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Eurydinium ellipticum
Eurydinium ellipticum Mao Shaozhi and Mohr, 1992
Holotype: Mao Shaozhi and Mohr, 1992, pl.2, fig.9
Locus typicus: ODP Hole 748c, Banzare Bank, S Indian Ocean
Stratum typicum: Maastrichtian
Original description: Mao Shaozhi and Mohr, 1992, p. 318
Cyst circumcavate. Apex rounded, truncate, or slightly concave in the middle anterior without any horns or projections; antapex almost rounded or slightly asymmetrical with one corner less rounded than the other. Endocyst subcircular to elliptical in outline. Wall two layered; both periphragm and endophragm are thin and smooth. Ambital pericoel, where developed, is as narrow as less than one-tenth of the total width of the cyst. Archeopyle intercalary [2a], standard hexastyle,iso-thetaform, some rounded at each corner; AI = 0.48 - 0.61; operculum usually free. No indications of paracingulum or parasulcus are present.
Size. Length of cysts, 78.5-100.5 (holotype 100) Ám; width of cysts, 47.5-86.5 (holotype 71) Ám; 20 specimens measured.
Affinities: Mao Shaozhi and Mohr, 1992, p. 318
This species is distinguished by its elliptical shape with no apical or antapical horns, for which reason it is better allocated to genus Eurydinium than to Isabelidinium or Manumiella (Stover and Evitt, 1978; Stover and Williams, 1987). The large size and the elliptical shape of the species distinguish it from any previously described species of Eurydinium.
Holotype: Mao Shaozhi and Mohr, 1992, pl.2, fig.9
Locus typicus: ODP Hole 748c, Banzare Bank, S Indian Ocean
Stratum typicum: Maastrichtian
Original description: Mao Shaozhi and Mohr, 1992, p. 318
Cyst circumcavate. Apex rounded, truncate, or slightly concave in the middle anterior without any horns or projections; antapex almost rounded or slightly asymmetrical with one corner less rounded than the other. Endocyst subcircular to elliptical in outline. Wall two layered; both periphragm and endophragm are thin and smooth. Ambital pericoel, where developed, is as narrow as less than one-tenth of the total width of the cyst. Archeopyle intercalary [2a], standard hexastyle,iso-thetaform, some rounded at each corner; AI = 0.48 - 0.61; operculum usually free. No indications of paracingulum or parasulcus are present.
Size. Length of cysts, 78.5-100.5 (holotype 100) Ám; width of cysts, 47.5-86.5 (holotype 71) Ám; 20 specimens measured.
Affinities: Mao Shaozhi and Mohr, 1992, p. 318
This species is distinguished by its elliptical shape with no apical or antapical horns, for which reason it is better allocated to genus Eurydinium than to Isabelidinium or Manumiella (Stover and Evitt, 1978; Stover and Williams, 1987). The large size and the elliptical shape of the species distinguish it from any previously described species of Eurydinium.