From Fensome et al., 2019:
Trigonopyxidia ginella (Cookson and Eisenack, 1960a, p.11, pl.3, figs.18–20) Downie and Sarjeant, 1965, p.149.
Holotype: Cookson and Eisenack, 1960a, pl.3, fig.19; Fensome et al., 1996, fig.2 — p.2137.
Originally Trigonopyxis (generic name illegitimate), subsequently (and now) Trigonopyxidia.

Locus typicus: North of Gingin, Perth Basin, Western Australia
Stratum typicum: ?Upper Albian to Cenomanian

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Original description: Cookson and Eisenack, 1960, p. 11: Trigonopyxis ginella
Shell triangular, with straight to concave sides and rounded angles. Capsule almost circular to broadly triangular. Shell membrane and wall of capsule smooth.
Dimensions: Holotype: shell about 50 µm; capsule about 30 µm. Range: shell 50-66 µm; capsule 30-43 µm.