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Qijianglong, new mamenchisaurid sauropod from Late Jurassic of China

Ben Creisler

A new online paper:

Lida Xing, Tetsuto Miyashita, Jianping Zhang, Daqing Li, Yong Ye, Toru
Sekiya, Fengping Wang & Philip J. Currie (2015)
A new sauropod dinosaur from the Late Jurassic of China and the
diversity, distribution, and relationships of mamenchisaurids.
Journal of Vertebrate Paleontology (advance online publication)

Qijianglong guokr, gen. et sp. nov., represents a mamenchisaurid
eusauropod from the Late Jurassic of southern China. The holotype
consists of an incomplete skull, partly articulated axial skeleton,
and fragmentary appendicular skeleton. A well-preserved braincase and
skull roof provide rare insights into the poorly known neurocranial
anatomy of mamenchisaurids and reveal a unique combination of
characters such as an accessory tuber at the base of planar
basipterygoid process and parietal excluding frontal from the anterior
margin of the supratemporal fenestra. The cervical vertebrae have a
distinct finger-like process extending from the postzygapophyseal
process beside a zygapophyseal contact. Qijianglong is the first
mamenchisaurid from the Late Jurassic of China that is definitively
distinct from Mamenchisaurus, indicating greater morphological and
taxonomic diversity of the poorly represented Late Jurassic
mamenchisaurids. The occurrence of Qijianglong is consistent with a
scenario in which mamenchisaurids formed an endemic sauropod fauna in
the Late Jurassic of Asia. Phylogenetically, Qijianglong represents a
relatively plesiomorphic mamenchisaurid lineage. The mamenchisaurids
form an ancient clade of basal eusauropod dinosaurs that likely
appeared in the Early Jurassic. A cladistic analysis highlights the
interrelationships of mamenchisaurids and suggests guidelines for
mamenchisaurid taxonomic revision. It may be desirable to restrict
generic names to the type species in order to avoid confusion.


SUPPLEMENTAL DATA—Supplemental materials are available for this
article for free at www.tandfonline.com/UJVP