Kallosphaeridium biparatum subsp. crassum

"subsp. crassum" (Jiabo, 1978, p.52, pl.23, figs.1–4) Lentin and Williams, 1981, p.160.  Holotype: Jiabo, 1978, pl.23, fig.3.  NOW Sentusidinium biornatum subsp. crassum.  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.  Age: Early Tertiary.

Parent: Kallosphaeridium biparatum