1891
Didymograptus gracilis — Törnquist, pp. 17, fig. 1:9-12
1895
Didymograptus gracilis — Törnquist, fig. 1:7-8
1895
Didymograptus gracilis — Elles, pp. 506
1901
Didymograptus gracilis — Elles et Wood, pp. 24, fig. 2:2
1902
Didymograptus gracilis — Ruedemann, pp. 589, fig. 17
1915
Didymograptus gracilis — Bassler, pp. 432
1937
Didymograptus gracilis — Monsen, pp. 123, fig. 2:70
1947
Didymograptus gracilis Törnquist — Ruedemann, pp. 334, fig. 57:1-6