Gonyaulax confusum Vozzhennikova, 1967

Now Apteodinium. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly Millioudodinium?, fourthly Rhynchodiniopsis?, fifthly (and now) Apteodinium.

Holotype: Vozzhennikova, 1967, pl.25, fig.5 (lost according to Lentin and Vozzhennikova, 1990
Lectotype: none available, according to Lentin and Vozzhennikova, 1990
Locus typicus: Mocow region, Russia
Stratum typicum: Late Jurassic
Translation Vozzhennikova, Lentin and Vozzhennikova, 1990

Original description: Vozzhennikova, 1967, p.80
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 witdh of the furrow. The edges of the furrow and of the plates delinited by very low processes, which tend to obscure the outlines particularly of the plates on the ventral side of the epitheca. Thecal armour thick, its surface granular or finely tuberculate; thickness of walls 2 to 2.5 Ám. Pylome present.
Size: Holotype, length 93 Ám, width 62 Ám, width of paracingulum about 3 Ám; Range, length 78-100 Ám, width 62-95 Ám.