Description: Ring-shaped coccoliths with open central-area. No clear shield development, spines on distal side. Strongly birefringent.
Remarks:
Range: Palaeogene to NN6.
| |
|
|
|
|
| |
|
|||
| |
|
|
|
|
Synonyms:
Variant: Elliptical forms, with narrow rims, occur in NN5-6.
Post new comment