From Fensome et al., 2019:
Ctenidodinium? thulium (Davies, 1983, p.19–20, pl.5, figs.1–8,10–12; text-fig.14) Jan du Chêne et al., 1986b, p.32. Holotype:
Davies, 1983, pl.5, figs.10–11. Originally Occisucysta, subsequently (and now) Ctenidodinium?. Questionable
assignment: Jan du Chêne et al. (1986b, p.32). Age: middle Callovian–Oxfordian.

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Original diagnosis: Davies, 1983, p. 19: Occisucysta thulia
A large oblate species of Occisucysta marked by denticulate crests and penitabular hair-like spines. Tabulation: "?4'. ?a, 6'', 6c, ?''',?''''. Archeopyle: P(3). Size: length- 83(89)94 µm; breadth - 80(92)112 µm.

Original description: Davies, 1983, p. 19: Occisucysta thulia
The hair-like spines (2-5 µm long) arise in penitabular bands around the periphery of the plates leaving the centre of the plates less ornamented. The sutural crests are 8 µm high. The cyst is usually polarly compressed and is oval in outline. When eventually compressed it has a rounded pentagonal outline with little or no apical horn development. It is often split epitractally.

Affinities:
Davies, 1983, p. 20: Occisucysta thulia
The large size, the denticulate crests and the hair like spines distinguish it from all other species of Occisucysta.