Helenemanivitia colombiana Varol, 2025a
In honour of the late Hélène Manivit (France), in recognition of her contributions to taxonomy and biostratigraphy of calcareous nannofossils.
A circular to elliptical loxolith composed of a single protolith wall, a protruding proximal rim, and a central area that may be either void or spanned by various structures.
Optical Properties: The wall and rim of Helenemanivitia exhibit first-order white interference colours in both plan and side views. This species displays inclined dextrogyre extinction lines, typically at angles around 77°, with length-fast (-) elongation on the distal side.
Placing this genus within any known family or order is difficult.
Varol, O. 2025a. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication. 29: 1-222