Cylindroid, solitary, with mucron, late syzygy and coelomic
habitat of the parasite in an earthworm justify the inclusion of
the present form under the family Monocystidae, subfamily
Monocystinae and genus Monocystis Stein, 1848. Of more
than 70 species belonging to the genus Monocystis Stein,
1848, only 13 have been described from India. The present
monocystid gregarine obtained from the seminal vesicles of
the earthworm Amynthas hawayanus has been compared with
other species of the genus Monocystis and found that it
resembles only two Indian species, Monocystis clubae
Bandyopadhyay et al. 2006a and M. metaphirae
Bandyopadhyay et al. 2006b. The species under discussion
resembles M. clubae in having anterior broad posterior narrow
end only.