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Senegalinium pallidum
Senegalinium pallidum Lucas-Clark, 2006, p.200, pl.3, figs.10–11,13–14.
Holotype: Lucas-Clark, 2006, pl.3, figs.10–11.
Age: late Paleocene.
Original description (Lucas-Clark, 2006):
Senegalinium pallidum sp. nov. Plate 3, figs. 10–11, 13–14
Holotype. Plate 3, figs. 10–11. South Carolina, Savannah River Site core P21, 109.5 m, sample 8643.1139, slide c, CGS Zeiss Sh., coordinates 105.0 × 18.2, England Finder reference T42/1. Carnegie Museum of Natural History CM 19152.
Derivation of Name. From the Latin pallidus, meaning pale or wan.
Diagnosis. Medium to large pale peridinioid cyst. Circumcavate, rounded ovoidal to rectangular in shape with short apical and antapical horns. Thin walled and pale. Distinguished by its size, shape, and pale, thin walls.
Description, Medium to large proximate peridinioid, cornucavate cysts, dorsoventrally compressed with short apical and antapical horns. The apical horn consists of a short knob-like protrusion; antapical horns are slight protrusions sometimes formed into short spines. The antapical horns are approximately equally developed. Endophragm smooth, thin, appressed to periphragm except beneath horns. Periphragm also thin, unornamented but with irregular folds and wrinkles not related to tabulation. Endocyst widely ovoidal; pericyst roundly, widely ovoidal to slightly peridinioid in shape; lateral margins convex smoothly from a pical to antapical regions, antapical margin straight to slightly concave. Tabulation indicated by archeopyle and by faint wrinkling at cingulum that is expressed as a slight bulge in the lateral margins of the periphragm. Archeopyle type I/I (2a), rounded, probably hexagonal, but of somewhat uncertain shape, probably isodeltaform with rounded corners, difficult to observe. Sulcus not indicated.
Dimensions. Length, 110–120 μm; width, 90–100 μm (2 specimens measured).
Remarks. This species is rare. It is distinguished by the thin walls, irregularly folded and wrinkled surface, and its wide, rounded shape and small inconspicuous horns.
Comparison. This species resembles Chatangiella? dakotaensis, but it has a 2a archeopyle, thinner walls, and lacks apical and antapical pericoels. It resembles Senegalinium simplex sp. nov., but has a thinner walled endocyst, is not circumcavate, and is generally larger.
Occurrence in This Study. Upper Paleocene, upper Ellenton Formation, upper Paleocene Snapp Formation, Savanna River Site and surrounding area, South Carolina.
Holotype: Lucas-Clark, 2006, pl.3, figs.10–11.
Age: late Paleocene.
Original description (Lucas-Clark, 2006):
Senegalinium pallidum sp. nov. Plate 3, figs. 10–11, 13–14
Holotype. Plate 3, figs. 10–11. South Carolina, Savannah River Site core P21, 109.5 m, sample 8643.1139, slide c, CGS Zeiss Sh., coordinates 105.0 × 18.2, England Finder reference T42/1. Carnegie Museum of Natural History CM 19152.
Derivation of Name. From the Latin pallidus, meaning pale or wan.
Diagnosis. Medium to large pale peridinioid cyst. Circumcavate, rounded ovoidal to rectangular in shape with short apical and antapical horns. Thin walled and pale. Distinguished by its size, shape, and pale, thin walls.
Description, Medium to large proximate peridinioid, cornucavate cysts, dorsoventrally compressed with short apical and antapical horns. The apical horn consists of a short knob-like protrusion; antapical horns are slight protrusions sometimes formed into short spines. The antapical horns are approximately equally developed. Endophragm smooth, thin, appressed to periphragm except beneath horns. Periphragm also thin, unornamented but with irregular folds and wrinkles not related to tabulation. Endocyst widely ovoidal; pericyst roundly, widely ovoidal to slightly peridinioid in shape; lateral margins convex smoothly from a pical to antapical regions, antapical margin straight to slightly concave. Tabulation indicated by archeopyle and by faint wrinkling at cingulum that is expressed as a slight bulge in the lateral margins of the periphragm. Archeopyle type I/I (2a), rounded, probably hexagonal, but of somewhat uncertain shape, probably isodeltaform with rounded corners, difficult to observe. Sulcus not indicated.
Dimensions. Length, 110–120 μm; width, 90–100 μm (2 specimens measured).
Remarks. This species is rare. It is distinguished by the thin walls, irregularly folded and wrinkled surface, and its wide, rounded shape and small inconspicuous horns.
Comparison. This species resembles Chatangiella? dakotaensis, but it has a 2a archeopyle, thinner walls, and lacks apical and antapical pericoels. It resembles Senegalinium simplex sp. nov., but has a thinner walled endocyst, is not circumcavate, and is generally larger.
Occurrence in This Study. Upper Paleocene, upper Ellenton Formation, upper Paleocene Snapp Formation, Savanna River Site and surrounding area, South Carolina.