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A NEW ARMORED DINOSAUR (ANKYLOSAURIA) FROM BEIPIAO BASIN,
LIAONING PREVINCE, NORTHEASTERN CHINA
VERTEBRATA PALASIATICA Vol.40 No.4 pp.276-285
Ankylosaurs are a major group of ornithischains with broad and low bodies,
distributed mainly an Asia and North America. thei are most identified by
their dermal armor. the earliest ankylosaurs are Scellidosaurus and
Bienosaurus from the Early Jurassic (aliassic Stage) of England and China
(Romer, 1968; dong, 2001).
A new genus and species og Thyreophora (Ankylosauria)-Crichtonsaurus bohlini
gen. et sp. nov., is described in this paper.
The generic name is dedicated to Mr. Michael Crichton, author of the book.
The specific name is dedicated to Dr. B. Bohlin, a well-known Swedish
Collector of certebrate fossil including several ankylosaurs along the Silk
Road, Northwestern China.
The specimens came from the Sunjiawan Formation of Beipiao Basin,
Liaoning Province, northeastern China. The newly found ankylosaur fossil
supports the Late Cretaceous age of this unit (Cenomanian-Turonian).
The materials contain a fragment of left mandible bearing three teeth
(IVPP V 12745); two cervical vertebrae, acomplete dorsal (IVPP V12746);
four sacral and caudal verbrae, complete scapula, coracoid, humerus, and
femur, as well as various plates and scutes of dermal armor (LPM 101).
LPM is the abbreviation of the Paleontology Museum of Liaoning,
Crichtonsaurus is a medium-sized ankylosaur, 3metersin length on the
basis lingth of vertebrae. The mandible is thin and without outer surface
ornamentation. The teeth are small, and typically ankylosaurid in shape.
The crown of each tooth is symmetrical with 4 or 5 marginal denticles.
The cingulum is strong on the base of crown. Small ridges are found on
fllater side of the crown. The centra of cervical vertebrae are short and
amphicoelous. The cnetra of dorsal vertebrae are amphiplatyan, with
upward-pointing diapophyses. The centra of anterior caudal vertebrae are
broad and comparatively short with long transverse precesses. the scapula
and coracoid are not fused together as ascapulocoracoid. Dermal plates,
scutes, and spikes vry in size and form.