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Phelodinium anisum
Phelodinium anisum Mao Shaozhi and Norris, 1988, p.52, pl.15, figs.14–16.
Holotype: Mao Shaozhi and Norris, 1988, pl.15, fig.16.
Locus typicus: Quimugen Formation, Quimugen section, China
Stratum typicum: Late Palaeocene-Late Eocene
Original diagnosis: Mao Shaozhi and Norris, p.52
Cyst proximate, cornucavate, with a subrhombic to pentagonal ambitus. Apical horn and left antapical horn well developed and pointed; right antapical horn reduced or absent. Periphragm very thin, smooth, and transparent; separated from the endophragm only at the bases of the horns, appressed elsewhere. Endoblast rhombic to pentagonal, with four angles at apical, two lateral, and left antapical regions. Archaeopyle intercalary, type(I), standard hexa 2a, with transverse AI 0.5 to 0.6; operculum free or attached posteriorly.
Original description: Mao Shaozhi and Norris, p.52
Cyst subrhombic, squarish and subpentagonal in ambital view, length greater than width. Epitract triangular, with straight or slightly convex sides; hypotract with a subtriangular to trapzoidal ambitus. Ambitus asymmetrical laterally, with only the left antapical horn well developed, the right antapical horn reduced to a small size or completely absent. Apical and left antapical horns (which are up to 10µm to 7µm long repectively) distinct and pointed. Periphragm seperatedfrom the endophragm only at the bases of either all the horns or one or two of the horns; very thin, smooth, transparent, and thin but thicker than the periphragm. Endoblast typically with blunted or rounded horns, whereas periphragm usually drawn out and separated from the endophragm to produce pointed horns. Cingulum planar to slightly helicoid, marked by folds.
Dimensions: Length (incl. horns) 63 µm to 80 µm (holotype 75 µm), width 40 µm to 53 µm (holotype 48 µm); 30 specimens measured.
Holotype: Mao Shaozhi and Norris, 1988, pl.15, fig.16.
Locus typicus: Quimugen Formation, Quimugen section, China
Stratum typicum: Late Palaeocene-Late Eocene
Original diagnosis: Mao Shaozhi and Norris, p.52
Cyst proximate, cornucavate, with a subrhombic to pentagonal ambitus. Apical horn and left antapical horn well developed and pointed; right antapical horn reduced or absent. Periphragm very thin, smooth, and transparent; separated from the endophragm only at the bases of the horns, appressed elsewhere. Endoblast rhombic to pentagonal, with four angles at apical, two lateral, and left antapical regions. Archaeopyle intercalary, type(I), standard hexa 2a, with transverse AI 0.5 to 0.6; operculum free or attached posteriorly.
Original description: Mao Shaozhi and Norris, p.52
Cyst subrhombic, squarish and subpentagonal in ambital view, length greater than width. Epitract triangular, with straight or slightly convex sides; hypotract with a subtriangular to trapzoidal ambitus. Ambitus asymmetrical laterally, with only the left antapical horn well developed, the right antapical horn reduced to a small size or completely absent. Apical and left antapical horns (which are up to 10µm to 7µm long repectively) distinct and pointed. Periphragm seperatedfrom the endophragm only at the bases of either all the horns or one or two of the horns; very thin, smooth, transparent, and thin but thicker than the periphragm. Endoblast typically with blunted or rounded horns, whereas periphragm usually drawn out and separated from the endophragm to produce pointed horns. Cingulum planar to slightly helicoid, marked by folds.
Dimensions: Length (incl. horns) 63 µm to 80 µm (holotype 75 µm), width 40 µm to 53 µm (holotype 48 µm); 30 specimens measured.