Order Testudines Wagler, 1830 - turtles
   Suborder Cryptodira Cope, 1868
     Superfamily Trionychoidea Gray, 1825
       Family Trionychidae Gray, 1825 - softshell turtles
         1 Subfamily Cyclanorbinae Lydekker, 1889
         2 Subfamily Trionychinae Gray, 1825