Lithodinia helbyi Morgan, 1980, p.26, pl.18, figs.4–7. Emendation: Stover and Helby, 1987d, p.265,267, as Cernicysta helbyi.

Now Cernicysta. Originally Lithodinia, subsequently (and now) Cernicysta.
Holotype: Morgan, 1980, pl.18, fig.4-6
Locus typicus: Wanaaring, New South Wales, Australia
Stratum typicum: Middle Aptian-Early Albian

Original description: Morgan, 1980, p. 26
Double-walled cysts have a subcircular to slightly elliptical ambitus, with moderately high (4-6 µm) parasutural crests; periphragm thin, often finely granulate; endophragm thicker and rigid, subspherical; wall layers closely appressed in intratabular areas and in the paracingulum, separated beneath inflated parasutural crests; inflation of parasutural crests greater around precingular and postcingular plates than along the paracingulum; crests often distorted or collapsed due to thin nature of periphragm, paratabulation gonyaulacean; paracingulum relatively broad (8-10 µm) relative to total cyst length (55-60 µm); archeopyle apical, operculum free.

Affinities:
Morgan, 1980, p. 26: The thin, easily folded periphragm, broad cingulum, and subcircular ambitus are not seen in other Lithodinia species.