Efremova S M, Papkovskaia M V
Arkh Anat Gistol Embriol. 1980 Dec;79(12):88-95.
In the sponge Lubomirskia baicalensis, a representative of the endemic fauna in the Baikal Lake, male specimens were first discovered and successive stages of their spermatogenesis were followed at light and electron microscopic levels. Male sex cells develop in cysts surrounded with a membrane consisting of cells which resemble pinacocytes by their ultrastructure. One sponge, during the period a spermatogenesis, contains in its tissue testicular follicles at various stages of the male sex cells maturation, within every follicle the development occurring more or less synchronously. As a result of transformations taking place in the ultrastructural organization of the spermatid, a primitive type of spermatozoon is forming, without acrosome, with large amount of cytoplasm containing small mitochondria in it.
在贝加尔湖特有动物群的代表——贝加尔湖针海绵中，首次发现了雄性标本，并在光学和电子显微镜水平上追踪了其精子发生的连续阶段。雄性生殖细胞在被一层膜包围的囊中发育，这层膜由超微结构类似于扁平细胞的细胞组成。在精子发生期间，一个海绵组织中含有处于雄性生殖细胞成熟不同阶段的睾丸滤泡，每个滤泡内的发育或多或少是同步进行的。由于精子细胞超微结构组织发生的转变，一种原始类型的精子正在形成，没有顶体，含有大量细胞质，其中有小线粒体。
