Cleistosphaeridium spinosum, (Boltenhagen, 1977, p.54-55, pl.7, figs.1a-b,2,3a-b,4a-b,5a-b), Lentin and Williams, 1981, p.51; Emendation: Masure in Fauconnier and Masure, 2004, p.116-117, as Trichodinium boltenhagenii.

NOW Trichodinium boltenhagenii. Originally Chytroeisphaeridia spinosa, subsequently Cleistosphaeridium? spinosum, thirdly Circulodinium spinosum, fourthly (and now) Trichodinium boltenhagenii. Questionable assignment: Lentin and Williams (1981, p.51).

Holotype: Boltenhagen, 1977, pl.7, figs.1a-b; Fauconnier and Masure, 2004, pl.15, fig.6.
Age: Cenomanian-Turonian.