Songiella leptocaulis Xu Jinli et al., 1997, p.61, pl.2, figs.6a–b; pl.3, figs.10–11,14; pl.49, figs.2a–b ex He Chengquan et al., 2009, p.369–370,669. Holotype: Xu Jinli et al., 1997, pl.2, figs.6a–b. 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.669) validated the name by publishing an English diagnosis. Age: middle-late Eocene.