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Areoligera vermiculata
Areoligera vermiculata, Corradini, 1973
Holotype: Corradini, 1973, pl.24, fig.7
Locus typicus: Castel di Casio, Bologna, Italy
Stratum typicum: Maastrichtian
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Original description: Corradini, 1973, p. 159-160
Diagnosis:
Central body subelliptical in outline and with a vermicular surface. Antapical pole slightly bilobated. Annular and soleate complexes restricted to the dorsal surface of the cyst.
Processes thin and often connected by membrans or trabeculae.
Apical archeopyle tetratabular.
Description:
Marginate cyst with a central body dorsally convex and ventrally flat or depressed. Periphragm granular or, more commonly, slightly vermicular. It usually appears irregularly thickened at the bases of the complexes or between adjacent complexes. Their outline is not strictly circular but more similar to a square with rounded corners. Processes thin and free or often connected basally by a proximal membrane having sometimes a fenestrate appearance.
Distally the processes are bifid or slightly capitate and may be connected by trabeculae which are not always distal in position. The number and the length of processes per complex are variable. Soleate complexes with opposite but unranged concavities are restricted to the plates 3" and 3""".
The complex occurring on plate 3" is in fact located on the right of the sagittal line crossing the half of the antapical complex, of 3""" and of the main diameter of archeopyle. Linear complexes composed by two or three simple processes, are often present on the cingular area between annular complexes 2"" and 2""". 4"" and 4""".
Ventral surface free of processes.
Archeopyle apical tetratabular.
Dimensions:
Holotype: diameter of the central body 52x57 µm, length of the processes 10-20 µm.
Range: diameter of the central body 50-(52)-55x50-(57)-67 µm, length of the processes 10-(15)-20 µm.
Affinities:
This new species is very well defined by having precise and homogeneous characters, including the size of the cysts.
Areoligera vermiculata is distinguished from the previously described species referred to the genus in the vermicular surface of the central body and in the particular outline showed by the soleate complexes.
Holotype: Corradini, 1973, pl.24, fig.7
Locus typicus: Castel di Casio, Bologna, Italy
Stratum typicum: Maastrichtian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: Corradini, 1973, p. 159-160
Diagnosis:
Central body subelliptical in outline and with a vermicular surface. Antapical pole slightly bilobated. Annular and soleate complexes restricted to the dorsal surface of the cyst.
Processes thin and often connected by membrans or trabeculae.
Apical archeopyle tetratabular.
Description:
Marginate cyst with a central body dorsally convex and ventrally flat or depressed. Periphragm granular or, more commonly, slightly vermicular. It usually appears irregularly thickened at the bases of the complexes or between adjacent complexes. Their outline is not strictly circular but more similar to a square with rounded corners. Processes thin and free or often connected basally by a proximal membrane having sometimes a fenestrate appearance.
Distally the processes are bifid or slightly capitate and may be connected by trabeculae which are not always distal in position. The number and the length of processes per complex are variable. Soleate complexes with opposite but unranged concavities are restricted to the plates 3" and 3""".
The complex occurring on plate 3" is in fact located on the right of the sagittal line crossing the half of the antapical complex, of 3""" and of the main diameter of archeopyle. Linear complexes composed by two or three simple processes, are often present on the cingular area between annular complexes 2"" and 2""". 4"" and 4""".
Ventral surface free of processes.
Archeopyle apical tetratabular.
Dimensions:
Holotype: diameter of the central body 52x57 µm, length of the processes 10-20 µm.
Range: diameter of the central body 50-(52)-55x50-(57)-67 µm, length of the processes 10-(15)-20 µm.
Affinities:
This new species is very well defined by having precise and homogeneous characters, including the size of the cysts.
Areoligera vermiculata is distinguished from the previously described species referred to the genus in the vermicular surface of the central body and in the particular outline showed by the soleate complexes.