The name Huaxiagnathus is derived from the ChineseHua Xia, 華夏, a traditional word for "China", and from the Greekgnathos, Latinised into gnathus, meaning "jaw."
Description
Scale diagram of the two known specimens with a human, (holotype in green)
Skeletal diagram
The holotype (CAGS-IG-02-301, Chinese Academy of Geological Sciences, Beijing) specimen was collected from the Yixian Formation (Jehol Group, Aptian) at Dabangou Village, Sihetun area, near Beipiao City, in western Liaoning Province. The holotype consists of an essentially complete skeleton, lacking only the end of the tail, preserved on five large slabs. Partially digested bones of an unidentified vertebrate were found within the holotype specimen.[1] Another, larger specimen of Huaxiagnathus was discovered earlier in the Yixian Formation of the Sihetun area (NGMC 98-5-003, National Geological Museum of China, Beijing), but damage and mistakes made during its preparation rendered it unsuitable as a holotype.
Cladistic analysis indicates that Huaxiagnathus is the basal most known compsognathid, as indicated by its unspecialized forearm.
Hwang et al. (2004, pp. 14–15) diagnosed this genus as follows: differing from all other known compsognathids in having a very long posterior process of the premaxilla that overlaps the antorbital fossa, a manus equal to the combined lengths of the humerus and radius, large manual unguals I and II which are subequal in length and 167% the length of manual ungual III, a first metacarpal which has a smaller proximaltransverse width than the second metacarpal, and the presence of a reduced olecranon process on the ulna.[1]
References
^ abcHwang, S. H., Norell, M. A., Ji, Q., and Gao, K. (2004). "A large compsognathid from the Early Cretaceous Yixian Formation of China." Journal of Systematic Palaeontology, 2(1): 13-30.
huaxiagnathus, genus, theropod, dinosaur, from, lower, cretaceous, china, compsognathid, large, that, group, about, half, meter, longer, than, compsognathus, larger, specimens, sinosauropteryx, with, largest, specimen, about, meters, feet, length, temporal, ra. Huaxiagnathus is a genus of theropod dinosaur from the Lower Cretaceous of China It was a compsognathid large for that group at about half a meter longer than Compsognathus and larger specimens of Sinosauropteryx with the largest specimen about 1 8 meters 5 9 feet in length 1 HuaxiagnathusTemporal range Early Cretaceous 125 Ma PreꞒ Ꞓ O S D C P T J K Pg N Huaxiagnathus orientalis fossil displayed in Hong Kong Science MuseumScientific classificationKingdom AnimaliaPhylum ChordataClade DinosauriaClade SaurischiaClade TheropodaFamily CompsognathidaeGenus HuaxiagnathusHwang et al 2004Species H orientalisBinomial name Huaxiagnathus orientalisHwang et al 2004The name Huaxiagnathus is derived from the Chinese Hua Xia 華夏 a traditional word for China and from the Greek gnathos Latinised into gnathus meaning jaw Description Edit Scale diagram of the two known specimens with a human holotype in green Skeletal diagram The holotype CAGS IG 02 301 Chinese Academy of Geological Sciences Beijing specimen was collected from the Yixian Formation Jehol Group Aptian at Dabangou Village Sihetun area near Beipiao City in western Liaoning Province The holotype consists of an essentially complete skeleton lacking only the end of the tail preserved on five large slabs Partially digested bones of an unidentified vertebrate were found within the holotype specimen 1 Another larger specimen of Huaxiagnathus was discovered earlier in the Yixian Formation of the Sihetun area NGMC 98 5 003 National Geological Museum of China Beijing but damage and mistakes made during its preparation rendered it unsuitable as a holotype Cladistic analysis indicates that Huaxiagnathus is the basal most known compsognathid as indicated by its unspecialized forearm Hwang et al 2004 pp 14 15 diagnosed this genus as follows differing from all other known compsognathids in having a very long posterior process of the premaxilla that overlaps the antorbital fossa a manus equal to the combined lengths of the humerus and radius large manual unguals I and II which are subequal in length and 167 the length of manual ungual III a first metacarpal which has a smaller proximal transverse width than the second metacarpal and the presence of a reduced olecranon process on the ulna 1 References Edit a b c Hwang S H Norell M A Ji Q and Gao K 2004 A large compsognathid from the Early Cretaceous Yixian Formation of China Journal of Systematic Palaeontology 2 1 13 30 Dinosaurs portal Retrieved from https en wikipedia org w index php title Huaxiagnathus amp oldid 1065808396, wikipedia, wiki, book, books, library,
