A case of pore mounds in Paleogene buliminids from the Austral Basin, Argentina

Abstract

Pore mounded (mamelones centralmente perforados) wall texture is characterized by the accumulation of shell material around pores, creating mound structures described as a typical wall texture often present in serial planktonic foraminifera such as the Santonian-Paleocene triserial genus Guembelitria. A surface wall texture with well developed and distinctive pore mounds is also recorded in the Austral Basin in two phylogenetically related buliminid species, Bulimina fueguina Malumián and "Kolesnikovella" severini (Cañón and Ernst). Both species have no adequate generic assignment and both are frequent and apparently endemic to the Austral Basin.