- Orthoseira angulata Gregory, 1857 accepted as Thalassiosira angulata (W.Gregory) Hasle, 1978 accepted as Orthosira angulata Gregory, 1857
- Orthoseira marina W.Smith, 1856 accepted as Paralia sulcata (Ehrenberg) Cleve, 1873
- Orthoseira roeseana (Rabenhorst) O'Meara, 1876 accepted as Orthosira roeseana (Rabenhorst) Pfitzer, 1871
- Orthoseira roseana (Rabenhorst) O'Meara, 1875 accepted as Orthoseira roeseana (Rabenhorst) O'Meara, 1876 accepted as Orthosira roeseana (Rabenhorst) Pfitzer, 1871