Songiella crassa Xu Jinli et al., 1997, p.59; pl.2, figs.8,9a–b ex He Chengquan et al., 2009, p.367,666. Holotype: Xu Jinli et al., 1997, pl.2, fig.8. This name was not validly published in Xu Jinli et al. (1997), since no English or Latin description was provided; He Chengquan et al. (2009, p.666) validated the name by publishing an English diagnosis. Age: middle-late Eocene.