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Cerodinium sibiricum
From Fensome et al., 2019:
Cerodinium sibiricum Vozzhennikova, 1963, p.181, text-figs.9–10. Emendation: Lentin and Vozzhennikova, 1990, p.39–40, as Cerodinium sibiricum. Holotype: Vozzhennikova, 1963, text-fig.9; Lentin and Vozzhennikova, 1990, pl.4, figs.1–2. Originally (and now) Cerodinium, subsequently Ceratiopsis (combination illegitimate), thirdly Deflandrea. Age: Paleocene–Eocene.
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Original description: [Vozzhennikova, 1963, p. 181]: (Translation: Lentin and Vozzhennikova, 1990):
Description:
Cells spherical or lentiform, with one apical and two widely spaced antapical horns. Girdle annular; longitudinal furrow situated on hypovalve. Width of furrow varies. Membrane thin, delicate, smooth, hyaline. Internal body occupies the whole cell cavity, its color being darker than that of the membrane.
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Emended description:
Lentin and Vozzhennikova, 1990, p. 39-40:
Description:
Cyst shape rounded peridinioid with one apical and two short, widely spaced antapical horns; endocyst broadly oval; cornucavate to circumcavate.
Periphragm thin with occasional delicate longitudinal wrinkles or folds; endophragm smooth or minutely granulose, both wall layers tend to show a dark brown color.
Paratabulation absent except as expressed by the archeopyle and paracingulum.
Archeopyle large standard hexa (iso-deltaform) formed by the loss of the 2a paraplate in both wall layers.
Paracingulum is shallow, indistinct to distinct, bordered by delicate spinules. The parasulcus is shallow and expressed only as a depression on the hypocyst. A crescent shaped opisthopyle may be present in the parasulcus.
Dimensions:
Holotype, length 95 µm, breadth 80 µm, length of apical horn 35 µm, length of antapical horns 15 µm, length of endocyst 69 µm, width 71 µm; range, length 70 - 142 µm, breadth 70 - 94.5 µm.
Cerodinium sibiricum Vozzhennikova, 1963, p.181, text-figs.9–10. Emendation: Lentin and Vozzhennikova, 1990, p.39–40, as Cerodinium sibiricum. Holotype: Vozzhennikova, 1963, text-fig.9; Lentin and Vozzhennikova, 1990, pl.4, figs.1–2. Originally (and now) Cerodinium, subsequently Ceratiopsis (combination illegitimate), thirdly Deflandrea. Age: Paleocene–Eocene.
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Original description: [Vozzhennikova, 1963, p. 181]: (Translation: Lentin and Vozzhennikova, 1990):
Description:
Cells spherical or lentiform, with one apical and two widely spaced antapical horns. Girdle annular; longitudinal furrow situated on hypovalve. Width of furrow varies. Membrane thin, delicate, smooth, hyaline. Internal body occupies the whole cell cavity, its color being darker than that of the membrane.
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Emended description:
Lentin and Vozzhennikova, 1990, p. 39-40:
Description:
Cyst shape rounded peridinioid with one apical and two short, widely spaced antapical horns; endocyst broadly oval; cornucavate to circumcavate.
Periphragm thin with occasional delicate longitudinal wrinkles or folds; endophragm smooth or minutely granulose, both wall layers tend to show a dark brown color.
Paratabulation absent except as expressed by the archeopyle and paracingulum.
Archeopyle large standard hexa (iso-deltaform) formed by the loss of the 2a paraplate in both wall layers.
Paracingulum is shallow, indistinct to distinct, bordered by delicate spinules. The parasulcus is shallow and expressed only as a depression on the hypocyst. A crescent shaped opisthopyle may be present in the parasulcus.
Dimensions:
Holotype, length 95 µm, breadth 80 µm, length of apical horn 35 µm, length of antapical horns 15 µm, length of endocyst 69 µm, width 71 µm; range, length 70 - 142 µm, breadth 70 - 94.5 µm.