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Leptodinium elegans
Leptodinium elegans Cookson and Eisenack, 1965
Now Impagidinium. Originally Leptodinium, subsequently (and now) Impagidinium.
Holotype: Cookson and Eisenack, 1965, pl.12, figs.10,12; Jan du Chêne et al., 1986, pl.149, figs.5-10
Locus typicus: SW Victoria, Australia
Stratum typicum: Late Eocene
Original description: Cookson and Eisenack, 1965, p.123
Shell sphaerical, thick-walled (c.3-5 Ám, girdle equatorial, strongly helicoid, clearly defined and plated on the dorsal surface, only slightly so on the ventral surface. Borders of plates including those of the girdle, high, transparent, and granular with wavy or dotted edges. The longitudinal field wide and only partially plated and bordered. The plate adjacent to the antapex is always present as is the right-hand border of the field; the left-hand border is restricted to the hypotheca. The archaeopyle is formed by the detachment of a portion of plate 3"". Wall of shell finely and densely granular. Tabulation: 3", 6"", 5""", 1p, 1"""".
Dimensions: Holotype - overall length c.100 Ám, overall width c.100m Á; shell 70x70 Ám. Range - overall length c.80-120 Ám, overall width c.80-123 Ám; shell 67-81x67-86 Ám.
Affinities:
Cookson and Eisenack, 1965, p.123: L. elegans is readily distinguishable from L. dispertum, L.victorianum, and L. maculatum from Western Australia by the high and characteristically featured borders of the plates. In addition, it differs from all three in the restriction of the border of the longitudinal field to the hypotheca.
Now Impagidinium. Originally Leptodinium, subsequently (and now) Impagidinium.
Holotype: Cookson and Eisenack, 1965, pl.12, figs.10,12; Jan du Chêne et al., 1986, pl.149, figs.5-10
Locus typicus: SW Victoria, Australia
Stratum typicum: Late Eocene
Original description: Cookson and Eisenack, 1965, p.123
Shell sphaerical, thick-walled (c.3-5 Ám, girdle equatorial, strongly helicoid, clearly defined and plated on the dorsal surface, only slightly so on the ventral surface. Borders of plates including those of the girdle, high, transparent, and granular with wavy or dotted edges. The longitudinal field wide and only partially plated and bordered. The plate adjacent to the antapex is always present as is the right-hand border of the field; the left-hand border is restricted to the hypotheca. The archaeopyle is formed by the detachment of a portion of plate 3"". Wall of shell finely and densely granular. Tabulation: 3", 6"", 5""", 1p, 1"""".
Dimensions: Holotype - overall length c.100 Ám, overall width c.100m Á; shell 70x70 Ám. Range - overall length c.80-120 Ám, overall width c.80-123 Ám; shell 67-81x67-86 Ám.
Affinities:
Cookson and Eisenack, 1965, p.123: L. elegans is readily distinguishable from L. dispertum, L.victorianum, and L. maculatum from Western Australia by the high and characteristically featured borders of the plates. In addition, it differs from all three in the restriction of the border of the longitudinal field to the hypotheca.