From Fensome et al., 2019:
Cyclonephelium distinctum ssp. psilatum (Yu Jingxian and Zhang Wangping, 1980, p.115, pl.6, figs.1–2) Lentin and Williams, 1985, p.86. Holotype: Yu Jingxian and Zhang Wangping, 1980, pl.6, fig.2. Originally Cyclonephelium distinctum var. psilatum, subsequently Cyclonephelium distinctum subsp. psilatum, thirdly Circulodinium distinctum subsp. psilatum. Taxonomic senior synonym (at species rank): Tenua kukebaiensis, according to Fensome et al. (2019a, p.48–49). Age: Turonian–Santonian.

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