Temporal range: Late Jurassic[1] ~161.2 to 158.7 Ma - Oxfordian
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Holotype skull
Holotype postcania
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Clade:
Dinosauria
Clade:
Saurischia
Clade:
Theropoda
Superfamily:
†Alvarezsauroidea (?)
Genus:
†Haplocheirus Choiniere et al., 2010
Type species
†Haplocheirus sollers
Choiniere et al., 2010
Haplocheirus (/ˌhæplʊuˈkəirəs/, meaning "simple hand") is an extinct genus of theropod dinosaur from the Middle Jurassic Shishugou Formation of Xinjiang in China. It is generally considered to be an alvarezsauroid,[2][3][4][5][6] although some researchers have questioned this assignment.[7][8] The genus contains a single species, H. sollers, which is known from a mostly complete skeleton including the skull.[2]
The quality of the preservation in the only known specimen of Haplocheirus is near-perfect and preserves the animal in three dimensions. This makes Haplocheirus one of the most well-known Jurassic coelurosaurs from anywhere in the world.[2] The specimen has been relatively well-studied in comparison with other comparable taxa like Zuolong or Guanlong, which has allowed researchers to gain insights into the evolution of maniraptorans[8] as well as the sensory capabilities,[9] diet,[10] and ontogeny[11] of primitive coelurosaurs.
^Cite error: The named reference dating was invoked but never defined (see the help page).
^ abcChoiniere, J. N.; Xu, X.; Clark, J. M.; Forster, C. A.; Guo, Y.; Han, F. (2010). "A basal alvarezsauroid theropod from the Early Late Jurassic of Xinjiang, China". Science. 327 (5965): 571–574. Bibcode:2010Sci...327..571C. doi:10.1126/science.1182143. PMID 20110503. S2CID 36904501.
^Cite error: The named reference Brusatte was invoked but never defined (see the help page).
^Cite error: The named reference aorun was invoked but never defined (see the help page).
^Kubo, Kohta; Kobayashi, Yoshitsugu; Chinzorig, Tsogtbaatar; Tsogtbaatar, Khishigjav (2023). "A new alvarezsaurid dinosaur (Theropoda, Alvarezsauria) from the Upper Cretaceous Baruungoyot Formation of Mongolia provides insights for bird-like sleeping behavior in non-avian dinosaurs". PLOS ONE. 18 (11): e0293801. Bibcode:2023PLoSO..1893801K. doi:10.1371/journal.pone.0293801. PMC 10651048. PMID 37967055.
^Xu, Xing; Choiniere, Jonah; Tan, Qingwei; Benson, Roger B.J; Clark, James; Sullivan, Corwin; Zhao, Qi; Han, Fenglu; Ma, Qingyu; He, Yiming; Wang, Shuo; Xing, Hai; Tan, Lin (2018). "Two Early Cretaceous Fossils Document Transitional Stages in Alvarezsaurian Dinosaur Evolution". Current Biology. 28: 2853–2860.e3. doi:10.1016/j.cub.2018.07.057. PMID 30146153.
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^Cite error: The named reference skull1 was invoked but never defined (see the help page).
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the only known specimen of Haplocheirus is near-perfect and preserves the animal in three dimensions. This makes Haplocheirus one of the most well-known...
alvarezsauroids, such as Haplocheirus, which is the basalmost of the Alvarezsauroidea (from the Late Jurassic, Asia). The discovery of Haplocheirus extended the stratigraphic...
Arctometatarsalia or Paul Sereno's Ornithomimiformes. The discovery of Haplocheirus, which exhibits transitional features between the more derived alvarezsaurs...
coelurosaurs from the Late Jurassic of China including Shishugounykus and Haplocheirus are suggested to represent early alvarezsaurs, however, this has been...
most basal of their family, but the discovery of a more basal member, Haplocheirus, disproved that when its fossils were discovered in China. Holtz Jr....
postcranial morphologies intermediate between the typical theropod forelimb of Haplocheirus and the highly reduced forelimbs and minute teeth of Late Cretaceous...
Haplocanthosaurus "Haplocanthus" – preoccupied name, now known as Haplocanthosaurus Haplocheirus Harpymimus Haya Hecatasaurus – junior synonym of Telmatosaurus "Heilongjiangosaurus"...
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