Classification of the subgenus Grammatodon (Cosmetodon)
G. †Cosmetodon Branson 1942
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†Grammatodon (Cosmetodon) keyserlingii d'Orbigny 1850
†Grammatodon (Cosmetodon) marshallensis Winchell 1862
†Grammatodon (Cosmetodon) mediodepressum Krumbeck 1913
†Grammatodon (Cosmetodon) obsoletiformis Hayasaka 1925
†Grammatodon (Cosmetodon) politus Girty 1908
†Grammatodon (Cosmetodon) sulcatinus Evans and Shumard 1857
†Grammatodon (Cosmetodon) suzukii Nakazawa 1999