Rhombodinium pentagonum

?pentagonum Vozzhennikova, 1967, p.171–172, pl.89, fig.4; pl.95, figs.1–5; pl.96, figs.1–6.  Holotype: Vozzhennikova, 1967, pl.96, fig.3, lost according to Lentin and Vozzhennikova (1990, p.78).  Lectotype: Lentin and Vozzhennikova, 1990, pl.7, fig.4; text-fig.42, designated by Lentin and Vozzhennikova (1990, p.78).  Originally Rhombodinium, subsequently Wetzeliella, thirdly (and now) Rhombodinium?.  Stover and Evitt (1978, p.121) retained this species in Rhombodinium.  Questionable assignment: Lentin and Vozzhennikova (1990, p.79).  Taxonomic senior synonym: Wetzeliella articulata, according to Costa and Downie (1979, p.40) — however, Lentin and Williams (1981, p.244) retained Rhombodinium pentagonum.  Lentin and Vozzhennikova (1990, p.79) provided an "expanded description" for this species.  Age: late Eocene–early Oligocene.

Parent: Rhombodinium