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Eurydinium saxoniense
Eurydinium saxoniensis Marshall and Batten, 1988
Holotype: Marshall and Batten, 1988, pl.1, figs.10-11
Locus typicus: Misburg, West Germany
Stratum typicum: Late Cenomanian-Early Turonian
Original diagnosis: Marshall and Batten, 1988, p.92
Pericyst peridinioid, subpolygonal to oval in outline with or without short apical horn. Left antapical horn only, short and triangular. Endocyst rounded, peridinioid to subspherical; outline follows that of pericyst but lacks horns. Circumcavate; maximum wall separation in apical and antapical areas. Periphragm thin, smooth to scabrate and may display concentric folds around apex. Endophragm thin, smooth to scabrate. Paratabulation delineated by paracingulum and archeopyle only. Paracingulum faint, indicated by fine ridges or scabrae. Archeopyle intercalary, type I(2a). Periarcheopyle steno- to iso-deltaform, endoarcheopyle iso-deltaform. Both periand endo-opercula often remain attached along their posterior margin.
Dimensions: Pericyst length 52-66 µm, breadth 37-54 µm; endocyst length 34-55 µm, breadth 32-45 µm (40 specimens).
Affinities:
Marshall and Batten, 1988, p.93: There is considerable variation in the shape of this cyst with a gradation from forms having an angular peridinioid outline to those which are almost oval with a greatly reduced left antapical horn. Both Eurydinium ingramii (Cookson and Eisenack, 1970) Stover and Evitt, 1978 and Isabelidinium acuminatum (Cookson and Eisenack, 1958) Stover and Evitt, 1978 may appear similar to Eurydinium saxoniensis in their ambital outline but they differ in lacking evidence of a paracingulum. The endocyst of I. acuminatum also displays a small apical horn.
Holotype: Marshall and Batten, 1988, pl.1, figs.10-11
Locus typicus: Misburg, West Germany
Stratum typicum: Late Cenomanian-Early Turonian
Original diagnosis: Marshall and Batten, 1988, p.92
Pericyst peridinioid, subpolygonal to oval in outline with or without short apical horn. Left antapical horn only, short and triangular. Endocyst rounded, peridinioid to subspherical; outline follows that of pericyst but lacks horns. Circumcavate; maximum wall separation in apical and antapical areas. Periphragm thin, smooth to scabrate and may display concentric folds around apex. Endophragm thin, smooth to scabrate. Paratabulation delineated by paracingulum and archeopyle only. Paracingulum faint, indicated by fine ridges or scabrae. Archeopyle intercalary, type I(2a). Periarcheopyle steno- to iso-deltaform, endoarcheopyle iso-deltaform. Both periand endo-opercula often remain attached along their posterior margin.
Dimensions: Pericyst length 52-66 µm, breadth 37-54 µm; endocyst length 34-55 µm, breadth 32-45 µm (40 specimens).
Affinities:
Marshall and Batten, 1988, p.93: There is considerable variation in the shape of this cyst with a gradation from forms having an angular peridinioid outline to those which are almost oval with a greatly reduced left antapical horn. Both Eurydinium ingramii (Cookson and Eisenack, 1970) Stover and Evitt, 1978 and Isabelidinium acuminatum (Cookson and Eisenack, 1958) Stover and Evitt, 1978 may appear similar to Eurydinium saxoniensis in their ambital outline but they differ in lacking evidence of a paracingulum. The endocyst of I. acuminatum also displays a small apical horn.