Leptodinium quadrangulum
From dinoflaj3
"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