From Fensome et al., 2019:
Wallodinium bidigitatum (Manum and Cookson, 1964) Lentin and Williams, 1973
Originally Diplotesta, subsequently (and now) Wallodinium.
Holotype: Manum and Cookson, 1964, pl.5, fig.6
Locus typicus: Graham Island, Arctic Canada
Stratum typicum: Late Cretaceous

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Original diagnosis: Manum and Cookson, 1964, p.25: Diplotesta bidigitata
Shell roughly crescent-shaped in lateral view, apices blunt, usually elongate and more or less curled. Capsule asymmetrically biconvex or concavo-convex, prolonged at each end into a hollow, finger-like process. The walls of both shell and capsule are smooth. The shell opens by a break at one end.
Dimensions: Holotype: 65 µm long as measured from apex to apex, 32 µm across; capsule 57 x 31 µm. Paratype: shell 85 x 34 µm, capsule 56 x 28 µm.