Polacanthine ankylosaur dinosaur first discovered in Asia

Dec 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: New hadrosauroid dinosaur from the Early Late Cretaceous of Shanxi Province, China

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

add to favorites email to friend print save as pdf

Related Stories

New forms of dinosaur eggs (Dictyoolithids) found

Feb 05, 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 ...

Paleontologists discover new oofamily of dinosaur egg

Oct 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 ...

Recommended for you

Bloody souvenir not from decapitated French king: DNA

1 hour ago

Two centuries after the French people beheaded King Louis XVI and dipped their handkerchiefs in his blood, DNA analysis has thrown new doubt on the authenticity of one such rag kept as a morbid souvenir.

Archaeologists, tribe clash over Native remains

21 hours ago

Archaeologists and Native Americans are clashing over Indian remains and artifacts that were excavated during a construction project in the San Francisco Bay Area, but then reburied at an undisclosed location.

User comments : 0

More news stories

Male-biased tweeting

Today women take an active part in public life. Without a doubt, they also converse with other women. In fact, they even talk to each other about other things besides men. As banal as it sounds, this is far ...