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Phthanoperidinium amoenum
Phthaneropreidinium amoenum Drugg and Loeblich Jr., 1967
Holotype: Drugg and Loeblich Jr., 1967, pl.1, fig.4
Locus typicus: Vicksburg, Warren County, Mississippi
Stratum typicum: Oligocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Phthanoperidinium amoenum Drugg and Loeblich, Jr., 1967, emend. Edwards and Bebout, 1981. This species has a short apical horn (4-5 µm), with no horns at the antapex. Tabulation is 4', 3a, 7", 5c, 5"’,1a. pl, 1d pl, 1s pl 1ppl 2"”. Archeopyle type I. The sutures are low and finely and clearly denticulate. The wall varies from smooth to finely granulate to vermiculate. According to Islam (1982), similar forms lose all three anterior intercalary and three adjoining precingulars in archeopyle formation. Size: length 34-46 µm, width 33-43 µm.
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Original diagnosis: Drugg and Loeblich, 1967, p.182
Tract small, oval, neatly tabulated. A short horn, 4-5 µm long, is located at the apex of the tract. This small horn is probably related to the apical pore of the present day marine Peridinium. There are no horns at the antapex. A slightly helicoid cingulum is present midway between the apices. The tabulation is 4', 3a, 7'', 5c, 5''', 1a. pl., 1d-pl., 1s. pl., 1p. pl., 2''''. The archeopyle is formed by the loss of the six-sided intercalary plate 2a. The sulcal area contains one anterior platelet, a right and left median platelet, and a posterior ventral plate. The median platelet is usually weakly expressed or absent. A raised small dark area in the center of the sulcal area is presumably related to the flagellar fin of the motile stage. The large posterior ventral plate (p. pl.) entirely fills the lower part of the sulcus. The sutures are low and finely and clearly denticulate. The wall varies from smooth, to finely granulate, to vermiculate. Endophragm and periphragm not clearly differentiated, but both layers are seemingly thin.
Holotype: Drugg and Loeblich Jr., 1967, pl.1, fig.4
Locus typicus: Vicksburg, Warren County, Mississippi
Stratum typicum: Oligocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Phthanoperidinium amoenum Drugg and Loeblich, Jr., 1967, emend. Edwards and Bebout, 1981. This species has a short apical horn (4-5 µm), with no horns at the antapex. Tabulation is 4', 3a, 7", 5c, 5"’,1a. pl, 1d pl, 1s pl 1ppl 2"”. Archeopyle type I. The sutures are low and finely and clearly denticulate. The wall varies from smooth to finely granulate to vermiculate. According to Islam (1982), similar forms lose all three anterior intercalary and three adjoining precingulars in archeopyle formation. Size: length 34-46 µm, width 33-43 µm.
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Original diagnosis: Drugg and Loeblich, 1967, p.182
Tract small, oval, neatly tabulated. A short horn, 4-5 µm long, is located at the apex of the tract. This small horn is probably related to the apical pore of the present day marine Peridinium. There are no horns at the antapex. A slightly helicoid cingulum is present midway between the apices. The tabulation is 4', 3a, 7'', 5c, 5''', 1a. pl., 1d-pl., 1s. pl., 1p. pl., 2''''. The archeopyle is formed by the loss of the six-sided intercalary plate 2a. The sulcal area contains one anterior platelet, a right and left median platelet, and a posterior ventral plate. The median platelet is usually weakly expressed or absent. A raised small dark area in the center of the sulcal area is presumably related to the flagellar fin of the motile stage. The large posterior ventral plate (p. pl.) entirely fills the lower part of the sulcus. The sutures are low and finely and clearly denticulate. The wall varies from smooth, to finely granulate, to vermiculate. Endophragm and periphragm not clearly differentiated, but both layers are seemingly thin.