Shandongidium helmithoideum
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helmithoideum Xu Jinli et al., 1997, p.56-57, pl.5, figs.6-7 ex He Chengquan et al., 2009, p.364-365,664. Holotype: Xu Jinli et al., 1997, pl.5, fig.6. 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.664) validated the name by publishing an English diagnosis. Age: Mid-Late Eocene.
Parent: Shandongidium