Sentusidinium biornatum subsp. crassum

subsp. crassum (Jiabo, 1978, p.52, pl.23, figs.1–4) He Chengquan et al., 2009, p. 250.  Holotype: Jiabo, 1978, pl.23, fig.3.  Originally Tenua biornata subsp. crassa, subsequently Kallosphaeridium biornatum subsp. crassum (combination not validly published), thirdly Kallosphaeridium biparatum subsp. crassum, fourthly Batiacasphaera biornata subsp. crassa, fifthy (and now) Sentusidinium biornatum subsp. crassum.  He Chengquan et al. (2009, p.250) implied that this combination was proposed by He Chengquan et al. (1989, p.67), but we have been unable to verify this.  Age: Early Tertiary.

Parent: Sentusidinium biornatum