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Phthanoperidinium powellii
Phthanoperidinium powellii Bujak, 1994
Holotype: Bujak, 1994, pl.4, fig.8
Paratypes: Bujak, 1994
Locus typicus: North Sea, UK16/26-2 well
Stratum typicum: section at 6280ft, Lutetian, Middle Eocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP
Phthanoperidinium powellii Bujak, 1994. Diagnosis from Bujak (1994, p.129-130): Endocyst compressed dorso-ventrally, with an oval ambitus and one small conical apical horn; antapical horns absent or very poorly developed. Endophragm relatively thick, ovoidal and chagrinate to granulate. Pericyst ovoidal, sometimes with a small, solid apical horn. Periphragm thin and smooth to chagrinate, separated from the endocyst by a wide pericoel. Paratabulation indistinct or absent, sometimes poorly delimited by extremely low and indistinct parasutural crests on the periphragm. Paracingulum circular to weakly helicoidal, delimited by low crests. Parasulcus narrow and poorly defined. Archeopyle typically formed by the loss of paraplate 2a, or by the loss of paraplates 1a to 3a on rare specimens. Size: pericyst length 56-65 µm, width 51-65 µm, endocyst length 43-51 µm, width 34-44 µm, maximum pericoel height 7.5-14 µm, apical horn length on endocyst 3-5 µm.
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Original diagnosis: Bujak, 1994, p.???
Endocyst compressed dorso-ventrally, with an oval ambitus and one small conical apical horn; antapical horns absent or very poorly developed. Endophragm relatively thick, ovoidal and chagrinate to granulate. Pericyst ovoidal, sometimes with a small, solid apical horn. Periphragm thin and smooth to chagrinate, separated from the endocyst by a wide pericoel. Paratabulation indistinct or absent, sometimes poorly delimited by extremely low and indistinct parasutural crests on the periphragm. Paracingulum circular to weakly helicoidal, delimited by low crests. Parasulcus narrow and poorly defined. Archeopyle typically formed by the loss of paraplate 2a, or by the loss of paraplates 1a to 3a on rare specimens.
Dimensions. Pericyst length 56-65 µm, breadth 51-65 µm, endocyst length 43-51 µm, breadth 34-44 µm, maximum pericoel height 7.5-14 µm, apical horn length on endocyst 3-5 µm.
Affinities:
Bujak, 1994, p.???: P. powelli is distinguished from all other species of Phthanoperidinium by the presence of a large pericoel.
Holotype: Bujak, 1994, pl.4, fig.8
Paratypes: Bujak, 1994
Locus typicus: North Sea, UK16/26-2 well
Stratum typicum: section at 6280ft, Lutetian, Middle Eocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP
Phthanoperidinium powellii Bujak, 1994. Diagnosis from Bujak (1994, p.129-130): Endocyst compressed dorso-ventrally, with an oval ambitus and one small conical apical horn; antapical horns absent or very poorly developed. Endophragm relatively thick, ovoidal and chagrinate to granulate. Pericyst ovoidal, sometimes with a small, solid apical horn. Periphragm thin and smooth to chagrinate, separated from the endocyst by a wide pericoel. Paratabulation indistinct or absent, sometimes poorly delimited by extremely low and indistinct parasutural crests on the periphragm. Paracingulum circular to weakly helicoidal, delimited by low crests. Parasulcus narrow and poorly defined. Archeopyle typically formed by the loss of paraplate 2a, or by the loss of paraplates 1a to 3a on rare specimens. Size: pericyst length 56-65 µm, width 51-65 µm, endocyst length 43-51 µm, width 34-44 µm, maximum pericoel height 7.5-14 µm, apical horn length on endocyst 3-5 µm.
--------------------------------------------------
Original diagnosis: Bujak, 1994, p.???
Endocyst compressed dorso-ventrally, with an oval ambitus and one small conical apical horn; antapical horns absent or very poorly developed. Endophragm relatively thick, ovoidal and chagrinate to granulate. Pericyst ovoidal, sometimes with a small, solid apical horn. Periphragm thin and smooth to chagrinate, separated from the endocyst by a wide pericoel. Paratabulation indistinct or absent, sometimes poorly delimited by extremely low and indistinct parasutural crests on the periphragm. Paracingulum circular to weakly helicoidal, delimited by low crests. Parasulcus narrow and poorly defined. Archeopyle typically formed by the loss of paraplate 2a, or by the loss of paraplates 1a to 3a on rare specimens.
Dimensions. Pericyst length 56-65 µm, breadth 51-65 µm, endocyst length 43-51 µm, breadth 34-44 µm, maximum pericoel height 7.5-14 µm, apical horn length on endocyst 3-5 µm.
Affinities:
Bujak, 1994, p.???: P. powelli is distinguished from all other species of Phthanoperidinium by the presence of a large pericoel.