Achnanthidium deflexum (C.W.Reimer) J.C.Kingston, 2000 accepted as
Achnanthes deflexa C.W.Reimer, 1966 (new combination reference)
Kolbesia amoena (Hustedt) J.C.Kingston, 2000 (new combination reference)
Kolbesia ploenensis (Hustedt) Round & L.Bukhtiyarova ex Round, 1998 accepted as
Achnanthes ploenensis Hustedt, 1930 represented as
Karayevia ploenensis (Hustedt) Bukhtiyarova, 1999 (new combination reference)
Kolbesia suchlandtii (Hustedt) J.C.Kingston, 2000 (new combination reference)
Oxyneis binalis var. elliptica (R. J. Flower) J.C. Kingston, 2000 (new combination reference)
Pseudostaurosira brevistriata var. elliptica (Héribaud-Joseph) J.C.Kingston, 2000 (new combination reference)
Rossithidium duthiei (M.R. Sreenivasa) J.C. Kingston, 2000 † (new combination reference)
Staurosira construens var. pumila (Grunow) J.C.Kingston, 2000 (new combination reference)
Staurosirella ansata (M.H. Hohn & J. Hellerman) J.C. Kingston, 2000 (new combination reference)
Staurosirella spinosa (Skvortzow) J.C. Kingston, 2000 (new combination reference)