Dimidiadinium sphaerocephalum
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"sphaerocephalum" (Vozzhennikova, 1967, p.181, pl.103, figs.1a–b,2,3a–b; pl.104, figs.4,5a–b) Brideaux, 1977, p.38. Holotype: Vozzhennikova, 1967, pl.103, fig.2; Lentin and Vozzhennikova, 1990, text-fig.55; lost according to Lentin and Vozzhennikova (1990, p.98). Originally Tubotuberella, subsequently Dimidiadinium. Taxonomic senior synonym: Gonyaulax (as and now Gonyaulacysta) eisenackii, according to Sarjeant (1982b, p.32). Brenner (1988, p.93) considered Leptodinium (now Tubotuberella) egemenii and Gonyaulacysta (now Tubotuberella) vozzhennikovae, to be questionable taxonomic junior synonyms of this species. According to Lentin and Vozzhennikova (1990, p.98), no potential lectotype is available. Age: Late Jurassic.
Parent: Dimidiadinium