Meiourogonyaulax bulloidea (Cookson and Eisenack, 1960b, p.247, pl.37, fig.11; text-figs.4a–b) Sarjeant, 1969, p.14. Emendation: Riding and Helby, 2001g, p.206, as Meiourogonyaulax bulloidea.

Originally Gonyaulax (motile stage), subsequently (and now) Meiourogonyaulax, thirdly Lithodinia. This species is here retained in Meiourogonyaulax following the retention of the genus by Riding and Helby (2001d, p.81,83). Backhouse (1988, p.95) considered Meiourogonyaulax stoveri to be the possible taxonomic senior synonym of this species.

Holotype: Cookson and Eisenack, 1960, pl.37, fig.11
Locus typicus: Canning Basin, Australia
Stratum typicum: Thitonian

Original description: Cookson and Eisenack, 1960, p.247: Gonyaulax bulloidea
Shell sphaerical, rather thick-walled, epitheca and hypotheca nearly equal, seperated by a rather broad, helicoidal girdle. Longitudinal furrow broadened towards the antapex. Plates mostly squarish or broadly trapezoid; plates 2" and 3" especially large, palte 1""" rather large, nearly rectangular. Formula 4", 6"", 6""", 1p, 1""". The girdle, longitudinal furrow, and paltes are bordered by low but well-developed ledges; both plates and ledges are ¦ granular, a feature which, when taken in conjuntion with the sphaerical shape and squarish plates, gives the shell a very characteristic appearance. The apex is marked by a small pointed projection. In all the examples observed, plate 3"", which in many species of Gonyaulax becomes detached to form the pylome, has always been in position. On the other ahnd, in some specimens the apical plates have been missing (?Ekdysis).
Dimensions: Holotype 78 µm long, 83 µm broad. Range 60-88x57-83 µm.