From Williams, Lentin and Fensome 1998 - Lentin and Williams Index of Fossil Dinoflagellates:

[Achomosphaera recurvata, Jain et al., 1975, p. 8, pl.3, figs.36-37,39.

Holotype: Jain et al., 1975, pl.3, fig.36]
Locus typicus: Assam, India
Age: Maastrichtian

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Original description: [Jain et al., 1975, p. 8]:

Description:
Cyst sphaerical to oblong, wall moderately thick, endophragm and periphragm in close contact, surface ornament perforate.
Processes thin, long, hollow, bases broad, in close contact with test wall layers, termination acuminate and recurved; sometimes processes branched.
Archaeopyle precingular.

Dimensions:
Holotype - 50x40 µm, range - 40-60x38-50 µm; length of processes 14 µm, range 12-20 µm.