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Parvocysta nasuta ssp. nasuta
Parvocysta nasuta ssp. nasuta; Emendation: Below, 1987a, p.139, as Reutlingia nasuta.
Autonym.
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.
Affinities: Bjµrke, 1980, p. 66: 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.
Autonym.
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.
Affinities: Bjµrke, 1980, p. 66: 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.