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Circulodinium hirtellum
From Fensome et al., 2019:
Circulodinium hirtellum Alberti, 1961, p.28–29, pl.4, fig.20. Holotype: Alberti, 1961, pl.4, fig.20. Taxonomic senior synonym: Cyclonephelium distinctum, according to Fensome et al., (2016b, p.39). Originally Circulodinium, subsequently Canningia, thirdly Cyclonephelium, fourthly Circulodinium. Helby (1987, p.322,324–325) retained this species in Circulodinium. Backhouse (1988, p.83) considered this species to be a possible taxonomic junior synonym of Tenua (as Cyclonephelium) hystrix. Age: Valanginian–Hauterivian.
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Original description: [Alberti, 1961, p.28] (Translation: LPP):
Diagnosis:
Shell flattened, outline irregularly rounded, slightly longer than broad. Short apical protrusion. Two antapical bulges of unequal size. Epitheca slightly smaller than hypotheca. Surface of shell, except central parts of dorsal and ventral sides, covered with short, pointed, thorn-like spines.
Description:
Short, blunt apical horn (c. 7 µm). Two rounded antapical horns of unequal size. The length and distribution of the at the bases broadened thorns variable. Membrane yellow-brown and transparent.
Dimensions:
Holotype - length 102 µm, breadth 93 µm, length of thorns 3-4 µm, length of apical horn 7 µm, antapical bulges 10-12 µm.
Range - length 98-106 µm, breadth 88-97 µm.
Circulodinium hirtellum Alberti, 1961, p.28–29, pl.4, fig.20. Holotype: Alberti, 1961, pl.4, fig.20. Taxonomic senior synonym: Cyclonephelium distinctum, according to Fensome et al., (2016b, p.39). Originally Circulodinium, subsequently Canningia, thirdly Cyclonephelium, fourthly Circulodinium. Helby (1987, p.322,324–325) retained this species in Circulodinium. Backhouse (1988, p.83) considered this species to be a possible taxonomic junior synonym of Tenua (as Cyclonephelium) hystrix. Age: Valanginian–Hauterivian.
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Original description: [Alberti, 1961, p.28] (Translation: LPP):
Diagnosis:
Shell flattened, outline irregularly rounded, slightly longer than broad. Short apical protrusion. Two antapical bulges of unequal size. Epitheca slightly smaller than hypotheca. Surface of shell, except central parts of dorsal and ventral sides, covered with short, pointed, thorn-like spines.
Description:
Short, blunt apical horn (c. 7 µm). Two rounded antapical horns of unequal size. The length and distribution of the at the bases broadened thorns variable. Membrane yellow-brown and transparent.
Dimensions:
Holotype - length 102 µm, breadth 93 µm, length of thorns 3-4 µm, length of apical horn 7 µm, antapical bulges 10-12 µm.
Range - length 98-106 µm, breadth 88-97 µm.