Frustulia rhomboides var. lancelolata
Frustulia rhomboides f. capitata
Frustulia rhomboides var. capitata
Frustulia rhomboides var. compacta
Frustulia rhomboides f. dispersata
Frustulia rhomboides var. elongatissima
Frustulia rhomboides var. lacustris
Frustulia rhomboides f. occidentalis
Frustulia rhomboides var. leptocephala
Frustulia rhomboides var. elongata
Frustulia rhomboides var. elliptica
Frustulia rhomboides var. undulata
Frustulia rhomboides f. undulata