Barbatacysta baculata, (Dodekova, 1975), Courtinat, 1989

Originally Tenua Eisenack, 1958, subsequently Sentusidinium, thirdly (and now) Barbatacysta.

Holotype: Dodekova, 1975, pl.6, figs.1-3
Age: Late Bathonian

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Original description as Tenua baculata: [Dodekova, 1975, p.28–29]:

Description:
Spheroidal to subspheroidal proximate cyst. In all observed specimens the apex is lacking. The archeopyle margin with sulcal notch and accessory archeopyle sutures. The processes are rare, short and of varying types. Baculate, gemmate, subconical or flared processes may be observed. Some neighboring processes join together from the proximal to the distal end, by some of them cavities in the base may remain.
The processes are hollow, distally closed.
The endophragm is thick, the periphragm is thinner and makes up the processes. The surface of the pericyst is shagreenate. Traces of furrows and distinct tabulation are not seen.
The archeopyle is apical.

Dimensions (in µm):
holotype: length apex lacking – 59, breadth – 65, length of processes – 3-5.

Remarks:
The rare and short processes of different types, yet dominantly baculate, distinguish Tenua baculata from all known species of the genus.