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Phthanoperidinium stockmansii
From Fensome et al., 2019:
Phthanoperidinium stockmansii (de Coninck, 1975, p.97–98, pl.17, figs.18–37) Lentin and Williams, 1977b, p.131. Holotype: de Coninck, 1975, pl.17, figs.26–27. Originally Peridinium (Appendix B), subsequently Phthanoperidinium. Taxonomic junior synonyms: Phthanoperidinium echinatum, according to de Coninck (1977, p.40) and by implication in Islam (1982, p.315), who considered Phthanoperidinium echinatum to be the senior name; Phthanoperidinium? pseudoechinatum, by implication in Islam (1982, p.309), who considered Phthanoperidinium? pseudoechinatum to be a taxonomic junior synonym of Phthanoperidinium echinatum. Stover and Evitt (1978, p.119) considered this species to be a possible taxonomic junior synonym of Phthanoperidinium eocenicum. Age: Ypresian.
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Original description (De Conick, 1975) Translation PKB 2025:
Holotype: Herelbeke - 11.5 m. Preparation 4; coord. 41.6 - 119.9. PI.XVII, fig.26-27.
Diagnosis: The organisms are ovoid. Their wall is more or less reticulated depending on the individual. They have a short apical horn and a variably developed antapical horn. The equatorial girdle is always clearly visible. On the body are series of rods with swollen distal ends, which follow the edges of the plates. Complete tabulation could not be determined. However, in several cases, I observed on the ventral side, between the interruption of the girdle and the apex, a lozenge-shaped plate (PI.XVII, fig.28-29), characteristic of the genus Peridinium. The dimensions of the horns and rods are relatively variable. The intercalary archaeopyle is in most cases impossible to localize. The most striking features are the general shape, and the very numerous small bacilliform processes on the body, at the edge of the plates. Body dimensions: about 28 to 35 µm by 27 to 32 µm. Rod length: up to 2 µm. Height of the apical horn: about 5 to 8 µm, exceptionally up to 15 µm. Total wingspan: about 32 to 42 µm by 3D at 36 µm. Stratigraphic occurrence: P. stockmansi occurs regularly only above the lower quarter of the Ypres Clay.
Phthanoperidinium stockmansii (de Coninck, 1975, p.97–98, pl.17, figs.18–37) Lentin and Williams, 1977b, p.131. Holotype: de Coninck, 1975, pl.17, figs.26–27. Originally Peridinium (Appendix B), subsequently Phthanoperidinium. Taxonomic junior synonyms: Phthanoperidinium echinatum, according to de Coninck (1977, p.40) and by implication in Islam (1982, p.315), who considered Phthanoperidinium echinatum to be the senior name; Phthanoperidinium? pseudoechinatum, by implication in Islam (1982, p.309), who considered Phthanoperidinium? pseudoechinatum to be a taxonomic junior synonym of Phthanoperidinium echinatum. Stover and Evitt (1978, p.119) considered this species to be a possible taxonomic junior synonym of Phthanoperidinium eocenicum. Age: Ypresian.
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Original description (De Conick, 1975) Translation PKB 2025:
Holotype: Herelbeke - 11.5 m. Preparation 4; coord. 41.6 - 119.9. PI.XVII, fig.26-27.
Diagnosis: The organisms are ovoid. Their wall is more or less reticulated depending on the individual. They have a short apical horn and a variably developed antapical horn. The equatorial girdle is always clearly visible. On the body are series of rods with swollen distal ends, which follow the edges of the plates. Complete tabulation could not be determined. However, in several cases, I observed on the ventral side, between the interruption of the girdle and the apex, a lozenge-shaped plate (PI.XVII, fig.28-29), characteristic of the genus Peridinium. The dimensions of the horns and rods are relatively variable. The intercalary archaeopyle is in most cases impossible to localize. The most striking features are the general shape, and the very numerous small bacilliform processes on the body, at the edge of the plates. Body dimensions: about 28 to 35 µm by 27 to 32 µm. Rod length: up to 2 µm. Height of the apical horn: about 5 to 8 µm, exceptionally up to 15 µm. Total wingspan: about 32 to 42 µm by 3D at 36 µm. Stratigraphic occurrence: P. stockmansi occurs regularly only above the lower quarter of the Ypres Clay.