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Dinogymnium albertii
Dinogymnium albertii Clarke and Verdier, 1967
Holotype: Clarke and Verdier, 1967, pl.17, fig.4
Locus typicus: Culver Cliff, I.O.W
Stratum typicum: Santonian
Original diagnosis Clarke and Verdier, 1967, p.33:
A species of Dinogymniun possessing a micronegative sculpture (perforations) on the ridges and grooves on both epitheca and hypotheca.
Original description Clarke and Verdier, 1967, p.33:
Outline rounded, elongate with longitudinal ridges, bordered by thickenings on each side, present on both hypotheca and epitheca. Hypotheca and epitheca more or less equal. Girdle obvious, fairly wide but not very deep. Longitudinal furrow present. A micronegative sculpture (perforations) is present on the grooves and ridges but is absent from the girdle area.
Measurements: Length 60-70 Ám, breadth 40-50 Ám, width of girdle (max.) 7-12 Ám.
Comparison:
D. albertii differs from D. digitum (Deflandre) Evitt, Clarke and Verdier in overall shape and the more prominent ridges, from D. westralium (Cookson and Eisenack) Evitt, Clarke and Verdier in the presence of a longitudinal furrow and from all other species in the presence of a micronegative sculpture.
Holotype: Clarke and Verdier, 1967, pl.17, fig.4
Locus typicus: Culver Cliff, I.O.W
Stratum typicum: Santonian
Original diagnosis Clarke and Verdier, 1967, p.33:
A species of Dinogymniun possessing a micronegative sculpture (perforations) on the ridges and grooves on both epitheca and hypotheca.
Original description Clarke and Verdier, 1967, p.33:
Outline rounded, elongate with longitudinal ridges, bordered by thickenings on each side, present on both hypotheca and epitheca. Hypotheca and epitheca more or less equal. Girdle obvious, fairly wide but not very deep. Longitudinal furrow present. A micronegative sculpture (perforations) is present on the grooves and ridges but is absent from the girdle area.
Measurements: Length 60-70 Ám, breadth 40-50 Ám, width of girdle (max.) 7-12 Ám.
Comparison:
D. albertii differs from D. digitum (Deflandre) Evitt, Clarke and Verdier in overall shape and the more prominent ridges, from D. westralium (Cookson and Eisenack) Evitt, Clarke and Verdier in the presence of a longitudinal furrow and from all other species in the presence of a micronegative sculpture.