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Deflandrea pentaradiata
Deflandrea pentaradiata Cookson and Eisenack, 1965
Now Alterbidinium?. Originally Deflandrea, subsequently (and now) Alterbidinium?. See also Alterbia (combination illegitimate).
Holotype: Cookson and Eisenack, 1965, pl.18, fig.1
Locus typicus: SW Victoria, Australia
Stratum typicum: Paleocene
Original description: Cookson and Eisenack, 1965, p.139
Shell rather flat, somewhat longer than broad, with five ¦ deeply concave sides. Apical and antapical horns strongly developed; apical horn bluntly pointed; antapical horns parallel to or divergent from one another and sharply pointed. Lateral projections broad and blunt with a faintly developed notch resulting from the girdle. Wall of shell thin, smooth or with fine longitudinal striae, especially in the vicinity of the girdle (Pl. 18, fig. 2), composed of dot-like thickenings. Girdle circular, marked by two low, narrow ridges. Longitudinal furrowrelatively broad, bounded by ¦ clearly marked curved ledges. In the mid-line of the ventral surface slightly below the ends of the girdle a curved slit (Pl. 18, fig. 1) with thickened edges indicative of a flagella-pore is evident in well-preserved specimens.
The capsule, while roughly oval in outline, tends to follow the outline of the shell itself; its wall is unthickened and finely, and usually faintly, granular. The archeopyle is trapezoidal with rounded corners and extends from near the girdle to beyond the base of the apical horn.
Dimensions: Holotype: overall length 162 Ám; overall width 128 Ám; capsule 86x95 Ám. Range: overall length 159-171 Ám; overall width 116-130 Ám; capsule length 76-97 Ám, width 82-96 Ám.
Now Alterbidinium?. Originally Deflandrea, subsequently (and now) Alterbidinium?. See also Alterbia (combination illegitimate).
Holotype: Cookson and Eisenack, 1965, pl.18, fig.1
Locus typicus: SW Victoria, Australia
Stratum typicum: Paleocene
Original description: Cookson and Eisenack, 1965, p.139
Shell rather flat, somewhat longer than broad, with five ¦ deeply concave sides. Apical and antapical horns strongly developed; apical horn bluntly pointed; antapical horns parallel to or divergent from one another and sharply pointed. Lateral projections broad and blunt with a faintly developed notch resulting from the girdle. Wall of shell thin, smooth or with fine longitudinal striae, especially in the vicinity of the girdle (Pl. 18, fig. 2), composed of dot-like thickenings. Girdle circular, marked by two low, narrow ridges. Longitudinal furrowrelatively broad, bounded by ¦ clearly marked curved ledges. In the mid-line of the ventral surface slightly below the ends of the girdle a curved slit (Pl. 18, fig. 1) with thickened edges indicative of a flagella-pore is evident in well-preserved specimens.
The capsule, while roughly oval in outline, tends to follow the outline of the shell itself; its wall is unthickened and finely, and usually faintly, granular. The archeopyle is trapezoidal with rounded corners and extends from near the girdle to beyond the base of the apical horn.
Dimensions: Holotype: overall length 162 Ám; overall width 128 Ám; capsule 86x95 Ám. Range: overall length 159-171 Ám; overall width 116-130 Ám; capsule length 76-97 Ám, width 82-96 Ám.