Wade et al., 2011). The larger benthic foraminiferal markers are the LO of Heterostegina reticulata and Pellatispira in the SBZ18 zone (Less and Özcan, 2012). The Eocene sediments of Southern Armenia, represented by the alternation of shallow and deep-water sediments, are rich in various microfossils: planktonic (PF), smaller (SBF) and larger benthic foraminifera (LBF), nannofossils, dinocysts, and rarely, radiolarians that provide direct correlation of planktonic and benthic bioevents and zonations. Recently, foraminifera, nannofossils, and dinocysts were studied from the middle Eocene to the lowermost Oligocene in Landzhar and Urtsalandzh sections, southern Armenia (Shcherbinina et al., 2017;
Caucasina oligocenica Chalilov (type species) and C. schischkinskayae (Samoilova) are shown to be separate species. The diagnoses of the genera Caucasina, Caucasinella, and Tergrigorjanzaella of the family Caucasinidae are revised and emended. Based on the structure of the test, aperture with the toothplate, and the radially crystalline wall, this family is assigned to the order Buliminida. The data on the species compo sition, geographical and stratigraphic distribution of the family Caucasinidae are expanded; the paleoecology of this group is revised. The diagnoses of the listed genera are emended and new species, Caucasina robusta, C. bogdanoviczi, C. maryensis, and Caucasinella bykovae are established.
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