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Apteodinium confusum
Apteodinium confusum, (Vozzhennikova, 1967), Helenes, 1984
Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium?, fourthly Rhynchodiniopsis?, fifthly (and now) Apteodinium. Lentin and Williams, 1985, 1989, questionably retained this species in Rhynchodiniopsis Deflandre, 1935; the latter authors recommended that the name be restricted to the holotype. Lentin and Vozzhennikova, 1990, retained the species in Apteodinium.
Holotype: Vozzhennikova, 1967, pl.25, fig.5 (lost according to Lentin and Vozzhennikova, 1990)
Lectotype: None available acording to Lentin and Vozzhennikova, 1990
Locus typicus: Mocow region, USSR
Stratum typicum: 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.
Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium?, fourthly Rhynchodiniopsis?, fifthly (and now) Apteodinium. Lentin and Williams, 1985, 1989, questionably retained this species in Rhynchodiniopsis Deflandre, 1935; the latter authors recommended that the name be restricted to the holotype. Lentin and Vozzhennikova, 1990, retained the species in Apteodinium.
Holotype: Vozzhennikova, 1967, pl.25, fig.5 (lost according to Lentin and Vozzhennikova, 1990)
Lectotype: None available acording to Lentin and Vozzhennikova, 1990
Locus typicus: Mocow region, USSR
Stratum typicum: 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.