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Impagidinium elegans
Impagidinium elegans (Cookson and Eisenack, 1965) Stover and Evitt, 1978
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: Leptodinium elegans
Shell sphaerical, thick-walled (c.3-5Á, 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 µm, overall width c.100 µm; shell 70x70 µm. Range - overall length c.80-120 µm, overall width c.80-123 µm; shell 67-81x67-86 µm.
Affinities:
Cookson and Eisenack, 1965, p.123: Leptodinium elegans
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.
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: Leptodinium elegans
Shell sphaerical, thick-walled (c.3-5Á, 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 µm, overall width c.100 µm; shell 70x70 µm. Range - overall length c.80-120 µm, overall width c.80-123 µm; shell 67-81x67-86 µm.
Affinities:
Cookson and Eisenack, 1965, p.123: Leptodinium elegans
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.