From Fensome et al., 2019:
Tenua micibaculata (Jiabo, 1978, p.54, pl.7, figs.1–2) Fensome et al., 2019a, p.49.
Holotype: Jiabo, 1978, pl.7, fig.1; Fensome et al., 2019a, fig.18I.
Originally Canningia, subsequently Canningia?, thirdly Circulodinium?, fourthly (and now) Tenua? Eisenack.
Questionable assignment: Fensome et al. (2019a. p.49). Fensome et al. (2019a,p.49) recommended that this species be restricted to the holotype.
Age: early Tertiary.

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Original description Jiabo, 1978

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Comments Fensome et al., 2019a:

Tenua? micibaculata may be synonymous with Tenua hystrix. However, we refrain from proposing this synonymy because the morphology of Tenua? micibaculata is not clear, and hence the questionable assignment. We propose that this species be restricted to the holotype.

Stratigraphical occurrence. Jiabo (1978) recovered this species from the Lower Palaeogene of China.