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Phthanoperidinium geminatum
Phthanoperidinium geminatum Bujak in Bujak et al., 1980
Holotype: Bujak in Bujak et al. 1980, pl.19, figs.9-11
Paratype: Bujak in Bujak et al. 1980
Locus typicus: Alum Bay, Isle of Wight, southern England
Stratum typicum: Late Eocene
Original diagnosis: Bujak in Bujak et al., 1980, p. 72-73
Pericyst ovoidal with one small apical horn and one or two unequal antapical horns, the right always being strongly reduced. An endocyst is rarely visible. The periphragm is chagrinate to granulate with parasutural rows of granules, short spines, or low crests. These delimit a paratabulation of 4", 3a, 7", xc, 5""", 2"""". Simulate rows or zones of similar ornament are always present and lie 1µm to 3µm inside the parasutures, except for those bordering the paracingulum on the precingular and postcingular paraplates. These typically merge with the cingular parasutures. An archaeopyle is formed by the loss of paraplate 2a.
Dimensions. Pericyst length = 32-60 µm, breadth = 30-46 µm. Maximum ornament height = 1-4 µm.
Holotype: Bujak in Bujak et al. 1980, pl.19, figs.9-11
Paratype: Bujak in Bujak et al. 1980
Locus typicus: Alum Bay, Isle of Wight, southern England
Stratum typicum: Late Eocene
Original diagnosis: Bujak in Bujak et al., 1980, p. 72-73
Pericyst ovoidal with one small apical horn and one or two unequal antapical horns, the right always being strongly reduced. An endocyst is rarely visible. The periphragm is chagrinate to granulate with parasutural rows of granules, short spines, or low crests. These delimit a paratabulation of 4", 3a, 7", xc, 5""", 2"""". Simulate rows or zones of similar ornament are always present and lie 1µm to 3µm inside the parasutures, except for those bordering the paracingulum on the precingular and postcingular paraplates. These typically merge with the cingular parasutures. An archaeopyle is formed by the loss of paraplate 2a.
Dimensions. Pericyst length = 32-60 µm, breadth = 30-46 µm. Maximum ornament height = 1-4 µm.