[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
     Class Bacillariophyceae Haeckel (1878) - pennates
       Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms
         Order Naviculales Bessey (1907)
           Suborder Neidiineae D.G.Mann (1990)
             Family Pleurosigmataceae Mereschk. (1903)
               Genus Gyrosigma Hassall (1845)
                 Gyrosigma spenceri (J.W. Bailey ex Quekett) Griffith & Henfr.