Hystrichosphaeridium calospinum
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calospinum He Chengquan, Zhu Shenzhao and Jin Guangxian in He Chengquan et al., 1989, p.47-48, pl.20, fig.15. Holotype: He Chengquan et al., 1989, pl.20, fig.15. Mao Shaozhi et al. (1995, p.99) indicated that this name should be restricted to the holotype. Age: Early Tertiary.
Parent: Hystrichosphaeridium