Back
Pareodinia rectangularis
Pareodinia rectangularis Yu Jingxian, 1982
Lentin in Lentin and Williams, 1989, after examining the holotype, concluded that it is of organic composition, but is not a dinoflagellate. Below, 1990 listed this species under "Nomina dubia", terming it palynodebris.
Holotype: Yu Jingxian, 1982, pl.1, fig.1
Age: Late Kimmeridgian-Berriasian
Description: Cysts rectangular or subrectangular, their length being twice their width. Periphragm only, 1 - 1.5 µm thick. Surface has fine granules, with a chaotic intermingling of sutural ridges. Apical horn large, 64.4 - 66 µm long and 30 - 34 µm wide. End truncated or slightly pointed, with a circular apical pore connecting to outer furrow. Intercalary archeopyle. Paracingulum indicated by low, flat sutural ridge.
Size: Cysts 156.4 - 180 µm long and 60 - 85 µm wide.
Comparison: This new species is differentiated from Pareodinia rostrata by being rectangular in shape and having its paracingulum indicated by a low, flat sutural ridge.
Lentin in Lentin and Williams, 1989, after examining the holotype, concluded that it is of organic composition, but is not a dinoflagellate. Below, 1990 listed this species under "Nomina dubia", terming it palynodebris.
Holotype: Yu Jingxian, 1982, pl.1, fig.1
Age: Late Kimmeridgian-Berriasian
Description: Cysts rectangular or subrectangular, their length being twice their width. Periphragm only, 1 - 1.5 µm thick. Surface has fine granules, with a chaotic intermingling of sutural ridges. Apical horn large, 64.4 - 66 µm long and 30 - 34 µm wide. End truncated or slightly pointed, with a circular apical pore connecting to outer furrow. Intercalary archeopyle. Paracingulum indicated by low, flat sutural ridge.
Size: Cysts 156.4 - 180 µm long and 60 - 85 µm wide.
Comparison: This new species is differentiated from Pareodinia rostrata by being rectangular in shape and having its paracingulum indicated by a low, flat sutural ridge.