Impletosphaeridium "nenjiangense" (Gao Ruiqi et al., 1992a, p.18,24, pl.3, figs.1-9; pl.4, figs.1-7) Williams et al., 1998, p.333. Holotype: Gao Ruiqi et al., 1992a, pl.3, fig.1. Originally Cleistosphaeridium, subsequently Impletosphaeridium, thirdly Spicadinium (Appendix A). Taxonomic senior synonym: Spicadinium akidoton (Appendix A), according to Mao Shaozhi et al. (1999, p.159). Age: Campanian.