Alberti G, Fernandez N A, Coineau Y
Zoologisches Institut und Museum, Ernst-Moritz-Arndt-Universität, Greifswald, Johann-Sebastian-Bach-Strasse 11/12, D-17489 Greifswald, Germany.
Arthropod Struct Dev. 2007 Jun;36(2):221-31. doi: 10.1016/j.asd.2006.11.002. Epub 2007 Jan 30.
Ultrastructural details of spermiogenesis, spermatozoa and the spermatophore of the early derived actinedid mite Saxidromus delamarei are described. Spermatids and mature sperm cells are provided with up to four acrosomal complexes and nuclei derivatives (chromatin bodies). Due to this reason, the sperm cells may be classified as synspermia, a sperm type found only in some spiders until now. The acrosomal complex is composed of a remarkably complicated vacuole and filament. Other peculiarities of sperm structure correspond to those found in prostigmatic mites, i.e. penetration of the chromatin body by the acrosomal filament and the presence of peripheral invaginations of the plasmalemma. The sperm cells are covered by a thin secretion layer of probably proteinaceous material. Stalked spermatophores are rather large, but simply structured and contain relatively few sperm cells. The results are discussed taking systematical and behavioural aspects into account. In particular, it is suggested that the peculiar mating behaviour of these mites secures both sperm transfer and first male's sperm priority and that this allowed reduction of sperm numbers.
描述了早期分化的阿克蒂尼螨类萨克西德罗螨精子发生、精子和精荚的超微结构细节。精细胞和成熟精子细胞最多具有四个顶体复合体和细胞核衍生物（染色质体）。因此，精子细胞可归类为合精子，这是一种迄今为止仅在某些蜘蛛中发现的精子类型。顶体复合体由一个非常复杂的液泡和细丝组成。精子结构的其他特点与前气门螨类中发现的特点一致，即顶体细丝穿透染色质体以及质膜存在周边内陷。精子细胞被一层可能是蛋白质物质的薄分泌层覆盖。带柄精荚相当大，但结构简单，包含的精子细胞相对较少。从系统学和行为学方面对结果进行了讨论。特别是，有人提出这些螨类独特的交配行为确保了精子传递和第一只雄性精子的优先权，并且这使得精子数量得以减少。
