ocellus

…An eye with a simple structure different from the compound eyes seen in adult insects, or the eyes of insect larvae that undergo complete metamorphosis, is called an ocellus (plural ocelli). The adult ocelli is also called the dorsal ocellus, and the larval ocelli is also called the lateral ocellus. …

*Some of the terminology that mentions "ocellus" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…昆虫の成虫にみられる複眼とは異なる簡単な構造の眼や，完全変態する昆虫の幼虫の眼を単眼ocellus(複数形はocelli)という。成虫単眼は背単眼dorsal ocellus，幼虫単眼は側単眼lateral ocellusともいう。…

※「ocellus」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報