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Cerodinium albertii
Cerodinium albertii, (Corradini, 1973), Lentin and Williams, 1987
Originally Deflandrea, subsequently Senegalinium?, thirdly (and now) Cerodinium; see also Ceratiopsis (combination illegitimate).
Taxonomic junior synonym (at specific rank): Peridinium pedunculatum forma divaricans (subsequently Phelodinium tricuspe subsp. divaricans), according to Sarjeant (1985b, p.158) and Lentin and Williams (1993, p.504,511).
Holotype: Corradini, 1973, pl.27, figs.7a-b
Locus typicus: Viano, Reggio Emilia, Italy
Stratum typicum: Late Cretaceous-Paleocene
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Original description as Deflandrea albertii: [Corradini, 1973, p. 174-175]:
Diagnosis:
Dinoflagellate cyst subpentagonal in outline with smooth, thick-walled inner body and striate-punctated periphragm. One apical and two antapical horns, well developed. Inner capsule subcircular in outline pericoel antapical.
Cingulum well defined sulcus broad.
Archeopyle intercalary.
Dimensions:
Holotype: diameter of the inner body 80x75 µm, width of the cyst 95 µm, total length 190 µm, dimensions of the archeopyle 40x23 µm.
Range: diameter of the inner body 55-(64)-80 µm, width of the cyst 68-(80)-100 µm, total length 140-(160)-190 µm.
Description:
The test is flattened dorsoventrally, showing the periphragm with a subpentagonal outline. Epitractal sides usually convex, hypotractal ones straight or concave.
Apical and antapical horns tapering gradually from the bases to the apex, the former distally blunted, the latter normally acuminate. The length of the horns is approximately equal. The antapical horns are well separated, their axes being straight or slightly diverging.
The inner capsule, smooth or slightly granular, is closely appressed to the periphragm of the epitract, except at the horn. On the contrary a well-developed pericoel is usually present on the lower part of the hypotract and the inner body is not in contact with the lateral walls of the test.
The cingulum is well defined being delineated by two low, finely ondulose ridges, and is only slightly helicoidal. A wide, longitudinal furrow is normally observable, restricted to the hypotract. A sinuous impression, suggesting a poreflagellar mark, is sometimes present on the middle of the sulcus. The intercalary archeopyle is normally wide and polygonal in shape.
Originally Deflandrea, subsequently Senegalinium?, thirdly (and now) Cerodinium; see also Ceratiopsis (combination illegitimate).
Taxonomic junior synonym (at specific rank): Peridinium pedunculatum forma divaricans (subsequently Phelodinium tricuspe subsp. divaricans), according to Sarjeant (1985b, p.158) and Lentin and Williams (1993, p.504,511).
Holotype: Corradini, 1973, pl.27, figs.7a-b
Locus typicus: Viano, Reggio Emilia, Italy
Stratum typicum: Late Cretaceous-Paleocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Deflandrea albertii: [Corradini, 1973, p. 174-175]:
Diagnosis:
Dinoflagellate cyst subpentagonal in outline with smooth, thick-walled inner body and striate-punctated periphragm. One apical and two antapical horns, well developed. Inner capsule subcircular in outline pericoel antapical.
Cingulum well defined sulcus broad.
Archeopyle intercalary.
Dimensions:
Holotype: diameter of the inner body 80x75 µm, width of the cyst 95 µm, total length 190 µm, dimensions of the archeopyle 40x23 µm.
Range: diameter of the inner body 55-(64)-80 µm, width of the cyst 68-(80)-100 µm, total length 140-(160)-190 µm.
Description:
The test is flattened dorsoventrally, showing the periphragm with a subpentagonal outline. Epitractal sides usually convex, hypotractal ones straight or concave.
Apical and antapical horns tapering gradually from the bases to the apex, the former distally blunted, the latter normally acuminate. The length of the horns is approximately equal. The antapical horns are well separated, their axes being straight or slightly diverging.
The inner capsule, smooth or slightly granular, is closely appressed to the periphragm of the epitract, except at the horn. On the contrary a well-developed pericoel is usually present on the lower part of the hypotract and the inner body is not in contact with the lateral walls of the test.
The cingulum is well defined being delineated by two low, finely ondulose ridges, and is only slightly helicoidal. A wide, longitudinal furrow is normally observable, restricted to the hypotract. A sinuous impression, suggesting a poreflagellar mark, is sometimes present on the middle of the sulcus. The intercalary archeopyle is normally wide and polygonal in shape.