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A new paper is online that you may find interesting: Matías J. Motta; Federico L. Agnolín; Federico Brissón Egli; Fernando E. Novas (2020). New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana. The Science of Nature 107 (3): Article number 24. doi:10.1007/s00114-020-01682-1. The recovery of Overoraptor as sister to Rahonavis in a clade sister to Avialae shows that not all non-pygostylian paravians were unenlagiids. If this phylogenetic placement holds water, then Rahonaviformes Livezey and Zusi, 2007 and Rahonavi
haventbaptized posted a topic in Fossil NewsGenuine fossils with exquisitely preserved plumage from the Late Jurassic and Early Cretaceous of north-eastern China have recently revealed that bird-like theropod dinosaurs had long pennaceous feathers along their hindlimbs and may have used their four wings to glide or fly. Thus, it has been postulated that early bird flight might initially have involved four wings. Link : https://link.springer.com/epdf/10.1007/s00114-017-1496-y?author_access_token=qK5jILmlXqTUfzaXSeOT4fe4RwlQNchNByi7wbcMAY5XtMiIuzLHT0w7pfMEQCqN57cyEs2GIzoqs5Z9sbEt05ydpRV-wedb1KJ5MwJh8Kg2RuubzDV9r0AJl8jBoI_iqK1-