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Svalbardella kareniae
Svalbardella kareniae sp. nov., Sliwinska and Head, 2020
Holotype: Sliwinska and Head, 2020, Slide 158L-2
Type locality: eastern North Sea basin
Age: Early Oligocene
Original description: Sliwinska and Head, 2020:
Diagnosis:
A species of Svalbardella with a short and blunt apical horn and long and pointed antapical horn. The periphragm has a smooth to finely ornamented surface; the endophragm is smooth and slightly thicker than the periphragm. The antapical horn is at least 1.5 times as long as the apical horn.
Description:
Peridiniacean cyst comprising an ellipsoidal endocyst and fusiform pericyst. The pericyst has a single apical and antapical horn.
Wall: Periphragm and endophragm are closely appressed except at the horns. The periphragm is smooth to irregularly and minutely reticulate. The endophragm is smooth and slightly thicker than periphragm.
The apical horn is blunt, and the termination is tapering with a rounded tip. The antapical horn is conical, pointed distally, and at least 1.5 times longer than apical horn.
Tabulation: expressed by archeopyle alone
Archeopyle: intercalary type I (2a), isodeltaform (operculum free).
Dimensions:
Holotype: endocyst length 79 μm; pericyst length 156.5 μm; width 36 μm; apical horn length 28.5 μm; antapical horn length 49 μm. Range (n = 8): endocyst length 53–79 μm (mean 69.6 μm); pericyst length 115–166 μm (mean 148.4 μm); width 28–36.5 μm (mean 33.0 μm); apical horn length 14–34 μm (mean 26.2 μm); antapical horn length 34–66 μm (mean 53.8 μm).
Holotype: Sliwinska and Head, 2020, Slide 158L-2
Type locality: eastern North Sea basin
Age: Early Oligocene
Original description: Sliwinska and Head, 2020:
Diagnosis:
A species of Svalbardella with a short and blunt apical horn and long and pointed antapical horn. The periphragm has a smooth to finely ornamented surface; the endophragm is smooth and slightly thicker than the periphragm. The antapical horn is at least 1.5 times as long as the apical horn.
Description:
Peridiniacean cyst comprising an ellipsoidal endocyst and fusiform pericyst. The pericyst has a single apical and antapical horn.
Wall: Periphragm and endophragm are closely appressed except at the horns. The periphragm is smooth to irregularly and minutely reticulate. The endophragm is smooth and slightly thicker than periphragm.
The apical horn is blunt, and the termination is tapering with a rounded tip. The antapical horn is conical, pointed distally, and at least 1.5 times longer than apical horn.
Tabulation: expressed by archeopyle alone
Archeopyle: intercalary type I (2a), isodeltaform (operculum free).
Dimensions:
Holotype: endocyst length 79 μm; pericyst length 156.5 μm; width 36 μm; apical horn length 28.5 μm; antapical horn length 49 μm. Range (n = 8): endocyst length 53–79 μm (mean 69.6 μm); pericyst length 115–166 μm (mean 148.4 μm); width 28–36.5 μm (mean 33.0 μm); apical horn length 14–34 μm (mean 26.2 μm); antapical horn length 34–66 μm (mean 53.8 μm).