Palaeotetradinium "natans" (Cookson and Eisenack, 1962b, p.496, pl.7, figs.12–13) Lentin and Williams, 1985, p.272.

Holotype: Cookson and Eisenack, 1962b, pl.7, fig.13.
Combination not validly published: basionym not fully referenced.
Originally Rhombodella (Appendix A), subsequently Palaeotetradinium (combination not validly published).
Taxonomic senior synonym: Palaeohystrichophora (now Rhombodella) paucispina, according to Stover and Evitt (1978, p.71). Lentin and Williams (1985, p.272) inadvertently proposed this combination.
Age: Aptian–Albian.