Here we report a left cheek plate of Psarolepis, a postparietal shield of Youngolepis, a skull of Diabolepis, and a scale of Styloichthys from the Lianhuashan and Nahkaoling formations (Lochkovian, Lower Devonian) of Nanning, Guangxi. This marks the first report of Diabolepis and Styloichthys beside Qujing, Yunnan, and the latest occurrence of Psarolepis to date. The fossil community displays significant similarities to the Xujiachong Assemblage, and provides new data for the Lower Devonian stratigraphic correlation between southwestern China and northern Vietnam. Given the latest dating constraint based on the conodont evidence, we regard that the Xujiachong Assemblage has a much longer range than previously supposed, extending from the latest Lochkovian to the end of Pragian. We propose that the transition of the Nahkaoling and Lianhuashan formations in Nanning might correspond to the Guijiatun Formation in Qujing. The relatively large size of fish individuals from Guangxi is probably attributed to the increase in the oxygen content of the ocean.

The origin of birds from theropod dinosaurs, by any measures, is the most eye-catching evolutionary transition in the history of life, which encompasses numerous extensive morphological and biological changes. Compared to postcranium, little progress has been made regarding the evolutionary assemblage of the birds’ skull, because of few detailed early records of cranial materials of stem lineages. Anchiornis is the oldest known record of the Paraves (~160 Ma), the most inclusive clade that contains all living birds but not Caudipteryx or Epidexipteryx. With hundreds of known specimens, Anchiornis constitutes an ideal taxon for investigating morphological modifications across the theropod-bird transition, but its cranial morphology remains enigmatic. Here we present in-depth description of the cranial morphology of Anchiornis based on three-dimensional reconstruction of a well-preserved specimen, including elements from the temporal and palatal regions that are poorly recognized previously. Our study shows that Anchiornis retains the plesiomorphic dinosaurian condition in having a diapsid akinetic skull. The mixture of cranial characters, shared with dromaeosaurids, troodontids, and stemward avialans, present in Anchiornis demonstrates the complex history of early avialan cranial evolution.

Stegolophodon is an age-informative genus of mammals that had a widespread distribution during the Neogene. This paper reports the discovery of Stegolophodon fossils from the Middle Miocene lower Fotan Formation at the Zhangpu locality, Fujian Province, China. This discovery represents the first evidence of Neogene proboscidean fossils in southeastern China. The newly found molar materials have low tooth crowns, very straight lophs/lophids, and an indistinct median sulcus. The mesoconelets and posterior cingulum are well-developed, while the second posterior pretrite central conule is significantly reduced. These specimens closely resemble Stegolophodon pseudolatidens in cheek tooth morphology, and can thus be attributed to the same species. This discovery fills a gap in the fossil record of large mammals in this region during the Neogene and provides valuable insights into the evolution of proboscideans and paleoenvironments.

A controversial taxon, Hipparion plocodus, is reviewed in the present study. Hi. plocodus has been confirmed to be a valid species with definite diagnostic characteristics, represented by cranial specimens from Baode, Shanxi Province. The phylogenetic analysis performed in the present study, with a new matrix, shows that Hi. plocodus forms a monophyletic group with a European species, Hippotherium malpassii. Actually, no close relationship between so-called Hm. malpassii and the genus Hippotherium has been identified, and the record of stratigraphic range of this genus in late stage of Late Miocene is currently absent. Herein previously Hi. plocodus and Hm. malpassii have both attributed into “Hipparion” before the discovery of better material. Evolutionary stages and correlative absolute age showed that these two species should derive independently from some primitive clade. During the late stage of the Late Miocene, the development of the Asian summer monsoon enhanced the humidity of China, with forest and wood habitats expanding considerably under this setting. As the result, one Eurasian closed-habitat lineage thus extended its range into China, which had become very suited for it, give rise to “Hi.” plocodus.