Reutlingia nasuta (Bjaerke, 1980, p.65–66, pl.1, figs.11–12; text-fig.3A) Below, 1987a, p.139. Emendation: Below, 1987a, p.139, as Reutlingia nasuta.

Now Parvocysta. Originally (and now) Parvocysta, subsequently Reutlingia. Lentin and Williams, 1989 retained this species in Parvocysta Bjµrke, 1980.

Holotype: Bjµrke, 1980, pl.1, figs.11,12
Locus typicus: Knorringfjellet, Spitsbergen
Stratum typicum: Toarcian

Original diagnosis: Bjµrke, 1980, p. 65: Parvocysta nasuta
Dinoflagellate cysts of the genus Parvocysta with an elongated pentagonal outline. Epicyst narrowing into a prominent blunt apical horn, antapical area slightly concave to convex. Cyst wall smooth. Paracingulum indicated by a shallow to relatively deep constriction separating the cyst into an elongated epicyst and a short hypocyst.
Size: 31-43 µm long, 20-28 µm wide.

Original description: Bjµrke, 1980, p. 66: Parvocysta nasuta
Small dinoflagellate cysts with an elongated pentagonal outline. Epicyst narrowing into a prominent apical horn, antapical area slightly concave to convex. Cyst wall single layered, smooth. Longitudinal folds common. Paratabulation except for archeopyle not observed. Archeopyle intercalary, outline hexagonal with posterior and anterior angulations (geniculate), formed by one mid-dorsal intercalary paraplate. Paracingulum indicated by a shallow to deep depression.

Bjµrke, 1980, p. 66: Parvocysta nasuta
P. nasuta is similar to P. bullula, P. contracta, and P. barbata but differs from these by the smooth surface and the prominent apical horn.