primary gonial cell primary spermatogonial cell fly_anatomy.ontology gonialblast CL:0000020 FBbt:00004934 Note - there is some confusion in the use of this term in the historical literature. The male germline stem cell is sometimes referred to as the 'primary spermatogonia'. Daughter of a male germline stem cell. Unlike its sister, which will remain a stem cell, the primary gonial cell is displaced laterally from the hub cells, where it becomes enclosed by two 'cyst cells'. Morphology is much like its stem cell sister. spermatogonium