Evolution and taxonomy of Paragloborotalia kugleri (Bolli

The evolutionary lineage of “Globorofalia ” kugleri (planktonic foraminifer) spanning the interval from Zone P22 (late Oligocene) to late Zone N4 (early Mio-cene) begins with the ancestral form, “Globorofalia” pseudokugleri Blow, and ends with “Globorotalia ” kug-leri Bolli. On the basis of the spiny honeycomb wall texture, the entire lineage is placed in the genus Para-globorofalia Cifelli. The wall texture of “Globorofalia” kugleri group is in fact similar to that described by Cifelli for the Paragloborofalia opima group. Paraglo-borotalia pseudokugleri differs from Paragloborotalia kugleri in having less arched sutures, a rounded profile and peripheral margin, and a lesser maximum number of chambers in the last whorl