[dinosaur] Chaohusaurus brevifemoralis, new ichthyosauriform species from Triassic of China (free pdf)

Ben Creisler
[email protected]


A new paper in open access:


Chaohusaurus brevifemoralis sp. nov.

Jian-dong Huang, Ryosuke Motani, Da-yong Jiang, Andrea Tintori, Olivier
Rieppel, Min Zhou, Xin-Xin Ren & Rong Zhang (2019)
The new ichthyosauriform Chaohusaurus brevifemoralis (Reptilia,
Ichthyosauromorpha) from Majiashan, Chaohu, Anhui Province, China.
PeerJ 7:e7561
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.7717_peerj.7561&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=VRG9lctAiVgc4X31tReXknGdI2cDMwdrLn0CA_-AgQA&s=y-Sao8W_vINn5812bgRUdo-ymrZqvtm5bYoP83PI3UI&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__peerj.com_articles_7561_&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=VRG9lctAiVgc4X31tReXknGdI2cDMwdrLn0CA_-AgQA&s=d8OcrpypW4LNf-ZFCBX0Ix7jBRMhJVn-bj39jBFQovg&e= 
Free pdf:
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A new species of ichthyosauriform is recognized based on 20 specimens,
including nearly complete skeletons, and named Chaohusaurus brevifemoralis.
A part of the specimens was previously identified as Chaohusaurus
chaoxianensis and is herein reassigned to the new species. The new species
differs from existing species of Chaohusaurus in a suite of features, such
as the bifurcation of the caudal peak neural spine and a short femur
relative to trunk length. The specimens include both complete and partially
disarticulated skulls, allowing rigorous scrutiny of cranial sutures. For
example, the squamosal does not participate in the margin of the upper
temporal fenestra despite previous interpretations. Also, the frontal
unequivocally forms a part of the anterior margin of the upper temporal
fenestra, forming the most medial part of the anterior terrace. The skull
of the holotype largely retains three-dimensionality with the scleral rings
approximately in situ, revealing that the eyeball was uncovered in two
different directions, that is, laterally and slightly dorsally through the
main part of the orbit, and dorsally through the medial extension of the
orbit into the skull roof. This skull construction is likely a basal
feature of Ichthyosauromorpha. Phylogenetic analyses place the new species
as a sister taxon of Chaohusaurus chaoxianensis.

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