From Fensome et al., 2019:
Canningia hirtella (Alberti, 1961, p.28, pl.4, fig.20) Millioud, 1969, p.425. Holotype: Alberti, 1961, pl.4, fig.20.
NOW Circulodinium.
Taxonomic senior synonym: Cyclonephelium distinctum, according to Fensome et al. (2016b, p.39).
Originally and fourthly Circulodinium, subsequently Canningia, thirdly Cyclonephelium
This combination was not validly published in Eisenack (1964, p.322) since the basionym was not cited.
Age: Valanginian–Hauterivian.

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Original description as Circulodinium hirtella: [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.