Opaeopsomus wapellensis "subsp. minutus" Mao Shaozhi, 1989, p.141, pl.29, figs.12–15,17–25,30–31. Holotype: Mao Shaozhi, 1989, pl.29, fig.15. NOW Operculodinium centrocarpum subsp. minutum. Originally (and now) Operculodinium centrocarpum subsp. minutum, subsequently Opaeopsomus wapellensis subsp. minutus. Lentin and Williams (1993, p.465) inadvertently cited this taxon as Opaeopsomus wapellensis subsp. minutus. Age: Quaternary.