Observations on a monocystid gregarine, Apolocystis elongata n.sp., in the seminal vesicles of Eisenia foetida (Sav.)

Abstract

1. A new monocystid gregarine is reported from the seminal vesicles of brandling worms, Eisenia foetida Sav. The morphology and movements of the trophozoite are described, and the stages of gametogony and sporogony are outlined.2. The chromosome cycle is investigated. The haploid number of chromosomes is four, and the reduction division is shown to be zygotic.3. The systematic position of the gregarine is discussed, and it is placed in the genus Apolocystis as A. elongata n.sp.