Quantouendinium symmetricum (He Chengquan et al., 1992, p.186–187,193, pl.2, figs.4–6) He Chengquan et al., 2009, p.306. Holotype: He Chengquan et al., 1992, pl.2, fig.4; Gao Ruiqi et al., 1992b, pl.2, fig.5. Taxonomic senior synonym: Nyktericysta (now Quantouendinium) microreticulata, according to Mao Shaozhi et al. (1999, p.157); however, He Chengquan et al. (2009, p.306) retained this species as Quantouendinium symmetricum. Originally Nyktericysta, subsequently (and now) Quantouendinium. Age: Albian.