Ultrastructure of the male genital tract, spermatogenesis and spermatozoa of Hattena cometis Domrow (Acari: Gamasida: Ameroseiidae).

摘要: The ameroseiid mite Hattena cometis has a male genital system that consists of an unpaired, u-shaped testis and paired deferent ducts leading into unpaired accessory gland ejaculatory duct. opening is located anteriorly immedi- ately in front the sternal shield. Spermatogenesis simple, probably due to haploid nature male. Eight stages spermatogenesis could be roughly dis- tinguished. Mature spermatozoa as found defer- ent duct lumen are peculiar having bisected nucleus numerous peripheral flat chambers, which were formed from indentations plasmalemma. In inseminated females, observed syncytial tissue sperm access somatic cells ovary. These have achieved new structure, i.e., electron-dense plate dividing cell two unequal halves. dense intricate substructure. Its function unknown. considered repre- sent capacitated spermatozoa. chambers reduced number inside female. Similar cells, containing plate, seen vacuoles within epithelium one evidently under destruction, but before being completely dissolved had undergone development beyond mature Apparently, entering or syncy- tium triggers production (or capacitation process). Our observations com- pared with results obtained other anactinotrichid Acari, mainly Gamasida, confirm complete interpretation correlated evolution components gamasid reproductive systems. J. Morphol. 274:1010-