From Fensome et al., 2019:
Tenua dubia Jain and Millepied, 1975, p.152, pl.5, figs.75–76.
Holotype: Jain and Millepied, 1975, pl.5, fig.76; Fensome et al., 2019a, fig.18D.
NOW Cyclonephelium?. Originally (and now) Tenua Eisenack, subsequently Cyclonephelium, thirdly Cyclonephelium?.
Fensome et al. (2019a, p.47) retained this species in Tenua Eisenack
Age: Campanian–Maastrichtian.

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Original description Jain and Millepied, 1975:

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Comments Fensome et al., 2019a:

Jain & Millepied (1975, p. 152) described this species as being “… covered with long, bifurcate processes. As the species lacks dorsoventral areas devoid of ornament and the ornament is less that 25% of the maximum cyst width, we retain it in Tenua.

Stratigraphical occurrence. Jain & Millepied (1975) recovered this species from the Campanian–Maastrichtian of western Africa.