From Fensome et al., 2019:
Circulodinium indicum Mehrotra and Sarjeant, 1987, p.163, pl.2, fig.2; pl.7, fig.1 ex Lentin and Williams, 1989, p.63. Holotype: Mehrotra and Sarjeant, 1987, pl.2, fig.2; Fensome et al., 2019a, fig.20A. Originally Cyclonephelium (name illegitimate), subsequently Circulodinium, thirdly Circulodinium?. Questionable assignment: Fauconnier and Londeix in Fauconnier and Masure (2004, p.116). Taxonomic senior synonym: Cleistosphaeridium diversispinosum, according to Fensome et al. (2019a, p.54). The name Cyclonephelium indicum was illegitimate in Mehrotra and Sarjeant (1987) since that name is preoccupied. By "transferring" the species to Circulodinium, Lentin and Williams (1989) effectively created a "new name". Age: Paleocene.

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Original description as Cyclonephelium indicum: [Mehrota and Sarjeant, 1987, p.163]:

Diagnosis:
Cyst proximochorate, skolochorate and cryptotabulate. Central body lenticular. Antapical pole asymmetrically placed, with sometimes a slight concavity alongside.
Autophragm thin and laevigate, covered with numerous (usually exceeding 100) short, slender and hollow processes, open distally; the distal extremities are usually entire, sometimes expanded and with a serrate margin and are unlinked. Processes are much fewer and shorter on the mid-dorsal and midventral areas than at the margins.
Archaeopyle apical (type tA), archaeopyle margin zigzag; an offset notch is the only indication of the sulcus.

Dimensions:
Holotype: length of cyst (apex lacking) 55 µm, breadth 65 µm, length of processes 6-10 µm.
Range: length of cyst (apex lacking) 38-57 µm, breadth 46-67 µm, process length 5-10 µm (average 8-9 µm). Ten specimens measured.