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Phthanoperidinium multispinum
From Fensome et al., 2019:
Phthanoperidinium multispinum Bujak in Bujak et al., 1980, p.74, pl.19, figs.17–19; text-fig.20F. Holotype: Bujak et al., 1980, pl.19, fig.18. Age: Middle Eocene (see Aubry, 1986).
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Paratype: Bujak in Bujak et al., 1980
Locus typicus: Whitecliff Bay, Isle of Wight, S England
Stratum typicum: Late Eocene
Original description: Bujak in Bujak et al., 1980, p. 74
Diagnosis: Pericyst ovoidal with one apical and one or two unequal antapical horns. An endocyst is rarely visible. The periphragm is chagrinate to granulate, with low membranous crests which delimit a paratablutaion of 4', 3a, 7'', xc, 5''', 2''''. The crests bear closely spaced, solid, simple or bifurcate spines that are up to 6 µm long. Concentration of coarse granules on the periphragm may result in simulate rings within the paraplates. The archaeopyle is formed by the loss of paraplate 2a.
Dimensions: Pericyst length = 35-45 µm, breadth = 30-37 µm. Maximum crest height = 2-4 µm. Maximum spine height = 4-6 µm. 6 specimens measured.
Affinities:
Bujak in Bujak et al., 1980; P. multispinum is distinguished from P. alectrolophum Eaton, 1976, in having longer spines. However, they are not as long as in P. comatum.
Phthanoperidinium multispinum Bujak in Bujak et al., 1980, p.74, pl.19, figs.17–19; text-fig.20F. Holotype: Bujak et al., 1980, pl.19, fig.18. Age: Middle Eocene (see Aubry, 1986).
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Paratype: Bujak in Bujak et al., 1980
Locus typicus: Whitecliff Bay, Isle of Wight, S England
Stratum typicum: Late Eocene
Original description: Bujak in Bujak et al., 1980, p. 74
Diagnosis: Pericyst ovoidal with one apical and one or two unequal antapical horns. An endocyst is rarely visible. The periphragm is chagrinate to granulate, with low membranous crests which delimit a paratablutaion of 4', 3a, 7'', xc, 5''', 2''''. The crests bear closely spaced, solid, simple or bifurcate spines that are up to 6 µm long. Concentration of coarse granules on the periphragm may result in simulate rings within the paraplates. The archaeopyle is formed by the loss of paraplate 2a.
Dimensions: Pericyst length = 35-45 µm, breadth = 30-37 µm. Maximum crest height = 2-4 µm. Maximum spine height = 4-6 µm. 6 specimens measured.
Affinities:
Bujak in Bujak et al., 1980; P. multispinum is distinguished from P. alectrolophum Eaton, 1976, in having longer spines. However, they are not as long as in P. comatum.