From Fensome et al., 2019:

"Imperfectodinium", Zevenboom and Santarelli in Zevenboom, 1995, p.146.
Name not validly published: considered a manuscript name. This name was also not validly published in Gedl (1996, p.198), since no
description was provided.
Type: Zevenboom, 1995, pl.6, figs.1–4, as Imperfectodinium bulbosum.