Karoulilithos ayseguliae
Set number: 48
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10µm
in mobile mount
Karoulilithos ayseguliae Varol, 2025b
Octolithus - Agnini et al., 2007, pl.1, fig.1
Octolithus-Sphenolithus integrate - Agnini et al., 2007, pl. 1, figs. 2-3.
Circular species of Karoulilithos have a reel like core with unequal ends surrounded by several segments.
In honour of Aysegul Yilmaz, Yalova, Turkey.
The coarse segments surround the distinctly narrower end of the reel, whereas the finely striated rim surrounds the wider end of the reel.
Karoulilithos ayseguliae is distinguished from Semihololithus by being circular in plan view, whereas the latter is elliptical in plan view. The central core is reel like with unequal ends in Karoulilithos ayseguliae, but the central body has segmented only at the one end.
This unusual species is an excellent marker
Agnini, C., Fornaciari, E., Raffi, I., Rio, D., Röhl, U. & Westerhold, T. 2007. High-resolution nannofossil biochronology of middle Paleocene to early Eocene at ODP Site 1262: implications for calcareous nannoplankton evolution. Marine Micropaleontology, 64: 215-248.
Varol, O. 2025b. New observation on Paleocene holococcoliths. Neues Jahrbuch für Geologie und Paläontologie,
Holotype
Karoulilithos ayseguliae
Varol, in prep.
Early Paleocene
Santos Basin, Brazil