From Fensome et al., 2019:
Dichadogonyaulax culmula ssp. curtospina (Quattrocchio and Sarjeant, 1992, p.90 (al. 2–242), pl.6, figs.3,6) Lentin and Williams,
1993, p.178. Holotype: Quattrocchio and Sarjeant, 1992, pl.6, fig.6. Originally Dichadogonyaulax culmula var. curtospina, subsequently (and now) Dichadogonyaulax culmula subsp. curtospina. Age: middle–late Tithonian.

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