The development of gametes and somatic cells in the ovotestis of Laevicaulis alte of different body weights is studied using transmission electron microscopy. Spermatogenesis is a proliferative phase in the ovotestis of smaller slugs acting as males, while oogenesis predominantly occurs in larger slugs acting as females. Male gametes are distributed throughout the acini in smaller slugs and residual cytoplasmic materials of developing spermatids bud off into the Sertoli cells. In larger slugs, each acinus comprises only one vitellogenic oocyte, completely surrounded by a follicle cell layer with a follicular cleft which is linked to the development of the oocyte. Oocytes utilise auto- and heterosynthetic mechanisms of yolk formation. Autosynthesis is accomplished by various ooplasmic organelles while heterosynthesis is promoted by an endocytic activity of the oolemma. The development of gonadal somatic cells is directly related to the growth of stage-specific gametogenesis. Sertoli cells are divided for the first time into two categories, cortical Sertoli cells or luminal Sertoli cells. Sertoli cells possess numerous tunnelling nanotubes which assist the transportation of cellular components to distant developing gametes. The suggestion that oocyte numbers in each acinus depend more on the corresponding habitats of the pulmonate species than on their taxonomic relatedness is discussed.

配子和体细胞中的卵睾发展Laevicaulis阿尔特使用透射电子显微镜研究了不同体重的人。精子发生是较小的雄性卵塞在卵睾丸中的增生期，而卵子形成主要发生在较大的雌性卵塞中。雄配子分布在整个腺泡中较小的中，并且发育中的精子的残留细胞质物质萌芽进入Sertoli细胞。在较大的中，每个腺泡仅包含一个卵黄形成的卵母细胞，被卵泡细胞层完全包围，卵泡裂与卵母细胞的发育有关。卵母细胞利用卵黄形成的自体和异源机制。自体合成是通过各种卵泡细胞器完成的，而异源合成是由油菜的内吞活性促进的。性腺体细胞的发育与阶段特异性配子发生的生长直接相关。Sertoli细胞首次被分为两类，皮质Sertoli细胞或管腔Sertoli细胞。睾丸支持细胞具有大量的隧穿纳米管，这些纳米管有助于将细胞成分转运至遥远的发育中的配子。讨论了每个腺泡中卵母细胞数量更多地取决于肺脏物种的相应生境而不是其分类学相关性的建议。