L'évolution et la dispersion géographique du groupe de Nummulites gizehensis (Forskal)

Abstract

Nummulites gizehensis is the oldest fossil described (Pline, Strabon) and the most famous because it constitues a part of the limestone of the Pyramids of Gizeh. The old studies (Ph. de la Harpe, 1881-1883 ; R. Said, 1951) had shown the great variety of these species and had tried to study the repartition of different varieties. After to have defined the ancestors of the N. gizehensis group, we sketch the phylogeny of this. The situation of the different varieties is in conformation with the Planctonics chart at the Fayoum area. Afterward a selected dispersion across the Mesogea, nay across the Atlantic is evoked.

Precursors of the Nummulites gizehensis and N. partschi group from Egypt

“…were introduced and established from different localities in different parts of the Tethys without an understanding of their sequential or phylogenetic order. Blondeau et al (1984) believed that the species of this group evolved biphyletically. In the present work, the authors however, suggests that this group might have evolved polyphyletically.…”