编辑：Evgeniy ZVONOK Gerald MAYR Leonid GOROBETS
New material of the Eocene marine bird Kievornis Averianov et al., 1990 and a reassessment of the affinities of this taxon
Evgeniy ZVONOK , Gerald MAYR, Leonid GOROBETS
Abstract New specimens of Eocene bird Kievornis Averianov et al., 1990 are described. It is shown that this taxon existed in the Middle Eocene of the Tethys Sea, from the early Lutetian to the early Bartonian, and in an area spanning at least from Kiev in central Ukraine to Ikovo in the eastern part of the country. We tentatively refer Kievornis to the Procellariiformes. However, although the taxon exhibits features characteristic of the Procellariiformes, it also, and perhaps plesiomorphically, lacks some derived features of these birds.
Key words Ukraine, Tethys, Middle Eocene, Procellariiformes, Kievornis