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Dingodinium albertii
Dingodinium? albertii Sarjeant, 1966
Tax. jr. synonym of Dingodinium cerviculum Cookson and Eisenack, 1958, according to Haskell, 1969, Habib, 1975, and Mehrotra and Sarjeant, 1984.
Duxbury, 1977, Davey, 1978, and Stover and Helby, 1987, retained Dingodinium? albertii as a separate species. Khowaja-Ateequzzaman et al., 1990, agreed with Haskell, 1969.
Sarjeant, 1966, questionably included this species in Dingodinium.
Holotype: Sarjeant, 1966, pl.21, fig.3
Paratype: Sarjeant, 1966
Locus typicus: Speeton Clay, West Heslerton, Yorkshire, England
Stratum typicum: Early Barremian
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 Ám, breadth 52 Ám, length of inner body 40 Ám, breadth 45 Ám. Paratype: overall length 57 Ám, breadth 48 Ám, length of inner body 37 Ám, breadth 39 Ám. Overall lengths 50-66 Ám, breadths 37.5-52 Ám.
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 Ám 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.
Tax. jr. synonym of Dingodinium cerviculum Cookson and Eisenack, 1958, according to Haskell, 1969, Habib, 1975, and Mehrotra and Sarjeant, 1984.
Duxbury, 1977, Davey, 1978, and Stover and Helby, 1987, retained Dingodinium? albertii as a separate species. Khowaja-Ateequzzaman et al., 1990, agreed with Haskell, 1969.
Sarjeant, 1966, questionably included this species in Dingodinium.
Holotype: Sarjeant, 1966, pl.21, fig.3
Paratype: Sarjeant, 1966
Locus typicus: Speeton Clay, West Heslerton, Yorkshire, England
Stratum typicum: Early Barremian
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 Ám, breadth 52 Ám, length of inner body 40 Ám, breadth 45 Ám. Paratype: overall length 57 Ám, breadth 48 Ám, length of inner body 37 Ám, breadth 39 Ám. Overall lengths 50-66 Ám, breadths 37.5-52 Ám.
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 Ám 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.