Hadrosauroidea

Bactrosaurus (; meaning "Club lizard," "baktron" = club + sauros = lizard) is a genus of herbivorous hadrosauroid dinosaur that lived in Asia during the Late Cretaceous, from about 96 to 85 million years ago. The position Bactrosaurus occupies in the Cretaceous makes it one of the earliest known hadrosauroids, and although it is not known from a full skeleton, Bactrosaurus is one of the best known of these early hadrosauroids, making its discovery a significant finding.

Altirhinus (; "high nose") is a genus of hadrosauroid ornithopod dinosaur from the Early Cretaceous period of Mongolia.

Telmatosaurus (meaning "marsh lizard") is a genus of basal hadrosauromorph dinosaur from the Late Cretaceous of Romania. It was relatively small for its group, measuring approximately in length and in body mass, which has been explained as an instance of insular dwarfism.

Hadrosauroidea is a clade or superfamily of ornithischian dinosaurs that includes the "duck-billed" dinosaurs, or Hadrosauridae, and all dinosaurs more closely related to them than to Iguanodon. Their remains have been recovered in Asia, Europe, Africa and the Americas. Many primitive hadrosauroids, such as the Asian Probactrosaurus and Altirhinus, have traditionally been included in a paraphyletic (unnatural grouping) "Iguanodontidae". With cladistic analysis, the traditional Iguanodontidae has been largely disbanded, and probably includes only Iguanodon and perhaps its closest relatives.

Eolambia (meaning "dawn lambeosaurine") is a genus of herbivorous hadrosauroid dinosaur from the early Late Cretaceous of the United States. It contains a single species, E. caroljonesa, named by paleontologist James Kirkland in 1998. The type specimen of Eolambia was discovered by Carole and Ramal Jones in 1993; the species name honors Carole. Since then, hundreds of bones have been discovered from both adults and juveniles, representing nearly every element of the skeleton. All of the specimens have thus far been found in Emery County, Utah, in a layer of rock known as the Mussentuchit Membe

Probactrosaurus (meaning "before Bactrosaurus") is an extinct genus of basal hadrosauroid iguanodontian dinosaur that lived in China during the Early Cretaceous period.

Gilmoreosaurus (meaning "Charles Whitney Gilmore's lizard") is a genus of hadrosauromorphan dinosaur from the Late Cretaceous of Asia. The type species is Gilmoreosaurus mongoliensis, known from the Iren Dabasu Formation of Inner Mongolia, dating to 96 million years ago. Additional specimens have been described as distinct species, including G. atavus from the Khodzhakul Formation of Uzbekistan, and G. arkhangelskyi from the Bissekty Formation, also of Uzbekistan. However, these are based on very fragmentary remains, and their classification is dubious. An additional species, G. kysylkumense,

Tethyshadros ("Tethyan hadrosauroid") is a genus of hadrosauroid dinosaur from the Late Cretaceous (Campanian) Lipica Formation (previously thought to come from the younger informal "Liburnia Formation") of Trieste, Italy. The type and only species is T. insularis.

Arstanosaurus (meaning "Arstan lizard" after the Arstan well) is a genus of hadrosauroid dinosaur from the Late Cretaceous-aged (Santonian-Campanian) Bostobe Formation of Kazakhstan. It has had a confusing history, being considered a hadrosaurid, a ceratopsid, or both at the same time (chimeric).

Claosaurus ( ; Greek κλάω, klao meaning 'broken' and , sauros meaning 'lizard'; "broken lizard", referring to the odd position of the fossils when discovered) is a genus of hadrosauroid dinosaur that lived during the Late Cretaceous Period (Santonian-Campanian) of what is now North America. The type and only known valid species is Claosaurus agilis. Traditionally classified as an early member of the family Hadrosauridae, a 2008 analysis found Claosaurus to be outside of the clade containing Hadrosaurus and other hadrosaurids, making it the closest non-hadrosaurid relative of true hadrosaurids

Jeyawati (meaning "grinding mouth" in the Zuni language) is a genus of hadrosauroid dinosaur which lived during the Turonian stage of the Late Cretaceous. The type species, J. rugoculus, was described in 2010, based on fossils recovered in the U.S. state of New Mexico.

