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Phthanoperidinium schizokeras
From Fensome et al., 2019:
Phthanoperidinium ?schizokeras (de Coninck, 1975, p.97, pl.17, figs.16–17) Lentin and Williams, 1977b, p.131. Holotype: de Coninck, 1975, pl.17, figs.16–17. Originally Peridinium (Appendix B), subsequently Phthanoperidinium, thirdly (and now) Phthanoperidinium?. Questionable assignment: Stover and Evitt (1978, p.119). Age: Ypresian.
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Original description (De Coninck, 1975) Not yet translated from French
Holotype: Kallo - 329.5 m. Preparation 2; coord. 41.2 - 118.7.
Diagnosis: An ovoid body bears low, weakly serrated ridges. I observed 7 precingulate plates. The equatorial girdle is weakly helidoidal and interrupted by a wide ventral fossa that extends between the apex and the antapex. The intercalary archaeopyle is weakly indicated by fracture lines that contour the 3 intercalary plates. On the apex is a short horn that divides in two from the base (schizokeras: Greek, schizein = to divide, keras = horn). On the antapex, the ridges become higher, but it is not possible to recognize horns. Body dimensions: approximately 40 by 32 µm. Apical horn height: approximately 4 µm.
Total wingspan: approximately 47 µm by 37 µm.
Phthanoperidinium ?schizokeras (de Coninck, 1975, p.97, pl.17, figs.16–17) Lentin and Williams, 1977b, p.131. Holotype: de Coninck, 1975, pl.17, figs.16–17. Originally Peridinium (Appendix B), subsequently Phthanoperidinium, thirdly (and now) Phthanoperidinium?. Questionable assignment: Stover and Evitt (1978, p.119). Age: Ypresian.
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Original description (De Coninck, 1975) Not yet translated from French
Holotype: Kallo - 329.5 m. Preparation 2; coord. 41.2 - 118.7.
Diagnosis: An ovoid body bears low, weakly serrated ridges. I observed 7 precingulate plates. The equatorial girdle is weakly helidoidal and interrupted by a wide ventral fossa that extends between the apex and the antapex. The intercalary archaeopyle is weakly indicated by fracture lines that contour the 3 intercalary plates. On the apex is a short horn that divides in two from the base (schizokeras: Greek, schizein = to divide, keras = horn). On the antapex, the ridges become higher, but it is not possible to recognize horns. Body dimensions: approximately 40 by 32 µm. Apical horn height: approximately 4 µm.
Total wingspan: approximately 47 µm by 37 µm.