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Tenua baculata
From Fensome et al., 2019:
Tenua baculata Dodekova, 1975, p.28–29, pl.6, figs.1–3; text-fig.7.
Holotype: Dodekova, 1975, pl.6, figs.1–3
NOW Sentusidinium. Originally Tenua Eisenack, subsequently (and now) Sentusidinium, thirdly Barbatacysta.
Taxonomic junior synonyms: Tenua (al. Sentusidinium) biornata, Sentusidinium biornatum subsp. biornatum, Sentusidinium biornatum subsp. conspicula (al. Batiacasphaera conspicula), Kallosphaeridium biparatum, Batiacasphaera hystricosa, and Batiacasphaera oligacantha, all according to Wood et al. (2016, p.83).
Age: late Bathonian.
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Original description: Dodekova, 1975, p.28–29: Tenua baculata
Tenua baculata sp. N. (Pl. VI, figs. 1-3)
Derivation of ame : Latin : baculatus – rod-like, on account of the dominating rod-like processes
Type”Holotype – slide 1053-2, Borehole R-54, Gurkovo, at 1341m depth, Upper Bathonian.
Material: 8 specimens
Dimensions (in µm): holotype: length (apex lacking – 59, breadth – 65, length of processes – 3-5.
Description: Spheroidal to subsphaeriodal 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.
Remarks: he rare and short processes of different types, yet dominantly baculate, distinguish Tenua baculata from all known species of the genus.
Occurrence: Borehole R-54, Gurkovo.
Tenua baculata Dodekova, 1975, p.28–29, pl.6, figs.1–3; text-fig.7.
Holotype: Dodekova, 1975, pl.6, figs.1–3
NOW Sentusidinium. Originally Tenua Eisenack, subsequently (and now) Sentusidinium, thirdly Barbatacysta.
Taxonomic junior synonyms: Tenua (al. Sentusidinium) biornata, Sentusidinium biornatum subsp. biornatum, Sentusidinium biornatum subsp. conspicula (al. Batiacasphaera conspicula), Kallosphaeridium biparatum, Batiacasphaera hystricosa, and Batiacasphaera oligacantha, all according to Wood et al. (2016, p.83).
Age: late Bathonian.
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Original description: Dodekova, 1975, p.28–29: Tenua baculata
Tenua baculata sp. N. (Pl. VI, figs. 1-3)
Derivation of ame : Latin : baculatus – rod-like, on account of the dominating rod-like processes
Type”Holotype – slide 1053-2, Borehole R-54, Gurkovo, at 1341m depth, Upper Bathonian.
Material: 8 specimens
Dimensions (in µm): holotype: length (apex lacking – 59, breadth – 65, length of processes – 3-5.
Description: Spheroidal to subsphaeriodal 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.
Remarks: he rare and short processes of different types, yet dominantly baculate, distinguish Tenua baculata from all known species of the genus.
Occurrence: Borehole R-54, Gurkovo.