Bipolaribucina biornata
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"?biornata" He Chengquan, Zhu Shenzhao and Jin Guangxing in He Chengquan et al., 1989, p.39, pl.22, figs.18–19. Holotype: He Chengquan et al., 1989, pl.22, fig.18. NOW Songiella. Originally Bipolaribucina?, subsequently Distatodinium, thirdly (and now) Songiella. Questionable assignment: He Chengquan, Zhu Shenzhao and Jin Guangxing in He Chengquan et al. (1989, p.39). Taxonomic senior synonym: Membranilarnacia paucitubata, according to Mao Shaozhi et al. (1995, p.44) — however, He Chengquan et al. (2009, p.366) retained this species as Songiella biornata. Age: Early Tertiary.
Parent: Bipolaribucina