Prociv P
Department of Parasitology, University of Queensland, St. Lucia, Australia.
J Helminthol. 1990 Dec;64(4):271-7. doi: 10.1017/s0022149x00012281.
Fertile eggs of Toxocara pteropodis, passed in the faeces of juvenile flying-foxes, were ovoid to spheroid in shape with a diameter range of 80-110 microns. The shell was often seen to comprise 4 layers: a fine inner lipid layer, a thicker clear chitinous layer, an equally thick outer vitelline layer and a pitted outermost, proteinaceous uterine layer of variable thickness. Infertile eggs were less uniform in shape and generally did not have well-defined shell layers, the formation of which is triggered by sperm penetration of the oocyte. The eggs of this species are bulkier than those of related ascaridoids, apparently because of a thicker external coat which, while not providing mechanical strength, is thought to protect against desiccation. Scanning electron microscopical findings suggest that the outer layer is not applied directly by uterine cells, but forms by the gradual deposition of secretions in the uterine lumen, regardless of whether the oocyte has been fertilized.
从幼年狐蝠粪便中排出的翼手目弓首蛔虫的受精卵呈卵形至球形，直径范围为80 - 110微米。卵壳通常可见由4层组成：一层薄的内脂质层、一层较厚的透明几丁质层、一层同样厚的外卵黄层以及最外层有凹坑的、厚度可变的蛋白质子宫层。未受精卵形状较不规则，通常没有界限分明的壳层，壳层的形成是由精子穿透卵母细胞触发的。该物种的卵比相关类蛔虫的卵更大，显然是因为其外层较厚，虽然这层外层不提供机械强度，但被认为可以防止干燥。扫描电子显微镜观察结果表明，外层不是由子宫细胞直接施加的，而是由分泌物在子宫腔内逐渐沉积形成的，无论卵母细胞是否已受精。
