title: Smooth and rugose wall textures in earliest Danian trochospiral planktic foraminifera from Tunisia
abstract: New scanning electron microscopy (SEM) photographs of planktic foraminiferal specimens from Tunisian sections (El Kef, An Settara, Elles) have revealed the occurrence of two lineages of primitive trochospiral species in the lowermost Danian. The first lineage to appear, which evolves at the P0-Pa transition, exhibits a smooth and/or granular wall texture (with pore-murals), and its species were attributed to the parvularugoglobigerinids (Parvularugoglobigerina and Palaeoglobigerina). The second 
journal: Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen