Gonyaulax helicoidea Eisenack and Cookson 1960; Emendations: Sarjeant, 1966b, p.116, as Gonyaulacysta helicoidea; Helenes and Lucas-Clark, 1997, p.187-188, as Wrevittia helicoidea.

NOW Wrevittia. Originally Gonyaulax, subsequently Gonyaulacysta, thirdly (and now) Wrevittia.
Taxonomic junior synonym: Gonyaulacysta (now Wrevittia?) diutina, according to Stover and Helby (1987d, p.287) - however, Jan du Chêne et al. (1986a, p.131) and Lentin and Williams (1989, p.152) retained Gonyaulacysta (now Wrevittia?) diutina.

Holotype: Eisenack and Cookson, 1960, pl.1, fig.4; Jan du Chêne et al., 1986, pl.40, figs.4-5
Locus typicus: N. Queensland, Australia
Stratum typicum: Neocomian-Aptian

Original description: Eisenackand Cookson, 1960, p.2
Shell broadly oval, unequally divided by a strongly helicoid girdle; epitheca longer than hypotheca, surmounded by a hollow, thin-walled conical projection with a blunt apex; hypotheca broadly rounded. Both the girdle and plates are bordered by relatively high ledges with serrate edges. The surface of the plates is ornamented to varying degrees with small irregularly scattered tubercles. The longitudinal furrow lies +/- obliquely to the long axis. A pylome may be developed by the removal of plate 3"".
Dimensions: Range: 62-86 Ám long, 48-67 Ám broad.