Xunmenglong

Xunmenglong Temporal range: Early Cretaceous, Hauterivian 130.7 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Reconstructed skeleton
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia
Clade:	Theropoda
Family:	†Compsognathidae
Genus:	†Xunmenglong Xing et al., 2019
Type species
†Xunmenglong yinliangis Xing et al., 2019

Xunmenglong (from Chinese: 迅猛龍/迅猛龙; pinyin: Xùnměnglóng; lit. 'swift fierce dragon') is a genus of compsognathid theropod dinosaur from the Huajiying Formation from Hebei Province in China. The type and only species is Xunmenglong yinliangis. The holotype material consists of a pelvis, tail base and hindlimbs that had previously been part of a chimera containing three different animals. The animal is described as being the smallest known member of Compsognathidae, being about the size of the sub-adult Scipionyx holotype specimen or approximately 0.5 meters (1.6 feet) in length.^[1]

Classification

In the original description, Xunmenglong is recovered as a Compsognathid in a polyomy including Compsognathus, Huaxiagnathus, and Juravenator. However, Andrea Cau (2024) recovered Xunmenglong not as a Compsognathid, but instead as a basal member of Tetanurae.^[2]

References

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Theropoda

Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Avemetatarsalia Clade: Dinosauria
Avemetatarsalia see Avemetatarsalia Theropoda see below↓

Theropoda
Theropoda Chindesaurus? Daemonosaurus? Eodromaeus? Erythrovenator Guaibasaurus? Nhandumirim? Tawa? Herrerasauria? Neotheropoda Dilophosaurus Dolichosuchus? Dracovenator Gojirasaurus Lepidus Liliensternus Lophostropheus Notatesseraeraptor Sarcosaurus Shuangbaisaurus Sinosaurus Tachiraptor Velocipes? Zupaysaurus Coelophysoidea Dracoraptor? Panguraptor Pendraig Podokesaurus Powellvenator Coelophysidae Camposaurus Coelophysis Lucianovenator Megapnosaurus? Panguraptor? Procompsognathus Pterospondylus? Segisaurus Averostra see below↓ Dubious neotheropods Teinurosaurus Halticosaurus

Averostra
Averostra Dornraptor Lophostropheus? Ceratosauria Berberosaurus Fosterovenator? Jubbulpuria Lukousaurus? Saltriovenator Ceratosauridae Ceratosaurus Genyodectes Abelisauroidea Betasuchus? Lametasaurus? Ornithomimoides? Ozraptor? Noasauridae Afromimus? Austrocheirus? Berthasaura Compsosuchus? Dahalokely? Deltadromeus? Genusaurus? Kiyacursor Ligabueino Spinostropheus Elaphrosaurinae Elaphrosaurus Huinculsaurus Limusaurus Noasaurinae Laevisuchus Masiakasaurus Noasaurus Velocisaurus Vespersaurus Abelisauridae Chenanisaurus Dryptosauroides? Eoabelisaurus Indosuchus Kryptops Kurupi Rugops Spectrovenator Tarascosaurus Tralkasaurus Xenotarsosaurus Majungasaurinae Arcovenator Dahalokely? Genusaurus Indosaurus Majungasaurus Rahiolisaurus? Rajasaurus Carnotaurinae Majungasaurinae? Brachyrostra Dahalokely? Ekrixinatosaurus Elemgasem Guemesia Ilokelesia Llukalkan Niebla Rahiolisaurus? Skorpiovenator Thanos Furileusauria Abelisaurus Aucasaurus Carnotaurus Elemgasem? Koleken Pycnonemosaurus Quilmesaurus Viavenator Tetanurae see below↓

Tetanurae
Tetanurae Calamospondylus? Chienkosaurus? Chilesaurus? Chuandongocoelurus Cruxicheiros? Cryolophosaurus Kaijiangosaurus Kayentavenator Monolophosaurus Pandoravenator Sinosaurus? Szechuanosaurus Vectaerovenator Orionides Megalosauroidea Yunyangosaurus Piatnitzkysauridae Condorraptor Marshosaurus Piatnitzkysaurus Xuanhanosaurus? Megalosauria Streptospondylus? Megalosauridae Eustreptospondylus Megalosaurinae Duriavenator Megalosaurus Torvosaurus Wiehenvenator Afrovenatorinae Afrovenator Dubreuillosaurus Leshansaurus Magnosaurus Piveteausaurus Poekilopleuron? Spinosauridae Camarillasaurus? Cristatusaurus Iberospinus Ostafrikasaurus? Baryonychinae Baryonyx Protathlitis Riojavenatrix Suchosaurus? Vallibonavenatrix? Ceratosuchopsini Ceratosuchops Riparovenator Suchomimus Spinosaurinae Camarillasaurus? Ichthyovenator Irritator Oxalaia Siamosaurus Spinosaurini Sigilmassasaurus Spinosaurus Avetheropoda see below↓

