From Williams et al., 2017:

[Indosphaera, Kumar, 1986b, p. 391

Type Species: Indosphaera bhujensis, Kumar, 1986b (pl.3, fig.5)]

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Original description: [Kumar, 1986]:

Diagnosis:
Cyst proximate, elongate, pentagonal, ovoidal or subsphaerical in outline.
Paratabulation features are essentially lacking, but sometimes faintly marked, irregular and small ridges develop on the autophragm indicating the presence of a paracingulum. No evidence of archaeopyle present. A prominent apical horn is always present, and two short antapical protrusions may or may not be present.

Affinities:
Indosphaera differs from Subtilisphaera, Geiselodinium and Tanaridinium in being proximate rather than cavate. It also differs from Saeptodinium in not having a discernible archaeopyle rather than having a well developed combination type archaeopyle.