IRMNG Taxon list
Cavernosa kapitiana S.R. Stidolph, 1990
Orthoseira americana (Kützing) F.E. Round, R.M. Crawford & D.G. Mann
Orthoseira angulata Gregory, 1857 accepted as Thalassiosira angulata (W. Gregory) Hasle, 1978
Orthoseira asiatica (Skvortzov) Kobayasi
Orthoseira biportulata Van de Vijver & Beyens
Orthoseira circularis (Ehrenberg) R.M. Crawford, E.Y. Haworth & M.G. Kelly
Orthoseira crenulata (Ehrenberg) Studnicka
Orthoseira dendrophila (Ehrenberg) F.E. Round, R.M. Crawford & D.G. Mann, 1990
Orthoseira dendroteres (Ehrenberg) F.E. Round, R.M. Crawford & D.G. Mann, 1990
Orthoseira dickiei Thwaites, 1848 accepted as Melosira dickiei (Thwaites) Kützing, 1849
Orthoseira epidendron (Ehrenberg) F.E. Round, R.M. Crawford & D.G. Mann, 1990
Orthoseira gremmenii Van de Vijver & Kopalova, 2008
Orthoseira marina W. Smith, 1856 accepted as Paralia sulcata (Ehrenberg) Cleve, 1873
Orthoseira punctata W. Smith, 1856
Orthoseira roeseana (Rabenhorst) O'Meara, 1875
Orthoseira roeseana (Rabenhorst) O'Meara, 1876 accepted as Melosira roeseana Rabenhorst, 1852
Orthoseira roseana (Rabenhorst) O'Meara, 1876
Orthoseira rotula (Kützing) Heiberg
Orthosira arenaria (Moore) W. Smith, 1856 accepted as Ellerbeckia arenaria (Moore ex Ralfs) R.M. Crawford, 1988 accepted as Melosira arenaria Moore ex Ralfs, 1843
Orthosira granulata (Ehrenberg) Schonfeldt, 1907 accepted as Aulacoseira granulata (Ehrenberg) Simonsen, 1979 accepted as Melosira granulata (Ehrenberg) Ralfs, 1861
Orthosira kuetzingiana (Thwaites) Heiberg, 1863 accepted as Cyclotella kuetzingiana Thwaites, 1848 accepted as Cyclotella ocellata Pantocsek, 1901