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Dubridinium caperatum
From Fensome et al., 2019:
Dubridinium caperatum Reid, 1977, p.451–452, pl.4, figs.38–41,44. Holotype: Reid, 1977, pl.4, figs.38–40. Motile equivalent: Preperidinium meunieri (Pavillard, 1912) Elbrächter, 1993, according to Reid (1977, p.451), who used the name Diplopeltopsis minor (Paulsen, 1907) Pavillard, 1913, now considered a taxonomic junior synonym of Preperidinium meunieri (see Head, 1996b, p.1211). Age: Holocene.
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Original diagnosis: Reid, 1977, p.451
Cavate cysts, circular to semi-circular in outline with pronounced polar compression and slight dorsoventral compression. Inner body thick walled (1-2 Ám), microgranulate. Periphragm thin, closely attached, sometimes showing indications of tabulation in the form of ridges delimiting the girdle and ventral sulcus.
Dimensions: Holotype: Test 50 µm. Range: Test 40x42-51x56 µm. Number of specimens measured 15.
Original description: Reid, 1977, p.451
Test oblate in ambital view, circular to sub-circular in other positions and with slight dorsoventral compression. The epitract and hypotract are of equal size. The inner body and periphragm are yellow brown and pale brown in colour respectively. Raised folds in the outer membrane delineate the girdle which is excavated, circular and not displaced. In the ventral area it trends or converges posteriorly into the ventral sulcus. The ventral sulcus is delimited by low ridges and visible only on the hypotract. Archeopyle epitractal. The epitract remains attached ventrally and to a varying extent laterally gaping open in lateral view.
Affinities:
Reid, 1977, p.542: This species of Dubridinium differs from other species in its thick walled microgranular inner capsule and its closely attached periphragm.
Dubridinium caperatum Reid, 1977, p.451–452, pl.4, figs.38–41,44. Holotype: Reid, 1977, pl.4, figs.38–40. Motile equivalent: Preperidinium meunieri (Pavillard, 1912) Elbrächter, 1993, according to Reid (1977, p.451), who used the name Diplopeltopsis minor (Paulsen, 1907) Pavillard, 1913, now considered a taxonomic junior synonym of Preperidinium meunieri (see Head, 1996b, p.1211). Age: Holocene.
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Original diagnosis: Reid, 1977, p.451
Cavate cysts, circular to semi-circular in outline with pronounced polar compression and slight dorsoventral compression. Inner body thick walled (1-2 Ám), microgranulate. Periphragm thin, closely attached, sometimes showing indications of tabulation in the form of ridges delimiting the girdle and ventral sulcus.
Dimensions: Holotype: Test 50 µm. Range: Test 40x42-51x56 µm. Number of specimens measured 15.
Original description: Reid, 1977, p.451
Test oblate in ambital view, circular to sub-circular in other positions and with slight dorsoventral compression. The epitract and hypotract are of equal size. The inner body and periphragm are yellow brown and pale brown in colour respectively. Raised folds in the outer membrane delineate the girdle which is excavated, circular and not displaced. In the ventral area it trends or converges posteriorly into the ventral sulcus. The ventral sulcus is delimited by low ridges and visible only on the hypotract. Archeopyle epitractal. The epitract remains attached ventrally and to a varying extent laterally gaping open in lateral view.
Affinities:
Reid, 1977, p.542: This species of Dubridinium differs from other species in its thick walled microgranular inner capsule and its closely attached periphragm.