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Sentusidinium brevispinosum
Sentusidinium brevispinosa (Courtinat in Courtinat and Gaillard, 1980, p.60, pl.9, figs.4,7,11; text-fig.10e) Courtinat, 1989, p.185.
Holotype: Courtinat and Gaillard, 1980, p.60, pl.9, fig.7; Fauconnier and Masure, 2004, pl.11, fig.1.
Originally Sentusidinium, subsequently (and now) Barbatacysta. Taxonomic junior synonym: Barbatacysta lemoignei, according to Courtinat in Fauconnier and Masure (2004, p.83).
Age: late Oxfordian.
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Sentusidinium brevispinosum nov. sp.
pl. 9, fig. 4 and 7; text-fig. 10e
Holotype: slide T 51 97 - 11/63, 8; Paleobotany Laboratory Collection, University of Lyon.
Derivatio nomninis: referring to the size of the processes.
Locus typicus: Trept, Montbron quarry (Isère).
Stratum typicum: Level 51 - Limestone interbank, Bimammatum zone.
Diagnosis: Proximate cyst, spherical to subspherical; autophragm densely covered with very short processes (200 to 500). Conical processes, shaped like branched or capitate rods; paracingulum clearly defined; apical archaeopyle circular to subpolygonal, bordered by processes.
Description:
Shape: Spherical to subspherical.
Specific features: Smooth autophragm, lined with small cones, with here and there, and in greater or lesser numbers depending on the specimen, rod-shaped, branched, or capitate processes. These appendages are very numerous.
Archaeopyle: apical, with a zigzag margin, and re-entrant angles.
Paratabulation: not indicated other than by the archaeopyle and the paracingulum.
Paracingulum: indicated by the alignment of processes in two parallel rows and delimiting a space.
Dimensions:
Holotype:
Length: 58.3 µm
Width: 58.3 µm
Process length: 3.2 µm
Other specimens:
Shell length without operculum: 41 to 58 µm
Process length: 0.8 to 3.2 µm
Process length/shell width ratio: less than 0.05
Measured specimens: 43.
Distribution: Southern Jura: Trept, Upper Oxfordian.
Holotype: Courtinat and Gaillard, 1980, p.60, pl.9, fig.7; Fauconnier and Masure, 2004, pl.11, fig.1.
Originally Sentusidinium, subsequently (and now) Barbatacysta. Taxonomic junior synonym: Barbatacysta lemoignei, according to Courtinat in Fauconnier and Masure (2004, p.83).
Age: late Oxfordian.
----------------------------------------------------------------------------------------------------------------------------------
Sentusidinium brevispinosum nov. sp.
pl. 9, fig. 4 and 7; text-fig. 10e
Holotype: slide T 51 97 - 11/63, 8; Paleobotany Laboratory Collection, University of Lyon.
Derivatio nomninis: referring to the size of the processes.
Locus typicus: Trept, Montbron quarry (Isère).
Stratum typicum: Level 51 - Limestone interbank, Bimammatum zone.
Diagnosis: Proximate cyst, spherical to subspherical; autophragm densely covered with very short processes (200 to 500). Conical processes, shaped like branched or capitate rods; paracingulum clearly defined; apical archaeopyle circular to subpolygonal, bordered by processes.
Description:
Shape: Spherical to subspherical.
Specific features: Smooth autophragm, lined with small cones, with here and there, and in greater or lesser numbers depending on the specimen, rod-shaped, branched, or capitate processes. These appendages are very numerous.
Archaeopyle: apical, with a zigzag margin, and re-entrant angles.
Paratabulation: not indicated other than by the archaeopyle and the paracingulum.
Paracingulum: indicated by the alignment of processes in two parallel rows and delimiting a space.
Dimensions:
Holotype:
Length: 58.3 µm
Width: 58.3 µm
Process length: 3.2 µm
Other specimens:
Shell length without operculum: 41 to 58 µm
Process length: 0.8 to 3.2 µm
Process length/shell width ratio: less than 0.05
Measured specimens: 43.
Distribution: Southern Jura: Trept, Upper Oxfordian.