From Fensome et al., 2019:
Circulodinium spinosum (Boltenhagen, 1977, p.54–55, pl.7, figs.1a–b,2,3a–b,4a–b,5a–b) Islam, 1993, p.83. Emendation: Masure in Fauconnier and Masure, 2004, p.116–117, as Trichodinium boltenhagenii. Holotype: Boltenhagen, 1977, pl.7, figs.1a–b; Fauconnier and Masure, 2004, pl.15, fig.6. NOW Trichodinium boltenhagenii. Originally Chytroeisphaeridia spinosa, subsequently Cleistosphaeridium? spinosum, thirdly Circulodinium spinosum, fourthly (and now) Trichodinium boltenhagenii. Age: Cenomanian–Turonian.

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