1876
Monograptus cyphus, sp. nov. — Lapworth, pp. 352, fig. 12:3a, c
1910
Monograptus cyphus — Elles et Wood, pp. 362, fig. 36:1a-e
1952
Pristiograptus cyphus — Münch, pp. 83, fig. 17:1
1965
Pristiograptus cyphus — Obut et Sobolevskaya, pp. 66, fig. 11:1-2
1970
Monograptus cyphus — Hutt et Rickards, pp. 62, fig. 4:11
1976
Coronograptus cyphus (Lapworth, 1876) — Sennikov, pp. 183-184, fig. 11:3-4
1985
Coronograptus cyphus (Lapworth, 1876) — Obut & Sennikov, pp. 57
2014
Coronograptus cyphus (Lapworth, 1876) — Maletz et al., pp. 178