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Isabelidinium extremum
Isabelidinium? extremum (Cookson and Eisenack, 1974) Stover and Evitt, 1978
NOW Spongodinium?. Originally Deflandrea, subsequently (and now) Spongodinium?, thirdly Isabelidinium?. Questionable assignment: Stover and Evitt (1978, p.109).
Williams et al. (2017) retained this species questionably in Spongodinium.
Holotype: Cookson and Eisenack, 1974, pl.20, fig.4
Locus typicus: Perth Basin, Australia
Stratum typicum: Albian-Cenomanian
Translation Cookson and Eisenack, 1974: LPP
Original diagnosis: Cookson and Eisenack, 1974, p. 48: Deflandrea extrema
A species of the genus Deflandrea with a relatively thick wall, an in apical view circular endophragm and a thin-walled closely appressed periphragm. The short, pointed apical horn has a widened base, the two antapical horns are wide and blunt; all three are just weakly developed. The periphragm is folded with an irregular, small-meshed surface. Girdle not visible in apical view. Archaeopyle trapezoidal.
Dimensions: Endophragm ca. 85x85 µm, overall ca. 98x94 µm.
NOW Spongodinium?. Originally Deflandrea, subsequently (and now) Spongodinium?, thirdly Isabelidinium?. Questionable assignment: Stover and Evitt (1978, p.109).
Williams et al. (2017) retained this species questionably in Spongodinium.
Holotype: Cookson and Eisenack, 1974, pl.20, fig.4
Locus typicus: Perth Basin, Australia
Stratum typicum: Albian-Cenomanian
Translation Cookson and Eisenack, 1974: LPP
Original diagnosis: Cookson and Eisenack, 1974, p. 48: Deflandrea extrema
A species of the genus Deflandrea with a relatively thick wall, an in apical view circular endophragm and a thin-walled closely appressed periphragm. The short, pointed apical horn has a widened base, the two antapical horns are wide and blunt; all three are just weakly developed. The periphragm is folded with an irregular, small-meshed surface. Girdle not visible in apical view. Archaeopyle trapezoidal.
Dimensions: Endophragm ca. 85x85 µm, overall ca. 98x94 µm.