ATAXIODINIUM Reid, 1974, p.588. Taxonomic senior synonym: Planinosphaeridium, by implication in Wall et al. (1977, p.149), who transferred the "type species" of Ataxiodinium, Ataxiodinium choane, to Planinosphaeridium - however, Edwards and Andrle (1992, p.265) retained Ataxiodinium. Type: Reid, 1974, pl.1, figs.1-2, as Ataxiodinium choane.
Parent: Subfamily Gonyaulacoideae