We examined the morphology and ultrastructures of fertilized egg envelopes of glowlight tetra (Hemigrammus erythrozonus) belong to Characidae using light and electron microscopes.The fertilized eggs were spherical, transparent, demersal, adhesive, and have no oil droplet. The perivitelline space was well-developed and the micropyle was surrounded by 15–20 uplifted lines of egg envelope in a spoke like pattern. The outer surface of egg envelope was rough side with grooves. Also, the total thickness of the fertilized egg envelope was about 2.1–2.3 μm, and the fertilized egg envelope consisted of two layers, an outer adhesive electron-dense layer with grooves and three feather-like lamellae layers. Collectively, these morphological characteristics of fertilized egg and micropyle with spoke-like structure showed family Characidae specificity, and ultrastructures of outer surface and section of fertilized egg envelope showed species specificity.

中文翻译：

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Hemigrammus erythrozonus, Characidae, Teleostei 受精卵包膜的超微结构

我们用光学和电子显微镜检查了属于Characidae的glowlight tetra（Hemigrammus erythrozonus）受精卵的形态和超微结构。受精卵呈球形、透明、底层、有粘性，无油滴。卵周空间发育良好，微孔周围有 15-20 条呈辐条状突起的卵被膜线。蛋壳外表面粗糙，有凹槽。此外，受精卵壳的总厚度约为 2.1-2.3 μm，受精卵壳由两层组成，外层有凹槽的粘性电子致密层和三个羽毛状薄片层。总的来说，受精卵和具有轮辐状结构的微孔的这些形态特征显示出Characidae科的特异性，