Estonioceras imperfectum (Quenstedt, 1846)

1821     Lituites imperfectus — Wahlenberg, pp. 84

1845     Lituites imperfectus — Quenstedt, fig. 2:17

1849     Lituites imperfectus — Quenstedt, pp. 51, fig. 2:3a,b

1860     Estonioceras imperfectum — Lossen, pp. 20

1891     Estonioceras imperfectum — Schröder, pp. 37, fig. III 2; IV 3-4

1905     Estonioceras imperfectum — Lamansky, pp. 81

1953     Estonioceras imperfectum (Quenstedt, 1846) — Balashov, pp. 220-222, fig. 2:1-3

1959     Estonioceras imperfectum — Sweet, pp. 299

1964     Estonioceras imperfectum — Chang, pp. 132-133, 138, fig. 1:5

1971     Estonioceras imperfectum — Neben & Krüger, fig. 18:4

2005     Estonioceras imperfectum (Quenstedt, 1845) — Kröger & Mutvei, pp. 787, fig. text fig. 2D-F, 5E

2013     Estonioceras imperfectum — Mutvei, pp. 174, fig. 2