Sherk T E
J Exp Zool. 1978 Feb;203(2):183-200. doi: 10.1002/jez.1402030202.
The changes in the directions of view of marked larval ommatidia were observed after the emergence of the adult. Those ommatidia that had been present during the first larval instar had the most posterior directions of view in the adult visual field while the newest ommatidia that had not been functional for vision in the aquatic larva contributed to the anterior and dorsal foveas of the aerial adults. The changes in interommatidial angles at emergence are discussed. Contrary to the general trend for interommatidial angles between retained larval ommatidia to decrease at emergence, the interommatidial angles in the larval fovea of aeshnid visual predators increase at emergence. The modifications in an odonate compound eye at emergence are like an exaggeration of the modifications that occur at the moult from one larval instar to the next, except that the newest ommatidia do not have any compromises in their design for use in the aquatic vision of the larvae. This is in contrast to the ommatidia retained from the earliest larval instars which have to have the most compromises in their design so that they can be adapted for the visual requirements of every larval instar, as well as the adult. This is discussed in relation to the trend among advanced species of odonates to replace the larval ommatidia by an entirely new set of adult ommatidia.
在成虫羽化后，观察了有标记的幼虫小眼视野方向的变化。那些在幼虫第一龄期就已存在的小眼，在成虫视野中具有最靠后的视野方向，而那些在水生幼虫期未用于视觉功能的最新小眼，则构成了陆生成虫的前凹和背凹。讨论了羽化时小眼间角度的变化。与保留的幼虫小眼之间的小眼间角度在羽化时通常减小的趋势相反，豆娘视觉捕食者幼虫凹中的小眼间角度在羽化时增大。羽化时豆娘复眼的变化类似于从一个幼虫龄期到下一个幼虫龄期蜕皮时发生的变化的夸张，只是最新的小眼在设计上没有任何用于幼虫水生视觉的妥协。这与最早幼虫龄期保留的小眼形成对比，后者在设计上必须有最大的妥协，以便它们能够适应每个幼虫龄期以及成虫的视觉需求。这是结合豆娘高级物种中用全新的成虫小眼取代幼虫小眼的趋势来讨论的。
