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Samlandia chriskingii
From Iakovleva and Heilmann-Clausen, 2021
Samlandia chriskingii sp. nov. Plate 11, figures 8–12
Synonymy. Samlandia sp. 1 in Iakovleva and Heilmann-Clausen, 2010, pl. 10, figs 4, 6.
Holotype. Slide 2828-F2, England Finder coordinates N29/3-4; MGUH 32069.
Paratype. Slide 2828-F2, England Finder coordinates N28/4; MGUH 32070.
Type stratum and locality. Sample 17.0 m, Kulsary Formation, Aktulagay outcrop section, Kazakhstan.
Diagnosis. Small subspherical gonyaulacoid cyst with precingular archeopyle and without apical and antapical protrusions.
Description. A small subspherical cyst without apical and antapical protrusions. The cyst consists of an autophragm surrounded by an ectophragm. The autophragm is thick and its outer surface bears densely spaced protuberances connecting with the fragile membrane-like ectophragm, which completely surrounds the autocyst. The paratabulation is indicated by the archeopyle only. The archeopyle is precingular, relatively large, type P (3”). The operculum is free. Paracingulum and parasulcus are not recognized.
Dimensions. Holotype: ectocyst length 57 µm; ectocyst width 54 µm; autophragm thickness 3 µm; total wall thickness 9 µm. Paratype: ectocyst length 48 µm; autophragm thickness 3 µm; total wall thickness 6 µm. Dimensions of measured specimens: ectocyst length 41–57 µm (mean 49 µm); ectocyst width 36–54 µm (mean 48 µm); ectocyst dorsoventral dimension 35–53 µm (mean 43 µm); autophragm thickness 1.5–3 µm; total wall thickness 5–11 µm; 12 specimens measured.
Comparison. Samlandia chriskingii sp. nov. differs from other species of this genus by its smaller size and the absence of apical and antapical protrusions, as well as by the more densely spaced protuberances of the autophragm.
Stratigraphic range. Ypresian.
Derivation of name. In honor of the late British geologist and micropaleontologist Chris King who, together with David J. Ward, studied the Aktulagay section and provided the samples for the present study.
Samlandia chriskingii sp. nov. Plate 11, figures 8–12
Synonymy. Samlandia sp. 1 in Iakovleva and Heilmann-Clausen, 2010, pl. 10, figs 4, 6.
Holotype. Slide 2828-F2, England Finder coordinates N29/3-4; MGUH 32069.
Paratype. Slide 2828-F2, England Finder coordinates N28/4; MGUH 32070.
Type stratum and locality. Sample 17.0 m, Kulsary Formation, Aktulagay outcrop section, Kazakhstan.
Diagnosis. Small subspherical gonyaulacoid cyst with precingular archeopyle and without apical and antapical protrusions.
Description. A small subspherical cyst without apical and antapical protrusions. The cyst consists of an autophragm surrounded by an ectophragm. The autophragm is thick and its outer surface bears densely spaced protuberances connecting with the fragile membrane-like ectophragm, which completely surrounds the autocyst. The paratabulation is indicated by the archeopyle only. The archeopyle is precingular, relatively large, type P (3”). The operculum is free. Paracingulum and parasulcus are not recognized.
Dimensions. Holotype: ectocyst length 57 µm; ectocyst width 54 µm; autophragm thickness 3 µm; total wall thickness 9 µm. Paratype: ectocyst length 48 µm; autophragm thickness 3 µm; total wall thickness 6 µm. Dimensions of measured specimens: ectocyst length 41–57 µm (mean 49 µm); ectocyst width 36–54 µm (mean 48 µm); ectocyst dorsoventral dimension 35–53 µm (mean 43 µm); autophragm thickness 1.5–3 µm; total wall thickness 5–11 µm; 12 specimens measured.
Comparison. Samlandia chriskingii sp. nov. differs from other species of this genus by its smaller size and the absence of apical and antapical protrusions, as well as by the more densely spaced protuberances of the autophragm.
Stratigraphic range. Ypresian.
Derivation of name. In honor of the late British geologist and micropaleontologist Chris King who, together with David J. Ward, studied the Aktulagay section and provided the samples for the present study.