A new Early Cretaceous enantiornithine bird from Liaoning Province of northeastern China, Shengjingornis yangi, gen. et sp. nov., is reported. This new bird possesses the following unique combination of features: a long rostrum, with some teeth in the front; short nasal; slender jugal; Y- shaped furcula, with expanded distal end of the hypocleidum; cake-like sternum, with a low and caudally distributed keel; strut-like and caudally concave coracoid. The derived features of the scapula and the wings suggest a powerful flapping flight capability.
A new genus and species of eutriconodont mammal,Chaoyangodens lii gen.et sp.nov.,from the Dawangzhangzi bed of Yixian Formation,Lingyuan,Liaoning,is reported.The new species has a tooth formula I5-C1-P1-M3/i4-c1-p1-m4,unique among eutriconodonts in having only one premolar in lower and upper jaws,respectively,and a distinctive diastema between the canine and the premolar.Its simple incisors and reduced premolars show a mosaic combination of primitive and derived features.This new taxon adds to the diverse group of Jehol eutriconodonts.Among the known species from at least three horizons,there seems no evolutionary trend in morphology that is recognizable,except for that larger species are all from the Lujiatun bed of the Yixian Fm.A thorough and systematic analysis involving all the Jehol eutriconodonts is needed to understand their phylogenetic relationships.
