From Fensome et al., 2019:
Tenua biornata ssp. biornata
Autonym. Holotype: Jiabo, 1978, pl.22, fig.24.
Originally Tenua biornata subsp. biornata, subsequently Kallosphaeridium biornatum subsp. biornatum (combination not validly published), thirdly Kallosphaeridium biparatum subsp. biparatum, fourthly Batiacasphaera biornata subsp. biornata, fifthly Sentusidinium biornatum subsp. biornatum.
Taxonomic senior synonym: Sentusidinium baculatum, according to Wood et al. (2016, p.83).

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