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Isabelidinium campbellensis
Isabelidinium campbellensis (Wilson, 1967b, p.225, figs.2–3) Lebedeva, 2000, p.118.
Originally Deflandrea, subsequently Chatangiella, thirdly (and now) Isabelidinium.
Holotype: Wilson, 1967b, fig.2.
Locus typicus: Head of Perseverance Harbour, Campbell Island, New Zealand
Age: Maastrichtian (see Wilson, 1972).
Original description: Wilson, 1967, p.225: Deflandrea campbellensis
Test large, dorso-ventrally flattened; broadly rounded epitheca tapers to a fairly blunt apical horn (l=41-55 µm) sometimes terminated by a papilla. Anterior of inner cyst flat; breadth grater than length. Antapical horns unequal, right horn beiing slightly longer than left and usually terminated by a papilla. Surface of outer cyst smooth. Prominent spiral transverse girdle tripartite on dorsal surface. Atabulate. Archaeopyle fairly large, trapezoidal, intercalary, located on dorsal epitheca. Opening of inner cyst semi-apical to apical.
Dimensions: Holotype: l=153 µm, b=83 µm, inner cyst 63x80 µm. Range (6 specimens): l=146(162)179 µm, b=72(85)99) µm.
Affinities:
Wilson, 1967, p.225: Deflandrea campbellensis
Deflandrea campbellensis has a somewhat similar shape to Deflandrea bakeri (Defl. and Cooks., 1955), but differs in overall size and in the prominence and structure of the transverse girdle.
Originally Deflandrea, subsequently Chatangiella, thirdly (and now) Isabelidinium.
Holotype: Wilson, 1967b, fig.2.
Locus typicus: Head of Perseverance Harbour, Campbell Island, New Zealand
Age: Maastrichtian (see Wilson, 1972).
Original description: Wilson, 1967, p.225: Deflandrea campbellensis
Test large, dorso-ventrally flattened; broadly rounded epitheca tapers to a fairly blunt apical horn (l=41-55 µm) sometimes terminated by a papilla. Anterior of inner cyst flat; breadth grater than length. Antapical horns unequal, right horn beiing slightly longer than left and usually terminated by a papilla. Surface of outer cyst smooth. Prominent spiral transverse girdle tripartite on dorsal surface. Atabulate. Archaeopyle fairly large, trapezoidal, intercalary, located on dorsal epitheca. Opening of inner cyst semi-apical to apical.
Dimensions: Holotype: l=153 µm, b=83 µm, inner cyst 63x80 µm. Range (6 specimens): l=146(162)179 µm, b=72(85)99) µm.
Affinities:
Wilson, 1967, p.225: Deflandrea campbellensis
Deflandrea campbellensis has a somewhat similar shape to Deflandrea bakeri (Defl. and Cooks., 1955), but differs in overall size and in the prominence and structure of the transverse girdle.