Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Reptilia Linnaeus, 1758 - reptiles
               Subclass Anapsida Osborn, 1903 - anapsids
                 Order Testudines Wagler, 1830 - turtles
                   Suborder Cryptodira Cope, 1868
                     Family Trionychidae Gray, 1825 - softshell turtles
                       Subfamily Trionychinae Gray, 1825
                         Genus Trionyx Geoffroy Saint-Hilaire, 1809
                           01 Trionyx sinensis Wiegmann, 1835 see Pelodiscus sinensis (Wiegmann, 1835)
                           02 Trionyx triunguis (Forskål, 1775) - African softshell turtle
                           03 Trionyx gangeticus Cuvier, 1825 - Indian softshell turtle see Aspideretes gangeticus (Cuvier, 1825)
                           04 Trionyx hurum Gray, 1831 - peacock softshell turtle see Aspideretes hurum (Gray, 1831b)
                           05 Trionyx formosus Gray, 1869 see Nilssonia formosa (Gray, 1869)
                           06 Trionyx euphraticus (Daudin, 1802) see Rafetus euphraticus (Daudin, 1801)
                           07 Trionyx cartilagineus (Boddaert, 1770) see Amyda cartilaginea (Boddaert, 1770)
                           08 Trionyx ferox (Schneider, 1783) see Apalone ferox (Schneider, 1783)
                           09 Trionyx spiniferus Le Sueur, 1827 - spiny softshell turtle see Apalone spinifera spinifera (LeSueur, 1827)
                           10 Trionyx muticus Le Sueur, 1827 see Apalone mutica (LeSueur, 1827)
                           11 Trionyx ater Webb & Legler, 1960 - Cuatro Cienegas softshell turtle see Apalone spinifera ater (Webb & Legler, 1960)