Inversidinium minusculum

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"+minusculum" (Alberti, 1961, p.10-11, pl.1, fig.10; pl.12, fig.4) Costa and Downie, 1979, p.44.  Holotype: Alberti, 1961, pl.1, fig.10.  NOW Palaeotetradinium.  Originally Wetzeliella subgenus Rhombodinium, subsequently Rhombodinium?, thirdly Inversidinium, fourthly (and now) Palaeotetradinium.  Taxonomic junior synonym: Inversidinium exilimurum, according to Stover and Evitt (1978, p.71).  The nomenclatural type of the genus Inversidinium remains the holotype of Inversidinium exilimurum.  Age: Early Eocene.

Parent: Inversidinium