Palaeostomocystis expolita Brideaux, 1977

Now Fromea. Originally Palaeostomocystis, subsequently (and now) Fromea.
Holotype: Brideaux, 1977, pl.7, figs.12-14
Locus typicus: Richardson Mountains, District of Mackenzie, Canada
Stratum typicum: Barremian

Original diagnosis: Brideaux, 1977, p. 20
Shape: Autocyst length equal to or greater than maximum width; pear-shaped to trianguloid outline; autocyst narrowest apically, the sides straight or slightly convex, widening abruptly at about two thirds of the total length; straight or slightly invaginated in the median antapical part; lower third of the autocyst bilobed or at least expanded, the corners rounded; well-developed lobations commonly
compressed and folded, rarely extended. Dorso-ventral compression.
Phragma: Autophragm from 1.0-1.5 Ám thick; smooth or faintly scabrate.
Paratabulation: Evidence for determinable paratabulation lacking, the subangular outline of the apical archeopyle on many specimens indicating presence of apical paratabulation.
Archeopyle/operculum: Archeopyle apical, formed by the loss of a subcircular to subangular part of the apex, the archeopyle opening indistinctly to recognizably angular. Operculum flat, subrounded; generally detached, but occasionally in place (holotype) or lying in the autocoel. Formula A.
Pericingulum/perisulcus: Not observed.

Affinities:
Brideaux, 1977, p. 20: Palaeostomocystis expolita differs from Palaeostomocystis triquetra in possessing a smooth or scabrate autophragm, and from other published species of the genus in its shape Horologinella sp. indet. of Cookson and
Eisenack, 1962, possesses apiculate sculpture and is smaller. Other remarks made in the comparison section under Palaeostomocystis triquetra also apply here in
part.