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Dingodinium albertii

From Fensome et al., 2019:
Dingodinium? albertii Sarjeant, 1966c, p.210–211, pl.21, fig.3; pl.23, fig.1. Emendation: Pestchevitskaya, 2018, p.95,97. Holotype: Sarjeant, 1966c, pl.21, fig.3. Taxonomic senior synonym: Dingodinium cerviculum, according to Haskell (1970, p.60) and Khowaja-Ateequzzaman et al. (1990, p.274) — however, Pestchevitskaya (2018, p.95) retained the two species separately. Questionable assignment: Sarjeant (1966c, p.210); however, Duxbury (1977, p.29) retained this species in Dingodinium without question. Age: early Barremian.

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Original diagnosis: Sarjeant 1966, p. 210
A cavate dinoflagellate cyst with thin outer shell, irregularly ovoidal to subpolygonal in outline, drawn out into a blunt, stout apical horn; inner body thin, spheroidal, with dense cover of large, pointed tubercles. Outer shell possess clear helicoid cingulum marked by folds or ridges; further folds or ridges, less prominent, define tabulation. Intercalary archaeopyle apparently formed.
Dimensions: Holotype: over all length 66 µm, breadth 52 µm, length of inner body 40 µm, breadth 45 µm. Paratype: overall length 57 µm, breadth 48 µm, length of inner body 37 µm, breadth 39 µm. Overall lengths 50-66 µm, breadths 37.5-52 µm.

Original description: Sarjeant 1966, p. 210-211
The outer shell is basically ovoidal to polygonal; but it is extremely thin and is deformed in variable fashion in the seven specimens examined. It bears folds or ridges which simulate a tabulation and is drawn out into a short apical horn with a blunt, slightly rounded tip. The inner body is spheroidal and typically broader than long. The periphragm is smooth; the endophragm is smooth or very minutely granular. The latter bears a moderately dense cover of tubercles; these are conical and do not exceed 1 µm in height. There is some suggestion that the tubercles show a degree of alignment, but this could not be confirmed. The archaeopyle is situated on the upper flanks of the epitract, in a position corresponding to the intercalary archaeopyle described by Evitt (1961, text-fig. 7). The tabulation pattern was not sufficiently clear, however, to permit certainty as to whether the archaeopyle corresponded in position to an intercalary plate; it is equally possible to visualize formation by loss of the equivalent of the anterior part only of a precingular plate.

Affinities:
Sarjeant, 1966, p. 211
Dingodinium? albertii differs from all other described species in the realtive shapes of outer shell and inner body and in the ornamentation of the inner body.
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