4 Works

Data from: Morphological datasets fit a common mechanism much more poorly than DNA sequences and call into question the Mkv model

Pablo A. Goloboff, Michael Pittman, Diego Pol & Xing Xu
The Mkv evolutionary model, based on minor modifications to models of molecular evolution, is being increasingly used to infer phylogenies from discrete morphological data, often producing different results from parsimony. The critical difference between Mkv and parsimony is the assumption of a “common mechanism” in the Mkv model, with branch lengths determining that probability of change for all characters increases or decreases at the same tree branches by the same exponential factor. We evaluate whether...

Data from: The tetrapod fauna of the upper Permian Naobaogou Formation of China: a new species of Elginia (Parareptilia, Pareiasauria)

Jun Liu & Gabriel S. Bever
The pareiasaur fossil record in China is poor compared to that of Russia or South Africa. A new pareiasaur specimen is here reported from the upper Permian Naobaogou Formation of the Daqing Mountains, Nei Mongol, China. It is recognized as a new species of Elginia, a taxon otherwise known only from the upper Permian Cutties Hillock Sandstone of Scotland. Diagnostic features include a moderately developed cheek flange; prominent otic notch (formed between squamosal and quadratojugal...

Data from: Reinterpretation of a previously described Jehol bird clarifies early trophic evolution in the Ornithuromorpha

Xiaoting Zheng, Jingmai K. O'Connor, Xiaoli Wang, Yan Wang & Zhonghe Zhou
STM35-3 from the Yixian Formation is the only Early Cretaceous ornithuromorph preserving direct evidence of granivory. The crop contains numerous seeds and the preservation of gastroliths presumably within the ventriculus indicates this diet was paired with the presence of a gastric mill as in living granivorous birds. STM35-3 was originally referred to Hongshanornis longicresta, member of a diverse clade of small, basal ornithuromorphs with elongate hindlimbs known as the Hongshanornithidae. Hindlimb proportions suggest that hongshanornithids...

Data from: Redescription of Phymolepis cuifengshanensis (Antiarcha: Yunnanolepididae) using high-resolution computed tomography and new insights into anatomical details of the endocranium in antiarchs

Yajing Wang & Min Zhu
Background. Yunnanolepidoids constitute either the basal-most consecutive segments or the most primitive clade of antiarchs, a highly diversified jawed vertebrate group from the Silurian and Early Devonian periods. Although the general morphology of yunnanolepidoids is well established, their endocranial features remain largely unclear, thus hindering our further understanding of antiarch evolution, and early gnathostome evolution. Phymolepis cuifengshanensis, a yunnanolepidoid from the Early Devonian of southwestern China, is re-described in detail to reveal the information on...

Registration Year

  • 2018
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Resource Types

  • Dataset
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Affiliations

  • Institute of Vertebrate Paleontology and Paleoanthropology
    4
  • Chinese Academy of Sciences
    3
  • University of Chinese Academy of Sciences
    2
  • Linyi University
    1
  • Johns Hopkins University School of Medicine
    1
  • University of Hong Kong
    1
  • National Scientific and Technical Research Council
    1