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Protoellipsodinium densispinum
Protoellipsodinium densispinum Morgan, 1980
Holotype: Morgan, 1980, pl.24, figs.2-3
Locus typicus: Santos Oodnadatta, Australia
Stratum typicum: Middle Aptian-Cenomanian
Original description: Morgan, 1980, p. 30
Cyst autophragm elongate, subparallel sides with rounded ends; surface very densely covered with 2-3 µm long sharply pointed or slightly capitate spines which may arise from densely arranged elongate, discontinuous ridges 0.5-1 µm high, or may arise randomly from cyst surface subparallel alignment of ridges, if present, is largely parallel to cyst long axis, but disturbed at cingulum and boundaries between plate series; cingulum may be marked by parallel ridges, or less dense spines; sulcus may be clearly marked showing slight offset of cingulum; archeopyle large, precingular, extending almost to apex, showing small size of apical plate series; operculum free.
Affinities:
Morgan, 1980, p. 30-31: Much denser and shorter (3 µm) spines and surface ridges distinguish P. densispinum from P. spinocristotum Davey and Verdier 1971 (6 µm spines and moderately dense surface ridges) from the Albian of France and P. spinosum Davey and Verdier 1971 (few 9 µm spines and no surface ridges) from the Albian of France.
Holotype: Morgan, 1980, pl.24, figs.2-3
Locus typicus: Santos Oodnadatta, Australia
Stratum typicum: Middle Aptian-Cenomanian
Original description: Morgan, 1980, p. 30
Cyst autophragm elongate, subparallel sides with rounded ends; surface very densely covered with 2-3 µm long sharply pointed or slightly capitate spines which may arise from densely arranged elongate, discontinuous ridges 0.5-1 µm high, or may arise randomly from cyst surface subparallel alignment of ridges, if present, is largely parallel to cyst long axis, but disturbed at cingulum and boundaries between plate series; cingulum may be marked by parallel ridges, or less dense spines; sulcus may be clearly marked showing slight offset of cingulum; archeopyle large, precingular, extending almost to apex, showing small size of apical plate series; operculum free.
Affinities:
Morgan, 1980, p. 30-31: Much denser and shorter (3 µm) spines and surface ridges distinguish P. densispinum from P. spinocristotum Davey and Verdier 1971 (6 µm spines and moderately dense surface ridges) from the Albian of France and P. spinosum Davey and Verdier 1971 (few 9 µm spines and no surface ridges) from the Albian of France.