Cylindralithus serratus
Set number: 1858
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10µm
In the mobile mount
Cylindralithus serratus Bramlette & Martini, 1964
The elliptical species of Cylindralithus features a high protolith outer wall, a narrow and low inner wall with overlapping segments (Figure 33 in Varol, 2025a), and a vacant central area. It exhibits inclined extinction lines at an angle of approximately 65° on the inner wall on the distal side and shows length-fast (−) elongation. The proximal rim extends beyond the outer wall, with both structures displaying length-fast (−) elongation in the side view. Cylindralithus serratus differs from Cylindralithus crassus because it is elliptical, whereas the latter is circular.
Bramlette, M. N. & Martini, E. 1964. The great change in calcareous nannoplankton fossils between the Maastrichtian and Danian. Micropaleontology. 10(2): 291-322.
Varol, O. 2025a. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222
Holotype
Cylindralithus serratus
Bramlette & Martini, 1964
Early Maastrichtian
Ripley Formation, Alabama, USA