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Deflandrea macmurdoensis
Deflandrea macmurdoensis (Wilson, 1967a, p.60–62, figs.11–16,22; text-fig.2a) Lentin and Williams, 1976, p.64.
NOW Spinidinium. Originally Deflandrea, subsequently (and now) Spinidinium, thirdly Magallanesium.
Holotype: Wilson, 1967, figs.11-13
Locus typicus: Erratics on Black Island, McMurdo Sound, Antarctica
Stratum typicum: Early Tertiary
Original description: Wilson, 1967, p.60, 62
Test bi-layered, dorso-ventrally flattened, angular, bilaterally asymetric. Outer cyst divided into fields by small spines (l=5-9 µm); smooth hyaline inner cyst clasely follows outline of outer cyst. Horns formed by polar extensions of outer cyst; apical horn relatively long (l=14-20 µm) narrow, blunt-ended and bordered by very small spines; right antapical horn either non-exsistent or very small. Prominent slightly laevo-rotary transverse girdle delimited by a double row of spines or sometimes, on the dorsal surface, by a spiny ridge. Archaeopyle intercalary, hoof-shaped or subhexagonal, located on dorsal epitheca; operculum always fixedto shell by its posterior margin; remainders of archaeopyle perimeter bordered by a double row of spines, one on operculum, the other on outer cyst, with line of rupture between the two rows. Tabulation uncertain, but that of dorsal epitheca apparently consistent with Gonyaulax.
Dimensions: Holotype: l=99 µm, b=72µ, inner cyst 72x63 µm. Range: l=61(87)99 µm, b=58(67)80 µm (10 specimens)
NOW Spinidinium. Originally Deflandrea, subsequently (and now) Spinidinium, thirdly Magallanesium.
Holotype: Wilson, 1967, figs.11-13
Locus typicus: Erratics on Black Island, McMurdo Sound, Antarctica
Stratum typicum: Early Tertiary
Original description: Wilson, 1967, p.60, 62
Test bi-layered, dorso-ventrally flattened, angular, bilaterally asymetric. Outer cyst divided into fields by small spines (l=5-9 µm); smooth hyaline inner cyst clasely follows outline of outer cyst. Horns formed by polar extensions of outer cyst; apical horn relatively long (l=14-20 µm) narrow, blunt-ended and bordered by very small spines; right antapical horn either non-exsistent or very small. Prominent slightly laevo-rotary transverse girdle delimited by a double row of spines or sometimes, on the dorsal surface, by a spiny ridge. Archaeopyle intercalary, hoof-shaped or subhexagonal, located on dorsal epitheca; operculum always fixedto shell by its posterior margin; remainders of archaeopyle perimeter bordered by a double row of spines, one on operculum, the other on outer cyst, with line of rupture between the two rows. Tabulation uncertain, but that of dorsal epitheca apparently consistent with Gonyaulax.
Dimensions: Holotype: l=99 µm, b=72µ, inner cyst 72x63 µm. Range: l=61(87)99 µm, b=58(67)80 µm (10 specimens)