Back
Cerodinium sibiricum
Cerodinium sibiricum, Vozzhennikova, 1963; Emend. Lentin and Vozzhennikova, 1990, as Cerodinium sibiricum.
Originally (and now) Cerodinium, subsequently Deflandrea; see also Ceratiopsis (combination illegitimate).
Lentin and Williams, 1987, retained the genus Cerodinium and retained Cerodinium sibiricum as the type species.
Holotype: Vozzhennikova, 1963, text-fig.9; Lentin and Vozzhennikova, 1990, pl.4, figs.1-2
Locus typicus: Western Siberia (Uvat), Russia
Stratum typicum: Palaeocene-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.
Originally (and now) Cerodinium, subsequently Deflandrea; see also Ceratiopsis (combination illegitimate).
Lentin and Williams, 1987, retained the genus Cerodinium and retained Cerodinium sibiricum as the type species.
Holotype: Vozzhennikova, 1963, text-fig.9; Lentin and Vozzhennikova, 1990, pl.4, figs.1-2
Locus typicus: Western Siberia (Uvat), Russia
Stratum typicum: Palaeocene-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.