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Apteodinium confusum
From Fensome et al., 2019:
Apteodinium confusum (Vozzhennikova, 1967, p.80, pl.17, figs.1a–b; pl.25, figs.4–5; pl.27, figs.3–4) Helenes, 1984, p.132. Holotype: Vozzhennikova, 1967, pl.25, fig.5, lost according to Lentin and Vozzhennikova (1990, p.93). Originally
Gonyaulax (Appendix B), subsequently Gonyaulacysta, thirdly Millioudodinium?, fourthly Rhynchodiniopsis?,
fifthly (and now) Apteodinium. Lentin and Vozzhennikova (1990, p.93–94) retained this species in Apteodinium.
According to Lentin and Vozzhennikova (1990, p.93), no potential lectotype is available. Lentin and Williams
(1989, p.20) recommended that this name be restricted to the holotype. Age: Late Jurassic.
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Original description as Gonyaulax confusum: [Vozzhennikova, 1967, p. 80]: (Translation: Lentin and Vozzhennikova, 1990)
Description:
Theca with somewhat asymmetrical rhomboidal outline Epitheca equal in size to the hypotheca or somewhat larger, with a small, bluntly tipped apical horn, thickened at the base and somewhat laterally compressed. Hypotheca trapeziform, its smaller side corresponding to the antapical part of the theca. Antapical plate quadrangular Transverse furrow shallow, twisted to the left, the two ends distant from each other by the width of the furrow. The edges of the furrow and of the plates delimited by very low processes, which tend to obscure the outlines particularly of the plates on the ventral side of the epitheca. Thecal armor thick, its surface granular or finely tuberculate; thickness of walls 2 to 2.5 µm. Pylome present.
Dimensions:
Size: Holotype, length 93 µm, width 62 µm, width of paracingulum about 3 µm; Range, length 78 - 100 µm, width 62 - 95 µm.
Apteodinium confusum (Vozzhennikova, 1967, p.80, pl.17, figs.1a–b; pl.25, figs.4–5; pl.27, figs.3–4) Helenes, 1984, p.132. Holotype: Vozzhennikova, 1967, pl.25, fig.5, lost according to Lentin and Vozzhennikova (1990, p.93). Originally
Gonyaulax (Appendix B), subsequently Gonyaulacysta, thirdly Millioudodinium?, fourthly Rhynchodiniopsis?,
fifthly (and now) Apteodinium. Lentin and Vozzhennikova (1990, p.93–94) retained this species in Apteodinium.
According to Lentin and Vozzhennikova (1990, p.93), no potential lectotype is available. Lentin and Williams
(1989, p.20) recommended that this name be restricted to the holotype. Age: Late Jurassic.
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Original description as Gonyaulax confusum: [Vozzhennikova, 1967, p. 80]: (Translation: Lentin and Vozzhennikova, 1990)
Description:
Theca with somewhat asymmetrical rhomboidal outline Epitheca equal in size to the hypotheca or somewhat larger, with a small, bluntly tipped apical horn, thickened at the base and somewhat laterally compressed. Hypotheca trapeziform, its smaller side corresponding to the antapical part of the theca. Antapical plate quadrangular Transverse furrow shallow, twisted to the left, the two ends distant from each other by the width of the furrow. The edges of the furrow and of the plates delimited by very low processes, which tend to obscure the outlines particularly of the plates on the ventral side of the epitheca. Thecal armor thick, its surface granular or finely tuberculate; thickness of walls 2 to 2.5 µm. Pylome present.
Dimensions:
Size: Holotype, length 93 µm, width 62 µm, width of paracingulum about 3 µm; Range, length 78 - 100 µm, width 62 - 95 µm.