Ellipsagelosphaera britannica

Coccolithus britannicus Stradner, 1963

In plan view under cross-polarised light, all parts exhibit inclined extinction lines and length-fast (-) elongation. The extinction lines are dextrogyre on the distal side, and their typical angle is about 67° on the distal shield, but they can not be measured in the tube cycle due to the oblique orientation of the tube cycle segments. The apparent angle between extinction on the tube cycle is 73°, corresponding to an obliquity angle of 17°.

The elliptical placolith consists of single-tiered distal and proximal shields, a double tube cycle and a central area spanned by a disjunct traverse bar. 

Perch-Nielsen, K., 1968c. Der Feinbau und die Klassifikation der Coccolithen aus dem Maastrichtien von Danemark. Biologiske Skrifter, Kongelige Danske Videnskabernes Selskab 16, 1-96.

Stradner, H. 1963. New contributions to Mesozoic stratigraphy by means of nannofossils. Proceedings of the Sixth World Petroleum Congress. Section 1 Paper 4: 167-183.