Nanyangosaurus is a genus of herbivorous ornithopod dinosaur belonging to the Hadrosauromorpha that lived in the Late Cretaceous of present-day Henan Province, China.

Tanius (meaning "of Tan") is a genus of hadrosauroid dinosaur. It lived in the Late Cretaceous of China. The type species, named and described in 1929 by Carl Wiman, is Tanius sinensis. The generic name honours the Chinese paleontologist Tan Xichou ("H.C. Tan"). The specific epithet refers to China. In 2010 Gregory S. Paul estimated the length of Tanius at and its weight at .

Equijubus (; Mǎzōng meaning "horse mane" after the area Mǎzōng Mountain 马鬃山 in which it was found), is a genus of herbivorous hadrosauroid dinosaur from the Early Cretaceous (Albian stage) of northwestern China.

Hypsibema is an extinct genus of very large basal hadrosauroid dinosaur from the Late Cretaceous (Campanian) of eastern North America. The type species is H. crassicauda, with a potential second species in H. missouriensis (now generally placed in its own genus, Parrosaurus). Most remains of H. crassicauda, including the type specimen, are known from the Tar Heel Formation of North Carolina, in addition to some remains known from the Marshalltown Formation of New Jersey.

Gobihadros is a genus of basal hadrosauroid dinosaur that lived during the Late Cretaceous period in what is now the Bayanshiree Formation (dated to the Cenomanian-Santonian) of Mongolia. It contains only the type species Gobihadros mongoliensis, which has an estimated length of .

thumb|Different angle of the mounted skeleton Ratchasimasaurus (meaning "Nakhon Ratchasima lizard") is a genus of iguanodontian ornithopod dinosaur from Early Cretaceous (Aptian stage) Khok Kruat Formation of Nakhon Ratchasima province in northeastern Thailand. The type and only species is R. suranareae, named after Thao Suranari, a 19th-century war heroine. It was considered by one study to be a nomen dubium, diagnosed with characters widespread in Styracosterna.

Penelopognathus (meaning "wild duck jaw") is a genus of hadrosauroid dinosaur which lived in the Early Cretaceous Bayin-Gobi Formation in what is now China. The discovery of this taxon contributes to the hypothesis that hadrosauroids originated in Asia. The type species, Penelopognathus weishampeli, named after David Weishampel, was described by Godefroit, Li, and Shang in 2005, based on fragmentary jaw fossils.

Lophorhothon is a genus of hadrosauroid dinosaur from the Late Cretaceous of Alabama, and possibly Georgia and North Carolina. It was the first dinosaur genus discovered in Alabama, in the United States.

Xuwulong is a genus of hadrosauroid dinosaur from the Early Cretaceous period of what is now Yujingzi Basin in the Jiuquan area, Gansu Province of northwestern China. It is known from the holotype, GSGM F00001, an articulated specimen including a complete cranium, almost complete axial skeleton, and complete left pelvic girdle recovered from the Xinminbao Group. Xuwulong was named by You Hailu, Li Daqing, and Liu Weichang in 2011, and the type species is Xuwulong yueluni; the binomial name as a whole refers to Professor Wang Yue-lun; "Xu-wu" is his courtesy name.

Levnesovia is a genus of hadrosauroid dinosaur from the Late Cretaceous (Turonian) Bissekty Formation of Uzbekistan. It was related to Bactrosaurus. The type species is L. transoxiana. The genus name honours the late Russian paleontologist Lev Nessov, and the specific name refers to the ancient region Transoxiana. It is known from partial skulls, maxillae, dentaries and numerous bones of the postcranial skeleton.

Orthomerus (meaning "straight femur") is a genus of dubious hadrosaurid dinosaur from the Late Cretaceous of the Netherlands. It is today an obscure genus, but in the past was conflated with the much better known Telmatosaurus.

