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Wilsonidium lineidentatum
From Fensome et al., 2019:
Wilsonidinium lineidentatum (Deflandre and Cookson, 1955, p.253–254, pl.5, fig.5; text-figs.17–18) Lentin and Williams, 1976, p.139.
Holotype: Deflandre and Cookson, 1955, pl.5, fig.5.
NOW Stichodinium? Originally Wetzeliella, subsequently Wilsonidium, thirdly (and now) Stichodinium?
Age: Eocene.
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Original diagnosis: Deflandre and Cookson, 1955, p.253: Wetzeliella lineidentata
Cell encysted, compressed, nearly quadrangular with a toothed margin. Epitheca imperfectly preserved, probably triangular, opening apparently quadrangular; hypotheca with 2 short unequal horns. Membranes of cyst thick, roughened. Cell membranes with lines of numerous short, blunt teeth, in surface view relatively widely spaced both equatorially and so as to delimit roughly polygonal areas analogous to the plates characterizing the Peridiniales. Dimensions: Overall length 118 µm, breadth 110 µm; cyst, length 84 µm, breadth 77 µm.
Affinities:
Deflandre and Cookson, 1955, p.253 (annotated): Wetzeliella lineidentata
This unique specimen, although incomplete, merits description because of its distinctness from all other known species of Wetzeliella. It is of special interest on account of the alignment of the small spines, as drawn in Figures 17 and 18, not only in the equatorial zone but so as to form a kind of tabulation, both dinoflagellate characters.
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999
Wilsonidium lineidentatum (Deflandre and Cookson, 1955) Lentin and Williams, 1976. From the diagnosis by Deflandre and Cookson (1955, p.253-254), this species has a serrated margin. Epicyst not preserved. Hypocyst has unequally developed antapical horns and short cingular horns, with indented cingulum. Endocyst circular, thick-walled, with ambital pericoel. Pericyst ornamented with numerous short tubercles or teeth, which delineate the paratabulation. One specimen described. Size: overall length 118 µm, breadth 110 µm , endocyst: length 84 µm, breadth 77 µm.
Wilsonidinium lineidentatum (Deflandre and Cookson, 1955, p.253–254, pl.5, fig.5; text-figs.17–18) Lentin and Williams, 1976, p.139.
Holotype: Deflandre and Cookson, 1955, pl.5, fig.5.
NOW Stichodinium? Originally Wetzeliella, subsequently Wilsonidium, thirdly (and now) Stichodinium?
Age: Eocene.
----------------------------------------------------------------------------------------------------
Original diagnosis: Deflandre and Cookson, 1955, p.253: Wetzeliella lineidentata
Cell encysted, compressed, nearly quadrangular with a toothed margin. Epitheca imperfectly preserved, probably triangular, opening apparently quadrangular; hypotheca with 2 short unequal horns. Membranes of cyst thick, roughened. Cell membranes with lines of numerous short, blunt teeth, in surface view relatively widely spaced both equatorially and so as to delimit roughly polygonal areas analogous to the plates characterizing the Peridiniales. Dimensions: Overall length 118 µm, breadth 110 µm; cyst, length 84 µm, breadth 77 µm.
Affinities:
Deflandre and Cookson, 1955, p.253 (annotated): Wetzeliella lineidentata
This unique specimen, although incomplete, merits description because of its distinctness from all other known species of Wetzeliella. It is of special interest on account of the alignment of the small spines, as drawn in Figures 17 and 18, not only in the equatorial zone but so as to form a kind of tabulation, both dinoflagellate characters.
----------------------------------------------------------------------------------------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999
Wilsonidium lineidentatum (Deflandre and Cookson, 1955) Lentin and Williams, 1976. From the diagnosis by Deflandre and Cookson (1955, p.253-254), this species has a serrated margin. Epicyst not preserved. Hypocyst has unequally developed antapical horns and short cingular horns, with indented cingulum. Endocyst circular, thick-walled, with ambital pericoel. Pericyst ornamented with numerous short tubercles or teeth, which delineate the paratabulation. One specimen described. Size: overall length 118 µm, breadth 110 µm , endocyst: length 84 µm, breadth 77 µm.