Avetheropoda
Avetheropoda Gasosaurus? Lourinhanosaurus? Carnosauria Altispinax Monolophosaurus? Megalosauridae? Spinosauridae? Allosauroidea Asfaltovenator Erectopus Xuanhanosaurus? Piatnitzkysauridae? Metriacanthosauridae Xuanhanosaurus? Yangchuanosaurus Metriacanthosaurinae Metriacanthosaurus Shidaisaurus Siamotyrannus Sinraptor Allosauria Allosauridae Allosaurus Antrodemus? Epanterias? Saurophaganax? Carcharodontosauria Datanglong Lusovenator Siamraptor Siats? Ulughbegsaurus Veterupristisaurus Neovenatoridae Chilantaisaurus? Gualicho? Neovenator Siats? Megaraptora? Carcharodontosauridae Acrocanthosaurus Altispinax? Concavenator Eocarcharia Kelmayisaurus Lajasvenator Sauroniops Shaochilong Taurovenator Veterupristisaurus Carcharodontosaurinae Carcharodontosaurus Giganotosaurini Giganotosaurus Mapusaurus Meraxes Tyrannotitan Megaraptora? Aoniraptor Bahariasaurus? Deltadromeus? Fukuiraptor Phuwiangvenator Rapator Siats? Chilantaisaurus? Megaraptoridae Aerosteon Australovenator Maip Megaraptor Murusraptor Orkoraptor Tratayenia Coelurosauria see below↓

Coelurosauria
Coelurosauria Aratasaurus Asiamericana Bahariasaurus? Bicentenaria Chilantaisaurus? Gualicho? Richardoestesia Sciurumimus? Vayuraptor Xinjiangovenator Zuolong Tyrannoraptora Tyrannosauroidea Chingkankousaurus Labocania? Coeluridae? Coelurus Tanycolagreus? Proceratosauridae Guanlong Kileskus Proceratosaurus Sinotyrannus Yutyrannus Pantyrannosauria Alectrosaurus Aviatyrannis Bagaraatan? Dilong Eotyrannus Jinbeisaurus Juratyrant Moros Santanaraptor Stokesosaurus Suskityrannus Timimus? Timurlengia Xiongguanlong Megaraptora? Eutyrannosauria Appalachiosaurus Bistahieversor Dryptosaurus Tyrannosauridae Albertosaurinae Albertosaurus Gorgosaurus Tyrannosaurinae Nanuqsaurus Alioramini Alioramus Qianzhousaurus Daspletosaurini Daspletosaurus Thanatotheristes Teratophoneini Dynamoterror Lythronax Teratophoneus Tyrannosaurini Tarbosaurus Tyrannosaurus Zhuchengtyrannus Maniraptoromorpha see below↓ Dubious coelurosaurs Iliosuchus Kakuru Phaedrolosaurus Shanyangosaurus

Maniraptoromorpha
Maniraptoromorpha Coelurus? Juravenator Ornitholestes Neocoelurosauria Aniksosaurus Compsognathidae Aniksosaurus? Aristosuchus Beipiaognathus? Compsognathus Huaxiagnathus Mirischia Scipionyx? Sinocalliopteryx Sinosauropteryx Xunmenglong Maniraptoriformes Compsognathidae? Ornithomimosauria Arkansaurus Aviatyrannis? Calamosaurus? Hexing Kinnareemimus Nedcolbertia Nqwebasaurus Thecocoelurus? Valdoraptor Macrocheiriformes Harpymimus Pelecanimimus Shenzhousaurus Deinocheiridae Beishanlong Deinocheirus Garudimimus Harpymimus? Paraxenisaurus? Tyrannomimus Ornithomimidae Aepyornithomimus Anserimimus Archaeornithomimus "Coelosaurus" Dromiceiomimus Gallimimus Ornithomimus Qiupalong Rativates Sinornithomimus Struthiomimus Tototlmimus Maniraptora see Maniraptora includes birds

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