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Magallanesium balmei
Magallanesium balmei (Cookson and Eisenack, 1962b, p.486) Quattrocchio and Sarjeant, 2003, p.140. Emendation: Morgan, 1977, p.130, as Alterbia minor.
NOW Spinidinium balmei. Originally Deflandrea minor (name illegitimate), subsequently Deflandrea balmei, thirdly Alterbia balmei (combination illegitimate), fourthly Isabelidinium balmei, fifthly (and now) Spinidinium balmei, sixthly Magallanesium balmei.
Taxonomic senior synonym: Palaeohystrichophora (as Diconodinium) minuta, according to Morgan (1977, p.130) — however, Lentin and Williams (1981, p.156) retained Deflandrea (as Isabelidinium, now Spinidinium) balmei.
Holotype: Cookson and Eisenack, 1960a, pl.1, fig.1; Morgan, 1977, text-fig.2.
Age: Turonian-mid Senonian.
Original description: Cookson and Eisenack, 1960, p. 2: Deflandrea minor
Shell approximately oval, divided by a shallow but relatively broad girdle. The epitheca tapers to a short truncate or convex apex; the hypotheca is broadly rounded, with one or two small lateral points of unequal size. A rather broad longitudinal furrow is usually evident. The capsule is circular in outline and does not fill the shell laterally. The shell membrane is sparsely covered with small spines, which tend to be linearly arranged on the general surface as well as on the borders of the girdle and longitudinal furrow. The wall of the capsule is thin and smooth. The pylome is small and semicircular to trapezoid.
Dimensions: Holotype - 52 µm long; 40 µm broad; capsule 33 µm. Range - 45-65 µm long; 37-43 µm broad.
NOW Spinidinium balmei. Originally Deflandrea minor (name illegitimate), subsequently Deflandrea balmei, thirdly Alterbia balmei (combination illegitimate), fourthly Isabelidinium balmei, fifthly (and now) Spinidinium balmei, sixthly Magallanesium balmei.
Taxonomic senior synonym: Palaeohystrichophora (as Diconodinium) minuta, according to Morgan (1977, p.130) — however, Lentin and Williams (1981, p.156) retained Deflandrea (as Isabelidinium, now Spinidinium) balmei.
Holotype: Cookson and Eisenack, 1960a, pl.1, fig.1; Morgan, 1977, text-fig.2.
Age: Turonian-mid Senonian.
Original description: Cookson and Eisenack, 1960, p. 2: Deflandrea minor
Shell approximately oval, divided by a shallow but relatively broad girdle. The epitheca tapers to a short truncate or convex apex; the hypotheca is broadly rounded, with one or two small lateral points of unequal size. A rather broad longitudinal furrow is usually evident. The capsule is circular in outline and does not fill the shell laterally. The shell membrane is sparsely covered with small spines, which tend to be linearly arranged on the general surface as well as on the borders of the girdle and longitudinal furrow. The wall of the capsule is thin and smooth. The pylome is small and semicircular to trapezoid.
Dimensions: Holotype - 52 µm long; 40 µm broad; capsule 33 µm. Range - 45-65 µm long; 37-43 µm broad.