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- n. Alternative spelling of Paleogene.
Sorry, no etymologies found.
Most authors continue to regard all Palaeogene 'didelphids' (alphadontids, peradectines and herpetotheriines) as didelphimorphians, and hence as crown-group marsupials, but I'm not aware of any recent phylogenetic studies on the phylogenetic position of these groups (at least, not without checking the literature).
Bijl PK, et al. (2009) Early Palaeogene temperature evolution of the southwest Pacific Ocean.
See esp. the paragraph beginning: "During the early Palaeogene …" which pointedly ends with the exemplary and modest statement: "The nature of the triggering remains unknown."
Using palaeogeographic reconstructions and palaeo-oceanographic modelling, we find that strong surface currents flowed from northeast Mozambique and Tanzania eastward towards Madagascar during the Palaeogene period, exactly as required by the
The sudden appearance of anatomically modern pleuronectiform groups in the Palaeogene period matches the pattern repeated by many acanthomorph clades.
It’s also been noted that lagomorphs possess similarities with the pantodonts and dinoceratans of the Palaeogene.
Furthermore, while Fox et al. (1992) were careful to exclude other possible contenders (including crocodyliforms, pterosaurs, lizards, xenarthrans and mesonychians) there were a number of Palaeogene mammal groups that they didn’t exclude, and it would have been more convincing had it been shown that these taxa could also be eliminated from comparison (H. - D. Sues, pers. comm.).