title: THANETIAN AND EARLY YPRESIAN ORTHOPHRAGMINES (FORAMINIFERA: DISCOCYCLINIDAE AND ORBITOCLYPEIDAE) FROM THE CENTRAL WESTERN TETHYS (TURKEY, ITALY AND BULGARIA) AND THEIR REVISED TAXONOMY AND BIOSTRATIGRAPHY
abstract: The rich orthophragminid assemblages from the upper Thanetian and lower Ypresian of Turkey are discussed together with the coeval faunas from Spilecco (N Italy) and Beloslav (Bulgaria). Their taxonomy, evolution and biozonation in the Western Tethys are revised. Our biometric study is based mainly on a large number of equatorial sections of megalospheric individuals. We present the emended description of Discocyclina seunesi, D. tenuis, Orbitoclypeus multiplicatus, O. bayani and Asterocyclina ta
journal: Riviste UNIMI (Università degli studi di Milano)