Back
Rhombodinium coronatum
Rhombodinium "coronatum" Vozzhennikova, 1967, p.170–171, pl.89, figs.1–3,5; pl.90, figs.1–5.
NOW Dracodinium. Originally Rhombodinium, subsequently Wetzeliella,thirdly (and now) Dracodinium.
Taxonomic senior synonym: Wetzeliella articulata, according to Costa and Downie (1979, p.430) — however, Iakovleva and Heilmann-Clausen (2010, p. 211,226) retained Rhombodinium (as Wetzeliella) coronatum.
Holotype: Vozzhennikova, 1967, pl.89, fig.1; pl.90, fig.4; Lentin and Vozzhennikova, 1990, text-fig.43; lost according to Lentin and Vozzhennikova (1990, p.80).
Neotype: Iakovleva and Heilmann-Clausen, 2010, pl.12, fig.4, designated by Iakovleva and Heilmann-Clausen (2010, p.211).
Age: Ypresian.
Original description: Vozzhennikova, 1967, p.170-171
Theca pentagonal with well developed horns. Apical horn slightly attenuated, conical, broad or narrow sometimes tapering at the base. Lateral horns truncated at the end, with a clearly discernible transverse furrow. Antapical horns triangular, acutely pointed. Internal body large, oval or oval pentagonal, with a granular surface. Theca large, colored, richly provided with outgrowths of various shapes and sizes, simple, branched or bifurcate at the distal end. Similar outgrowths surround the transverse furrow, the lateral horns and occur on the sides of the theca and the antapical and apical horns. In this way the theca is richly ornamented. The outgrowths occur less frequently on the dorsal and ventral surfaces where they are irregularly distributed. Pylome circular to trapeziform or horseshoe-shaped. Size: Length 146 µm, width 121.5 µm; length of endocyst 92 µm, width 84 µm. Range, length 108-160 µm, width 105-145 µm; length of endocyst 72-118 µm, width 81-102 µm.
NOW Dracodinium. Originally Rhombodinium, subsequently Wetzeliella,thirdly (and now) Dracodinium.
Taxonomic senior synonym: Wetzeliella articulata, according to Costa and Downie (1979, p.430) — however, Iakovleva and Heilmann-Clausen (2010, p. 211,226) retained Rhombodinium (as Wetzeliella) coronatum.
Holotype: Vozzhennikova, 1967, pl.89, fig.1; pl.90, fig.4; Lentin and Vozzhennikova, 1990, text-fig.43; lost according to Lentin and Vozzhennikova (1990, p.80).
Neotype: Iakovleva and Heilmann-Clausen, 2010, pl.12, fig.4, designated by Iakovleva and Heilmann-Clausen (2010, p.211).
Age: Ypresian.
Original description: Vozzhennikova, 1967, p.170-171
Theca pentagonal with well developed horns. Apical horn slightly attenuated, conical, broad or narrow sometimes tapering at the base. Lateral horns truncated at the end, with a clearly discernible transverse furrow. Antapical horns triangular, acutely pointed. Internal body large, oval or oval pentagonal, with a granular surface. Theca large, colored, richly provided with outgrowths of various shapes and sizes, simple, branched or bifurcate at the distal end. Similar outgrowths surround the transverse furrow, the lateral horns and occur on the sides of the theca and the antapical and apical horns. In this way the theca is richly ornamented. The outgrowths occur less frequently on the dorsal and ventral surfaces where they are irregularly distributed. Pylome circular to trapeziform or horseshoe-shaped. Size: Length 146 µm, width 121.5 µm; length of endocyst 92 µm, width 84 µm. Range, length 108-160 µm, width 105-145 µm; length of endocyst 72-118 µm, width 81-102 µm.