From Fensome et al., 2019:
Homotryblium tenuispinosum subsp. variabile (Yu Jingxian, 1989, p.143–144, pl.47, figs.11,14) Williams et al. 1998, p.269. Holotype: Yu Jingxian, 1989, pl.47, fig.11. Originally Homotryblium pallidum subsp. variabile, subsequently (and now) Homotryblium tenuispinosum subsp. variabile. Age: Pleistocene.

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