Hystrichosphaeridium calospinum He Chengquan, Zhu Shenzhao and Jin Guangxian in He Chengquan et al., 1989

Mao Shaozhi et al. (1995, p.99) indicated that this name should be restricted to the holotype.
Holotype: He Chengquan et al., 1989, pl.20, fig.15
Age: Early Tertiary