰或修饰的线粒体分化在覆盖眼杯开口的色素细胞增殖中起聚焦入射光的作用。本文讨论了薄鳍动物线粒体晶状体的进化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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