pachyphloiidae pachyphloiidae pachyphloiidae is a family of uniserial permian foraminifera included in the fusulinid superfamily geinitzinacea along with the geinitzinidae. three genera are recognized. they are: pachyphloia, type robustopachyphloia, maichelina pachyphloiidaetemporal range: permian scientific classification domain: eukaryota (unranked): sar (unranked): rhizaria phylum: retaria class: foraminifera order: fusulinida superfamily: geinitzinacea family: pachyphloiidaeloeblich and tappan, 1984 genera see text pachyphloiid genera are characterized by their free, compressed, uniserial tests with broad low chambers recurved laterally and microgranular calcareous walls with secondary lamellar thickening on both sides which distinguishes them from the ancestral geinitzinidae.