Leptodinium quadrangulum
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"quadrangulum" Yu Jingxian, 1982, p.242, pl.4, figs.10,13,15. Holotype: Yu Jingxian, 1982, pl.4, fig.13. Taxonomic senior synonym: Leptodinium impenseum, according to He Chengquan et al. (2009, p.107). Age: Late Jurassic-Early Cretaceous.
Parent: Leptodinium