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Meiourogonyaulax superornata
From Fensome et al., 2019:
Meiourogonyaulax superornata (Wetzel, 1967a, p.869–870, pl.16, figs.8a–b) Sarjeant, 1969, p.15. Emendation: Sarjeant, 1980b, p.124–125, as Meiourogonyaulax superornata. Holotype: Wetzel, 1967a, pl.16, figs.8a–b; Sarjeant, 1980b, pl.1, figs.2–3; text-fig.4; Dietz et al., 1999, text-fig.5c. Originally Gonyaulax (Appendix B), subsequently (and now) Meiourogonyaulax, thirdly Gonyaulacysta?, fourthly Lithodinia, fifthly Lithodinia?. This species is retained in Meiourogonyaulax following the retention of the genus by Riding and Helby (2001d, p.81,83). Age: late Bathonian.
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Original description: Wetzel, 1967, p. 869-870
Diagnosis: A species of the genus Gonyaulax with very low epitheca (apex unknown because of shed apical calotte), with 6 trapezoidal pre-equatorial plates, an indented, laevorotatory girdle furrow and a weakly indicated longitudinal furrow with drop-shaped broadening on the hypotheca. The deeply chalice-shaped hypotheca has 6 post-equatorial plates, of which 1""" is very small, and 1 further intercalary and 1 antapical plate. The setting of the plate boundaries with high flanges seems specialised in that the flanges possess fence-like enforcements.
Dimensions: longitudinal diameter 70 µm. Holotype plus 5 incomplete specimens found.
Meiourogonyaulax superornata (Wetzel, 1967a, p.869–870, pl.16, figs.8a–b) Sarjeant, 1969, p.15. Emendation: Sarjeant, 1980b, p.124–125, as Meiourogonyaulax superornata. Holotype: Wetzel, 1967a, pl.16, figs.8a–b; Sarjeant, 1980b, pl.1, figs.2–3; text-fig.4; Dietz et al., 1999, text-fig.5c. Originally Gonyaulax (Appendix B), subsequently (and now) Meiourogonyaulax, thirdly Gonyaulacysta?, fourthly Lithodinia, fifthly Lithodinia?. This species is retained in Meiourogonyaulax following the retention of the genus by Riding and Helby (2001d, p.81,83). Age: late Bathonian.
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Original description: Wetzel, 1967, p. 869-870
Diagnosis: A species of the genus Gonyaulax with very low epitheca (apex unknown because of shed apical calotte), with 6 trapezoidal pre-equatorial plates, an indented, laevorotatory girdle furrow and a weakly indicated longitudinal furrow with drop-shaped broadening on the hypotheca. The deeply chalice-shaped hypotheca has 6 post-equatorial plates, of which 1""" is very small, and 1 further intercalary and 1 antapical plate. The setting of the plate boundaries with high flanges seems specialised in that the flanges possess fence-like enforcements.
Dimensions: longitudinal diameter 70 µm. Holotype plus 5 incomplete specimens found.