From Williams et al., 2017:

[Trigonopyxis, Cookson and Eisenack, 1960a, p.11

Name illegitimate — senior homonym: Trigonopyxis Penard, 1912.

Type species: Trigonopyxis ginella, Cookson and Eisenack, 1960a (pl.3, fig.19)]

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Original description: [Cookson and Eisenack, 1960]:

Description:
Shell flat, triangular in outline, partially filled with a capsule.