From Williams et al., 2017:

[Deunffia, Downie, 1960, p. 198; emend. Thusu, 1973, p. 806–807
Acritarch genus.

Type species: Deunffia monospinosa, (Deunff, 1951), Downie, 1960 (pl.1, fig.8)]

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Original description: [Downie, 1960, p. 198]:

Genotype: Deunffia monospinosa Downie, new species.

Definition: Shell hollow, elongate ellipsoidal, more or less smooth, less than 100μ in length. Body composed of thin, pale yellow to brown, organic membrane. Ornament consisting of a single hollow spine situated at one end. Spine terminates in a point or branches in various ways.

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Emended description: [Thusu, 1973a, p. 806-807]:

The above-mentioned diagnosis is emended to include:
1. Ornament consisting of one or two hollow processes situated at opposite ends. The long process terminates in a point or branches in various ways, other process is short and terminates in a point and does not exceed more than a few microns.
2. The 100μ length limit is removed to include larger forms.