Jorgensen
Flat disk not thickened in the center, with clearly defined circular concentric rings, the innermost rosette-shaped. Diameter of disc: ca. 150 µm.
Ref.: Petrushevskaya (1967), Boltovskoy and Vrba (1988).
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Jorgensen
Flat disk not thickened in the center, with clearly defined circular concentric rings, the innermost rosette-shaped. Diameter of disc: ca. 150 µm.
Ref.: Petrushevskaya (1967), Boltovskoy and Vrba (1988).
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