Takenaka Makoto, Suzuki Akiko, Yamamoto Takashi, Yamamoto Masamichi, Yoshida M
Ushimado Marine Laboratory, Okayama University, Ushimado, Okayama 701-43, Japan.
Dev Growth Differ. 1993 Jun;35(3):245-255. doi: 10.1111/j.1440-169X.1993.00245.x.
The planktonic barnacle larva has a single median ocellus (nauplius eye), while the adult possesses two distinct sets of photoreceptors; a pair of lateral ocelli and a single median ocellus. The nauplius eye of the cypris larva of Balanus amphitrite hawaiiensis is composed of 14 visual cells grouped into three components (a pair of lateral components and a single ventral component) surrounding two centrally located pigment cells; each lateral component consists of 5 visual cells and the ventral component, 4 visual cells. In each component, the rhabdom is made up of apposing microvilli arising directly from the neighboring visual cell bodies. During metamorphosis into the adult form, the three components of the median ocellus become separated. Each lateral component migrates laterally on the mantle and is remodeled into the adult lateral ocellus, losing two visual cells but gaining new pigment and tapetum cells in the process. The ventral component remains in the mid portion and becomes the adult median ocellus without fundamental modification in composition. The visual cells in both ocelli undergo a marked increase in volume and form many finger-like dendrites. Rhabdomes are made up of interdigitating microvilli arising from the the dendrite tips.
浮游藤壶幼虫有一个单眼中眼（无节幼虫眼），而成体有两组不同的光感受器；一对侧眼和一个单眼中眼。夏威夷互敬藤壶（Balanus amphitrite hawaiiensis）的金星幼虫的无节幼虫眼由14个视觉细胞组成，分为三个部分（一对侧部和一个单一的腹侧部分），围绕着两个位于中心的色素细胞；每个侧部由5个视觉细胞组成，腹侧部分由4个视觉细胞组成。在每个部分中，视杆由直接来自相邻视觉细胞体的相对微绒毛组成。在变态为成体形式的过程中，中眼的三个部分分开。每个侧部在壳膜上横向迁移并重塑为成体侧眼，在此过程中失去两个视觉细胞，但获得新的色素和反光细胞。腹侧部分保留在中部并成为成体中眼，其组成没有根本性改变。两个眼中的视觉细胞体积显著增加，并形成许多指状树突。视杆由来自树突尖端的交叉微绒毛组成。
