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Spinidinium rotundum
Spinidinium rotundum Wilson, 1967
Now Vozzhennikovia. Originally Spinidinium, subsequently (and now) Vozzhennikovia, thirdly Dioxya.
Holotype: Wilson, 1967, fig.6
Locus typicus: Erratics on Black Island, McMurdo Sound, Antarctica
Stratum typicum: Eocene
Original diagnosis: Wilson, 1967, p.64
Shell circular or near-circular, single-layered; surface covered with numerous smali spines. Apical horn relatively large (L = 8-11 µm) rectangular; right antapical horn small, Pointed (L = 4-5 µm); left antapical horn absent. Transverse girdle faintly defined by a double row of spine-bearing ridges which are usually discontinuous. Wide longitudinal furrow. Intercalary archeopyle wide, hexagonal, located on dorsal epitheca; operculum free. Atabulate.
Dimensions: Holotype: L=65 µm, b=58 µm. Range: L=55(66)72 µm, b=47(52)58 µm.
Now Vozzhennikovia. Originally Spinidinium, subsequently (and now) Vozzhennikovia, thirdly Dioxya.
Holotype: Wilson, 1967, fig.6
Locus typicus: Erratics on Black Island, McMurdo Sound, Antarctica
Stratum typicum: Eocene
Original diagnosis: Wilson, 1967, p.64
Shell circular or near-circular, single-layered; surface covered with numerous smali spines. Apical horn relatively large (L = 8-11 µm) rectangular; right antapical horn small, Pointed (L = 4-5 µm); left antapical horn absent. Transverse girdle faintly defined by a double row of spine-bearing ridges which are usually discontinuous. Wide longitudinal furrow. Intercalary archeopyle wide, hexagonal, located on dorsal epitheca; operculum free. Atabulate.
Dimensions: Holotype: L=65 µm, b=58 µm. Range: L=55(66)72 µm, b=47(52)58 µm.