O'Connor, J.-M. Wang, X.-L. Clark, A. Kuo, P.-C. Davila, R. Wang, Y. Zheng, X.-T. Zhou, Z.-H. 2025 A new small-bodied longipterygid (Aves: Enantiornithes) from the Aptian Jiufotang Formation preserving unusual gastroliths Palaeontologia Electronica 28 a56 Archaeopteryx Jeholornis Sapeornis Confuciusornis Changchengornis Eoconfuciusornis Protopteryx Orienantius Eopengornis Parapengornis Junornis Concornis Elsornis Eoalulavis Cathayornis Eocathayornis Eoenantiornis Gobipteryx Iberomesornis Longipteryx Longirostravis Neuquenornis Pengornis Rapaxavis Shanweiniao Hebeiornis_Vescornis Vorona Schizooura Jianchangornis Archaeorhynchus Longicrusavis Apsaravis Hongshanornis Yanornis Patagopteryx Yixianornis Gansusyumenensis Iteravis Ichthyornis Hesperornis Parahesperornis Vegavis Anas Gallus Bellulornis Fortunguavis shenqiornis Sulcavis Bohaiornis Parabohaiornis Longusunguis Zhouornis Gretcheniao Neobohaiornis STM7_dash_156 Osteology Maximum Parsimony Based on reanalysis of the original matrix. OConnor_etal_2025a