| Psammodictyon panduriforme var. continua Grunow |
| Psammodictyon panduriforme var. delicatulum (Grunow) M. Poulin, 1991 |
| Psammodictyon panduriforme var. minor (W. Greg.) E.Y. Haworth & M.G. Kelly |
| Pseudo-nitzschia H. Perag., 1899 |
| Pseudo-nitzschia americana (Hasle) G.A. Fryxell, 1993 |
| Pseudo-nitzschia australis Freng., 1939 |
| Pseudo-nitzschia brasiliana Lundholm, G.R. Hasle & G.A. Fryxell, 2002 |
| Pseudo-nitzschia caciantha Lundholm, Møstrup & Hasle, 2003 |
| Pseudo-nitzschia calliantha Lundholm, Moestrup & Hasle, 2003 |
| Pseudo-nitzschia cuspidata (Hasle) Hasle, 1974 |
| Pseudo-nitzschia decipiens Lundholm & Møstrup, 2006 |
| Pseudo-nitzschia delicatissima (Cleve) Heiden, 1928 |
| Pseudo-nitzschia fraudulenta (Cleve) Hasle, 1993 |
| Pseudo-nitzschia galaxiae Lundholm & Møstrup, 2002 |
| Pseudo-nitzschia granii (Hasle) Hasle, 1993 |
| Pseudo-nitzschia hustedtii Meister, 1937 |
| Pseudo-nitzschia inflatula (Hasle) Hasle, 1993 |
| Pseudo-nitzschia lineola (Cleve) Hasle, 1993 |
| Pseudo-nitzschia multiseries (Hasle) Hasle, 1995 |
| Pseudo-nitzschia multistriata (Takano) Takano, 1995 |