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Ceratiopsis sibirica
Ceratiopsis sibirica, (Vozzhennikova, 1963), Lentin and Williams, 1977
Combination illegitimate since the generic name Ceratiopsis is illegitimate.
Now Cerodinium. Originally (and now) Cerodinium, subsequently Ceratiopsis (combination illegitimate), thirdly Deflandrea.
Stover and Evitt, 1978, retained this species in Deflandrea Eisenack, 1938. Lentin and Williams, 1981, retained it in Ceratiopsis.
Lentin and Vozzhennikova, 1990, emended the diagnosis of this species, as Cerodinium sibiricum.
Holotype: Vozzhennikova, 1963, text-fig.9; Lentin and Vozzhennikova, 1990, pl.4, figs.1-2
Locus typicus: Western Siberia (Uvat)
Stratum typicum: 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.
Combination illegitimate since the generic name Ceratiopsis is illegitimate.
Now Cerodinium. Originally (and now) Cerodinium, subsequently Ceratiopsis (combination illegitimate), thirdly Deflandrea.
Stover and Evitt, 1978, retained this species in Deflandrea Eisenack, 1938. Lentin and Williams, 1981, retained it in Ceratiopsis.
Lentin and Vozzhennikova, 1990, emended the diagnosis of this species, as Cerodinium sibiricum.
Holotype: Vozzhennikova, 1963, text-fig.9; Lentin and Vozzhennikova, 1990, pl.4, figs.1-2
Locus typicus: Western Siberia (Uvat)
Stratum typicum: Paleocene-Eocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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.