1862
Graptolithus hamatus — Baily, pp. 305, fig. 4:6a-b
1914
Cyrtograptus hamatus (Baily) — Elles et Wood, pp. 510-511, fig. 52:3
1936
Cyrtograptus hamatus (Baily) — Bouček, pp. 46-47, fig. 5:9-11
1954
Cyrtograptus hamatus (Baily) — Cope, pp. 319-322, fig. 1a,e
1975
Cyrtograptus hamatus (Baily) — Berry et Murphy, pp. 82-83, fig. 11:1-2
1999
Cyrtograptus cf. hamatus (Baily, 1862) sic — Zalasiewicz et Williams, fig. 10 i-j
2004
Cyrtograptus cf. hamatus (Baily, 1861) — Williams et Zalasiewicz, pp. 239, fig. 7D-E
2008
Cyrtograptus hamatus (Bailly, 1861) — Lenz & Melchin, pp. 454