Rhombodinium minusculum

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"?minusculum" (Alberti, 1961, p.10-11, pl.1, fig.10; pl.12, fig.4) Lentin and Williams, 1973, p.120.  Holotype: Alberti, 1961, pl.1, fig.10.  NOW Palaeotetradinium.  Originally Wetzeliella subgenus Rhombodinium, subsequently Rhombodinium?, thirdly Inversidinium, fourthly (and now) Palaeotetradinium.  Questionable assignment: Lentin and Williams (1976, p.128).  Taxonomic junior synonym: Inversidinium exilimurum, according to Stover and Evitt (1978, p.71).  Age: Early Eocene.

Parent: Rhombodinium