Riehl R
Cell Tissue Res. 1980;205(2):289-94. doi: 10.1007/BF00234686.
The ovaries of more than 100 adult nulliparous females of the poeciliid Heterandria formosa were investigated by light- and electronmicroscopy. Among these females two hermaphroditic specimens were found. The gonads of the hermaphrodites do not differ externally from those of normal females. In semithin and ultrathin sections female and male parts of the gonad can be distinguished. The female parts are very dominant. The oocytes of the hermaphroditic gonads are in the stage of vitellogenesis. They are enveloped by a thin zona radiata. The heads of completely developed spermatozoa are aligned horseshoe-shaped. Oocytes and spermatozoa adjoin each other directly. Heterandria formosa is the only known abnormal hermaphroditic species of fish in which spermatozoa and mature eggs occur simultaneously in the gonad.
通过光学显微镜和电子显微镜对100多只成年未产卵的食蚊鱼科美丽食蚊鱼雌性个体的卵巢进行了研究。在这些雌性个体中发现了两个雌雄同体的标本。雌雄同体个体的性腺在外观上与正常雌性个体的性腺并无差异。在半薄切片和超薄切片中，可以区分出性腺的雌性和雄性部分。雌性部分占主导地位。雌雄同体性腺中的卵母细胞处于卵黄生成阶段。它们被一层薄的放射冠所包裹。完全发育成熟的精子头部呈马蹄形排列。卵母细胞和精子直接相邻。美丽食蚊鱼是已知唯一一种性腺中同时存在精子和成熟卵子的异常雌雄同体鱼类。
