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Phthanoperidinium levimurum
From Fensome et al., 2019:
Phthanoperidinium levimurum Bujak in Bujak et al., 1980, p.74, pl.19, figs.13–16; text-figs.20E,22B. Holotype: Bujak et al., 1980, pl.19, fig.13. Age: Middle Eocene (see Aubry, 1986).
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Paratype: Bujak in Bujak et al., 1980, pl.19, figs.14-16
Locus typicus: Barton, Hampshire, southern England
Stratum typicum: Late Eocene
Original diagnosis: Bujak in Bujak et al., 1980
Pericyst compressed dorsoventrally with an oval ambitus. One small conical apical horn and one or two unequal small antapical horns are present. An endocyst is rarely visible. The periphragm is granulate to sparsely verrucate with thin, smooth or undulating crests which delimit a paratabulation of 4', 3a, 7", xc, 5''', 2''''. Spines are absent from the crests. A deep, narrow, slightly helicoidal paracingulum is delimited by crests which may be finely denticulate. The archaeopyle is formed by the loss of paraplate 2a.
Dimensions. Pericyst length = 44-62 µm, breadth = 40-59 µm. Maximum crest height = 4-10 µm.
Phthanoperidinium levimurum Bujak in Bujak et al., 1980, p.74, pl.19, figs.13–16; text-figs.20E,22B. Holotype: Bujak et al., 1980, pl.19, fig.13. Age: Middle Eocene (see Aubry, 1986).
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Paratype: Bujak in Bujak et al., 1980, pl.19, figs.14-16
Locus typicus: Barton, Hampshire, southern England
Stratum typicum: Late Eocene
Original diagnosis: Bujak in Bujak et al., 1980
Pericyst compressed dorsoventrally with an oval ambitus. One small conical apical horn and one or two unequal small antapical horns are present. An endocyst is rarely visible. The periphragm is granulate to sparsely verrucate with thin, smooth or undulating crests which delimit a paratabulation of 4', 3a, 7", xc, 5''', 2''''. Spines are absent from the crests. A deep, narrow, slightly helicoidal paracingulum is delimited by crests which may be finely denticulate. The archaeopyle is formed by the loss of paraplate 2a.
Dimensions. Pericyst length = 44-62 µm, breadth = 40-59 µm. Maximum crest height = 4-10 µm.