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Phthanoperidinium distinctum
Phthanoperidinium distinctum Bujak, 1994
Holotype: Bujak, 1994, pl.5, fig.7
Paratypes: Bujak, 1994
Locus typicus: North Sea, UK16/16b-4 well
Stratum typicum: section at 5624ft, 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 distinctum Bujak, 1994. Diagnosis from Bujak (1994, p.129). Pericyst subpolygonal peridinioid, with a small but distinct apical horn, without antapical horns, or with a poorly developed left antapical horn. Endocyst ovoidal, thin and often corroded, sometimes absent due to preservation, exhibiting birefringence under phase contrast illumination. Periphragm thin and chagrinate, forming low but thick and robust parasutural crests that are distally smooth and delimit a paratabulation of 4', 3a, 7", 6c, 5"’, 2"”. Penitabular areas of the periphragm between the parasutural crests may be absent due to corrosion. Archeopyle formed by the loss of paraplate 2a. Size: pericyst length 37-50 µm, width 38-46 µm, apical horn less than 2 µm.
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Original diagnosis: Bujak, 1994,
Pericyst subpolygonal peridinioid, with a small but distinct apical horn, without antapical horns or with a poorly developed left antapical horn. Endocyst ovoidal, thin and often corroded, sometimes absent due to preservation, exhibiting birefringence under phase contrast illumination. Periphragm thin and chagrinate, forming low but thick and robust parasutural crests that are distally smooth and delimit a paratabulation of 4', 3a, 7", 6c, 5''', 2''''. Penitabular areas of the periphragm between the parasutural crests may be absent due to corrosion. Archeopyle formed by the loss of paraplate 2a.
Dimensions. Pericyst length 37-50 µm, breadth 38-46 µm, apical horn length less than 2 µm.
Affinities:
Bujak, 1994, p.???: P. distinctum is characterized by its peridinioid shape, thin birefringent endocyst that may be corroded or absent, and the low but robust smooth parasutural crests. The periphragm between the crests is thin and may be absent, so that all that remains of the cyst in these extreme cases is a paratabular network of crests.
Holotype: Bujak, 1994, pl.5, fig.7
Paratypes: Bujak, 1994
Locus typicus: North Sea, UK16/16b-4 well
Stratum typicum: section at 5624ft, Lutetian, Middle Eocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP
Phthanoperidinium distinctum Bujak, 1994. Diagnosis from Bujak (1994, p.129). Pericyst subpolygonal peridinioid, with a small but distinct apical horn, without antapical horns, or with a poorly developed left antapical horn. Endocyst ovoidal, thin and often corroded, sometimes absent due to preservation, exhibiting birefringence under phase contrast illumination. Periphragm thin and chagrinate, forming low but thick and robust parasutural crests that are distally smooth and delimit a paratabulation of 4', 3a, 7", 6c, 5"’, 2"”. Penitabular areas of the periphragm between the parasutural crests may be absent due to corrosion. Archeopyle formed by the loss of paraplate 2a. Size: pericyst length 37-50 µm, width 38-46 µm, apical horn less than 2 µm.
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Original diagnosis: Bujak, 1994,
Pericyst subpolygonal peridinioid, with a small but distinct apical horn, without antapical horns or with a poorly developed left antapical horn. Endocyst ovoidal, thin and often corroded, sometimes absent due to preservation, exhibiting birefringence under phase contrast illumination. Periphragm thin and chagrinate, forming low but thick and robust parasutural crests that are distally smooth and delimit a paratabulation of 4', 3a, 7", 6c, 5''', 2''''. Penitabular areas of the periphragm between the parasutural crests may be absent due to corrosion. Archeopyle formed by the loss of paraplate 2a.
Dimensions. Pericyst length 37-50 µm, breadth 38-46 µm, apical horn length less than 2 µm.
Affinities:
Bujak, 1994, p.???: P. distinctum is characterized by its peridinioid shape, thin birefringent endocyst that may be corroded or absent, and the low but robust smooth parasutural crests. The periphragm between the crests is thin and may be absent, so that all that remains of the cyst in these extreme cases is a paratabular network of crests.