Denys C J, Adamian M, Brown P K
Tissue Cell. 1983;15(1):77-95. doi: 10.1016/0040-8166(83)90035-6.
The compound eye of the Antarctic euphausiid Euphausia superba is a spherical clear zone eye. The dioptric system consists of a hexagonally-faceted cornea, two corneagenous cells, two crystalline cone cells which form the bipartite crystalline cone, and two accessory cone cells. The dioptric system of each ommatidium is separated from that of adjacent ommatidia by six distal pigment cells and a basement membrane. The proximal tip of the crystalline cone is cupped by the distal ends of the seven retinula cells whose nuclei are arranged in a staggered array slightly distal to the middle of the clear zone. In the distal half of the clear zone, each narrow retinula cell column is surrounded by large proximal extensions of the six distal pigment cells. The pigment cells narrow more proximally and terminate at the proximal basement membrane. A specialized axial channel complex extends from the crystalline cone through the clear zone, and is continuous with a conical refractive element which caps the distal end of the rhabdom. The rhabdom is fused, and made up of alternating highly birefringent layers of orthogonally-oriented microvilli. It is surrounded by a narrow extra-cellular space which is continuous with the distal refractive element and a second conical refractive element at the proximal end of the rhabdom.
南极磷虾（Euphausia superba）的复眼是一种球形透明区眼。屈光系统由六边形小面角膜、两个角膜生成细胞、两个形成二分晶锥的晶锥细胞以及两个辅助晶锥细胞组成。每个小眼的屈光系统通过六个远端色素细胞和一层基底膜与相邻小眼的屈光系统分隔开。晶锥的近端尖端被七个小网膜细胞的远端包围，这些细胞的细胞核呈交错排列，位于透明区中部稍远的位置。在透明区的后半部分，每个狭窄的小网膜细胞柱被六个远端色素细胞的大近端延伸部分包围。色素细胞在近端变窄并终止于近端基底膜。一个特殊的轴向通道复合体从晶锥延伸穿过透明区，并与一个覆盖视杆远端的圆锥形折射元件相连。视杆是融合的，由交替排列的高度双折射的正交微绒毛层组成。它被一个狭窄的细胞外空间包围，该空间与远端折射元件以及视杆近端的第二个圆锥形折射元件相连。
