gruberellidae gruberellidae gruberellidae is a family of heterolobosea, its nucleolus fragments during mitosis, can be uni or multinucleated, has flagellated forms in genera stachyamoeba. gruberella, stachyamoeba. gruberellidae scientific classification domain: eukaryota (unranked): excavata phylum: percolozoa class: heterolobosea order: schizopyrenida family: gruberellidaepage & blanton 1985 genera gruberella oramoeba stachyamoeba vrihiamoeba