1858
Phragmoceras sphynx — Schmidt, pp. 200
1930
Protophragmoceras sphinx — Teichert, pp. 270, 299-301, fig. 7:20; 8:24; text fig. 3,4
1934
Protophragmoceras sphynx — Strand, pp. 93
1957
Strandoceras sphynx — Flower in Flower & Teichert, pp. 57, 114, fig. text fig. 15c,g-h
1975
Strandoceras sphinx — Balashov, pp. 69, fig. 2:1
1984
Protophragmoceras sphinx — Dzik, pp. 48, 52, 65, fig. 7:7; text fig. 14.5
2013
Strandoceras sphinx (Schmidt, 1858) — Kröger, pp. 16, fig. 7E