Frustulia acuminata Kütz., 1833 | Gyrosigma kuetzingii (Grunow) Cleve, 1894 | Gyrosigma kutzingii (Grunow) Cleve, 1894 | Gyrosigma spenceri (W. Sm.) Cleve | Gyrosigma spenceri (W.Smith) Griffith & Henfrey, 1856 | Gyrosigma spencerii (J.W.Bailey ex Quekett) Griffith & Henfrey, 1856 | Navicula acuminata (Kütz.) Kütz., 1844 | Navicula spencerii J.W.Bailey ex Quekett, 1848 | Pleurosigma acuminatum (Kütz.) W. Smith, 1852 | Pleurosigma acuminatum (Kütz.) Grunow, 1860 | Pleurosigma gracilentum Rabenh., 1861 | Pleurosigma kuetzingii Grunow, 1860 | Pleurosigma spencerii (Bailey ex Quekett) W.Smith, 1852 | Pleurosigma spenceri var. kuetzingii (Grunow) Grunow, 1880 | Scalptrum spenceri (Quekett) Kuntze, 1891 | Sigmatella acuminata (Kütz.) Bréb. & Godey, 1835