[dinosaur] Siamraptor, new carcharodontosaurian theropod from Lower Cretaceous of Thailand (free pdf)

Ben Creisler
[email protected]

A new paper in open access PLoS ONE:

Siamraptor suwati gen. et sp. nov.

Duangsuda Chokchaloemwong, Soki Hattori, Elena Cuesta, Pratueng Jintasakul,
Masateru Shibata & Yoichi Azuma (2019)
A new carcharodontosaurian theropod (Dinosauria: Saurischia) from the Lower
Cretaceous of Thailand.
PLoS ONE 14(10): e0222489
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1371_journal.pone.0222489&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=lSo6P0RbGSEOC7W6bIxWIYplBbx-B3fqVNjz2iDcxBY&s=0HI9PT_tA1wypqyI0toVJHU1ygDzZmPmwobK72JI3Hw&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__journals.plos.org_plosone_article-3Fid-3D10.1371_journal.pone.0222489&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=lSo6P0RbGSEOC7W6bIxWIYplBbx-B3fqVNjz2iDcxBY&s=PtGCezbPrnecdNdHehuDr8npCn3KsNVTaYTlcJXsKGE&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__journals.plos.org_plosone_article_file-3Fid-3D10.1371_journal.pone.0222489-26type-3Dprintable&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=lSo6P0RbGSEOC7W6bIxWIYplBbx-B3fqVNjz2iDcxBY&s=8hOBdmVnF9ZHHYSgw9-eZKnpktOeAx9-Mu5j7E1AxF8&e= 

The isolated fossil remains of an allosauroid theropod from the Lower
Cretaceous Khok Kruat Formation of Khorat, Thailand, are described in this
study. Detailed observations support the establishment of a new
allosauroid, Siamraptor suwati gen. et sp. nov. This new taxon is based on
a composite cranial and postcranial skeleton comprising premaxilla,
maxilla, jugal, surangular, prearticular, articular, vertebrae, manual
ungual, ischium, tibia, and pedal phalanx. It is distinguished from other
allosauroids by characters such as a jugal with straight ventral margin and
dorsoventrally deep anterior process below the orbit, a surangular with a
deep oval concavity at the posterior end of the lateral shelf and four
posterior surangular foramina, a long and narrow groove along the suture
between the surangular and the prearticular, an articular with a foramen at
the notch of the suture with the prearticular, an anterior cervical
vertebra with a pneumatic foramen (so-called ‘pleurocoel’) excavating
parapophysis, and cervical and posterior dorsal vertebrae penetrated by a
pair of small foramina bilaterally at the base of the neural spine. The
presence of a huge number of camerae and pneumatopores in cranial and axial
elements reveals a remarkable skeletal pneumatic system in this new taxon.
Moreover, the phylogenetic analyses revealed that Siamraptor is a basal
taxon of Carcharodontosauria, involving a new sight of the
paleobiogeographical context of this group. Siamraptor is the best
preserved carcharodontosaurian theropod in Southeast Asia, and it sheds new
light on the early evolutionary history of Carcharodontosauria.


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