Polacanthine ankylosaur dinosaur first discovered in Asia

December 23, 2013
Polacanthine ankylosaur dinosaur first discovered in Asia
Fig.1 Proximo-middle caudal of Taohelong jinchengensis gen. et sp. nov. A, proximal view; B, distal view; C, left side view; D, right side view; E, dorsal. Credit: YANG Jing-Tao

In a study published in the latest issue of Vertebrata PalAsiatica 51(4), Dr. YOU Hai-Lu, Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences, and his collaborators from China University of Geosciences (Beijing), Gansu Geological Museum in Lanzhou, and Administration of Liujiaxia Dinosaur National Geopark in Yongjing of Gansu, described a new dinosaur, Taohelong jinchengensis gen. et sp. nov., based on material from the Lower Cretaceous Hekou Group in Lanzhou-Minhe Basin, north-central China. Taohelong represents the first occurrence of polacanthine in Asia, and provides new data for studying the evolution and biogeography of polacanthine.

The new specimens include a proximo-middle caudal vertebra, three dorsal ribs, an almost complete left ilium, and several armors including a partial sacral shield. Taohelong jinchengensis possesses three distinctive anatomical features: neural canal of proximo-middle caudal inverted trapezium, lateral edge of preacetabular process inverted "S"-shaped in dorsal view, and sacral shield composed of various-sized and irregularly-arranged osteoderms.

Polacanthine ankylosaur dinosaur first discovered in Asia
Fig.3 Armors and sacral shield of Taohelong jinchengensis gen. et sp. nov.  Credit: YANG Jing-Tao

Cladistic analysis shows that Taohelong is a member of polacanthine nodosaurid ankylosaur, and is the sister taxon of Polacanthus foxii from the Early Cretaceous Barremian of England. Polacanthinae is here defined as the most inclusive clade containing Polacanthus foxii Owen, 1865 but not Ankylosaurus magniventris Brown, 1908 or Panoplosaurus mirus Lambe, 1919. Taohelong represents the first occurrence of polacanthine in Asia, and indicates again the existence of a rich and unique dinosaur assemblage in the Lower Cretaceous Hekou Group in the Lanzhou-Minhe Basin.

Polacanthine ankylosaur dinosaur first discovered in Asia
Fig.2 Left ilium of Taohelong jinchengensis gen. et sp. nov. A, dorsal view; B, ventral view; C, anterior view; D, posterior view. Credit: YANG Jing-Tao)

Explore further: Re-evaluation of Wulagasaurus indicates Basal Hadrosaurine dinosaurs originated in Asia

More information: Read the paper: www.ivpp.cas.cn/cbw/gjzdwxb/xbwzxz/201312/P020131205318740255664.pdf

Related Stories

Paleontologists discover new oofamily of dinosaur egg

October 10, 2012

Paleontologists from the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences, found more than a dozen eggs from the lower member of the Late Cretaceous Chichengshan Formation in ...

New forms of dinosaur eggs (Dictyoolithids) found

February 5, 2013

Paleontologists from the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences, collected some dinosaur eggs of the oofamily Dictyoolithidae from the Upper Cretaceous Chichengshan ...

Recommended for you

French teen finds 560,000 year-old tooth (Update)

July 28, 2015

A 16-year-old French volunteer archaeologist has found an adult tooth dating back around 560,000 years in southwestern France, in what researchers hailed as a "major discovery" Tuesday.

The couple who Facebooks together, stays together

July 27, 2015

Becoming "Facebook official" is a milestone in modern romance, and new research suggests that activities on the popular social networking site are connected to whether those relationships last.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.