1880
Cryptograptus tricornis var. schaeferi n. var. — Lapworth, fig. 5:28a,b
1913
Cryptograptus lanceolatus n. sp. — Hadding, pp. 40, fig. 2:10-12
1913
Cryptograptus tricornis (Carruthers) — Hadding, pp. 40, fig. 2:13-14
1937
Cryptograptus tricornis (Carruthers) — Ekström, pp. 39, fig. 9:1-5
1937
Cryptograptus tricornis var. longispinus nov. — Ekström, pp. 40, fig. 8:13
1937
Cryptograptus lanceolatus Hadding — Ekström, pp. 40, fig. 8:11-12
1967
Cryptograptus schaeferi Lapworth — Jaeger, fig. 1:9
1976
Cryptograptus tricornis var. schaeferi — Jaeger, fig. 1
1996
Cryptograptus schaeferi Lapworth — Maletz & Mitchell, pp. 646, fig. 2:3,4; 4:11-15; 5
1998
Cryptograptus schaeferi (Lapworth, 1880) — Maletz, pp. 362, fig. 7C