Fig.1 Oldest Ionoscopiform Fish from the Anisian (242–247 million years ago), Middle Triassic marine deposits of Luoping, eastern Yunnan Province of China, Robustichthys luopingensis (a), and life reconstruction (b). (Image by XU Guang-Hui and WU Feixiang)

Fig.2. Phylogenetic relationships of Robustichthys luopingensis within Neopterygii, and maps illustrating geographical distribution of Ionoscopiformes in three different geological epochs. (Image by XU Guang-Hui)