HKRMS Taxon list
Gyrosigma balticum (Ehrenberg) Rabenhorst, 1853
Gyrosigma balticum var. brevius Chin & Liu, 1979 (uncertain > unassessed )
Gyrosigma gibbosum Ricard, 1975 (uncertain > unassessed )
Gyrosigma sciotense (Sullivan & Wormley) Cleve, 1894 accepted as Pleurosigma sciotense Sullivant & Wormley, 1859
Pleurosigma acutum Norman ex Ralfs, 1861 (uncertain > unassessed )
Pleurosigma aestuarii (Brébisson ex Kützing) W.Smith, 1853
Pleurosigma affine Grunow, 1880 (uncertain > unassessed )
Pleurosigma affine var. fossilis Grunow in Cleve & Grunow, 1880 (uncertain > unassessed )
Pleurosigma angulatum (Queckett) W.Smith, 1852 (uncertain > unassessed )
Pleurosigma angulatum var. falcatum Liu & Chin, 1979 (uncertain > unassessed )
Pleurosigma elongatum W.Smith, 1852
Pleurosigma falx Mann, 1925 (uncertain > unassessed )
Pleurosigma formosum W.Smith, 1852
Pleurosigma intermedium W.Smith, 1853
Pleurosigma major Liu & Chin, 1980 (uncertain > unassessed )
Pleurosigma naviculaceum Brébisson, 1854
Pleurosigma normanii Ralfs, 1861
Pleurosigma normanii var. fossilis (Grunow in Cleve & Grunow) Cleve, 1894 accepted as Pleurosigma affine var. fossilis Grunow in Cleve & Grunow, 1880
Pleurosigma rigidum W.Smith, 1853
Pleurosigma sciotense Sullivant & Wormley, 1859 (uncertain > unassessed )
Pleurosigma tahitianum Ricard, 1975 (uncertain > unassessed )