From Fensome et al., 2019:
Pyxidiella triangularis Yu Jingxian, 1982, p.257, pl.6, figs.14–16. Holotype: Yu Jingxian, 1982, pl.6, fig.15. Age: Late Jurassic–Early Cretaceous.

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Description: Cysts ovoid or broadly ovoid in outline. Periphragm only 1 µm thick. Surface with punctate ornamentation and secondary creases. Intercalary archeopyle. Outline quadrilateral.
Size: Cysts 20 - 26 µm long and 18 -20 µm wide.

Comparison: This new species is distinguished from other species in the genus by its large archeopyle, polygonal shape and small-sized individuals.