On the presence and character of the nucleolus in the spermatid and fecundant spermatozoons of heteropachyloidellus robustus roew

Summary The presence of the nucleolus and the nucleolonema in the spermatozoons of a specie of arachnides (Heteropachyloidellus robustus Roew.) is shown in this paper. This fact confirms the thesis supported in a previous work that the nucleolonema is a permanent cell structure.During the maturative process of the spermatid the nucleolus does not disappear, and only its morphology changes. After proving that the intranuclear body found in the spermatozoon is really the nucleolus, and after showing that this body is present in the fecundative spermatozoons removed from the female spermathecae, it is concluded that the nucleolus is carried to the egg together with the chromosomic material.