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Stichodinium galliciense
Stichodinium galliciense Iakovleva, 2016, p.18 (on PDF initially published online), pl.1, figs.1–2,4–5,7–8; text-fig.4a (part).
Holotype: Iakovleva, 2016, pl.7, figs.3,6.
Age: earliest Eocene.
Original description (Iakovleva, 2016)
Diagnosis. A species of Stichodinium with pentagonal outline and sutural membranes surmounted by processes of varying width.
Description. A mid-size, circumcavate cyst with pentagonal outline. All the horns are weakly developed. Periphragm thin, with sutural membranes or ridges from which arise processes of varying width but of more or less the same height and which can be simple, branched or bifurcate. Endocyst almost subcircular, slightly extended in the lateral regions. Endophragm thin and smooth. Archaeopyle latiepeliform, operculum of observed specimens is free.
Dimensions.
Holotype: pericyst length 77 µm; pericyst width 86 µm; endocyst length 63 µm; endocyst width 72 µm. Paratype: pericyst length 88 µm; pericyst width 73 µm; endocyst length 62 µm; endocyst width 54 µm. Dimensions of measured specimens: pericyst length 59–90 µm (mean value 75 µm); pericyst width 64–99 µm (mean value 79 µm); endocyst length 49–63 µm (mean value 58 µm); endocyst width 54–72 µm (mean value 52 µm). Eight specimens measured.
Comparison.
Stichodinium galliciense differs from other Stichodinium species (S.? lineidentatum, S. subtile, S. parisiense, S. symagicum) by its distinctive pentagonal outline and well-pronounced outline ornamentation by outgrowths. It differs from Stichodinium? lineidentatum, S. subtile and S. elegantulum in the character of sutural ornamentation expressed by sutural membranes or ridges with processes.
Stratigraphical range. Earliest Eocene.
Derivation of name. From the Latin Gallia (France) in reference to the country from which the holotype was recovered.
Holotype: Iakovleva, 2016, pl.7, figs.3,6.
Age: earliest Eocene.
Original description (Iakovleva, 2016)
Diagnosis. A species of Stichodinium with pentagonal outline and sutural membranes surmounted by processes of varying width.
Description. A mid-size, circumcavate cyst with pentagonal outline. All the horns are weakly developed. Periphragm thin, with sutural membranes or ridges from which arise processes of varying width but of more or less the same height and which can be simple, branched or bifurcate. Endocyst almost subcircular, slightly extended in the lateral regions. Endophragm thin and smooth. Archaeopyle latiepeliform, operculum of observed specimens is free.
Dimensions.
Holotype: pericyst length 77 µm; pericyst width 86 µm; endocyst length 63 µm; endocyst width 72 µm. Paratype: pericyst length 88 µm; pericyst width 73 µm; endocyst length 62 µm; endocyst width 54 µm. Dimensions of measured specimens: pericyst length 59–90 µm (mean value 75 µm); pericyst width 64–99 µm (mean value 79 µm); endocyst length 49–63 µm (mean value 58 µm); endocyst width 54–72 µm (mean value 52 µm). Eight specimens measured.
Comparison.
Stichodinium galliciense differs from other Stichodinium species (S.? lineidentatum, S. subtile, S. parisiense, S. symagicum) by its distinctive pentagonal outline and well-pronounced outline ornamentation by outgrowths. It differs from Stichodinium? lineidentatum, S. subtile and S. elegantulum in the character of sutural ornamentation expressed by sutural membranes or ridges with processes.
Stratigraphical range. Earliest Eocene.
Derivation of name. From the Latin Gallia (France) in reference to the country from which the holotype was recovered.