Notes on the systematics, morphology and biostratigraphy of fossil holoplanktonicMollusca, 211. Early andMiddle Eocene (Ypresian-Lutetian) holoplanktonic Mollusca (Gastropoda) from Uzbekistan

Six samples from two localities in Eocene deposits of central Uzbekistan yielded 14 species of holoplanktonic molluscs (1 Pterotracheoidea, 9 Limacinoidea, 3 Cavolinioidea and 1 Cymbulioidea). Limacina asiatica spec. nov. and L. dzheroiensis spec. nov. are introduced. The assemblages are interpreted as belonging to the later part of Pteropod Zone 9 (Ypresian, two samples) and the early part of Zone 10 (Ypresian- Lutetian, four samples) and correlated with the existing global nannoplankton zonation (zones NP 13 to lower NP 15).