From Fensome et al., 2019:
Hystrichodinium? infundibulum Jain et al., 1975, p.11–12, pl.3, fig.35. Holotype: Jain et al., 1975, pl.3, fig.35. Originally Hystrichodinium, subsequently (and now) Hystrichodinium?. Questionable assignment: Stover and Evitt (1978, p.162). NIA. Age: Maastrichtian.

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Locus typicus: Assam, India
Stratum typicum: Maastrichtian

Original diagnosis: Jain, Sah and Singh, 1975, p.11
Cyst ovoidal, girdle indistinct to sometimes distinct, epi- and hypotheca ¦ equal in size, with rounded apex; surface ornamented with hollow processes, mostly arranged at poles and long transverse girdle margin. Apical processes conical, blunt or bifid; antapical processes infundibular with recurved or blunt terminations. Surface of processes granular. Archaeopyle precingular; tabulation indistinct.

Dimensions:
Holotype; Range
Shell size (excluding processes) 440x50 µm; 40-50x50-65 µm
Length of processes14-20 µm; 14-20 µm
Width of cingulum4-6 µm; 4-6 µm