Bolong (meaning "Bo's dragon") is a genus of iguanodontian dinosaur known from the Early Cretaceous Yixian Formation of western Liaoning Province, China. It lived about 125 million years ago in the earliest Aptian.

Siamodon is an extinct genus of iguanodontian ornithopod dinosaur from Early Cretaceous deposits of northeastern Thailand.

Koshisaurus is a monospecific genus of basal hadrosauroid from the Kitadani Formation in Japan. The discovery of the genus suggests that hadrosauroids had higher diversity along the eastern margin of Asia in the Early Cretaceous. "Koshi" means an old Japanese regional name including Fukui prefecture where fossils of the genus were discovered.

Choyrodon is a genus of hadrosauroid dinosaur from the Early Cretaceous (Albian) Khuren Dukh Formation of Mongolia. The type and only species is Choyrodon barsboldi. The generic name is derived from the city of Choyr, and -odon, from Latin for tooth; the specific name barsboldi honours paleontologist Rinchen Barsbold. The material consists of a holotype partial skull and cervical ribs, with two other partial skulls both with associated postcranial material. It was found to be the sister taxon of Eolambia.

Huehuecanauhtlus is a genus of hadrosauroid dinosaur known from the Late Cretaceous (Santonian stage) of Michoacán, western Mexico. It contains a single species, Huehuecanauhtlus tiquichensis.

Batyrosaurus is an extinct genus of herbivorous basal hadrosauroid dinosaur known from the Late Cretaceous Bostobe Formation (Santonian to Campanian stage) of central Kazakhstan. It contains a single species, Batyrosaurus rozhdestvenskyi. It is possible that Batyrosaurus represents the same taxon as the doubtful Arstanosaurus akkurganensis as both were found from the same formation.

Gongpoquansaurus (meaning "Gongpoquan reptile") is an extinct genus of basal hadrosauroid dinosaur that was not formally named until 2014, while the name was a nomen nudum for many years previously. It is known from IVPP V.11333, a partial skull and postcranial skeleton. It was collected in 1992 at locality IVPP 9208–21, from the Albian Zhonggou Formation (Xinminpu Group), in Mazongshan, Gansu Province, China. The specimen was first described and named by Lü Junchang in 1997 as the third species of Probactrosaurus, Probactrosaurus mazongshanensis. Following its description, several studies fou

Zhanghenglong is an extinct genus of herbivorous hadrosauroid iguanodont dinosaur known from the Late Cretaceous (middle Santonian stage) Majiacun Formation in Xixia County of Henan Province, China. It contains a single species, Zhanghenglong yangchengensis, represented by a disarticulated and partial cranium and postcranial skeleton.

Gonkoken (meaning "similar to a wild duck or swan") is an extinct genus of hadrosauroid ornithopod dinosaur from the Late Cretaceous Dorotea Formation of Chilean Patagonia. The genus contains a single species, Gonkoken nanoi, known from disarticulated bones of multiple individuals.

Qianjiangsaurus (meaning "Qianjiang lizard") is an extinct genus of hadrosauroidean ornithopod dinosaurs from the Late Cretaceous Zhengyang Formation of China. The genus contains a single species, Q. changshengi, known from a partial skeleton. Qianjiangsaurus is one of the few hadrosauroids named from south China, and it indicates important fauna connections between similarly aged formations in Mongolia.

Protohadros (meaning "first hadrosaur") is a genus of basal hadrosaurid dinosaur from the early Late Cretaceous (Cenomanian stage, approximately 100-93.9 million years ago) of what is now Texas, United States. It is represented by the species Protohadros byrdi, known from a partially complete skull and associated postcranial remains recovered from the Woodbine Formation. Protohadros was one of the earliest derived hadrosaurs in North America.

Fylax (meaning "keeper") is a genus of hadrosauroid ornithopod from the Late Cretaceous Figuerola Formation of Spain. The genus contains a single species, Fylax thyrakolasus, known from a nearly complete left dentary.

Sirindhorna is a genus of hadrosauroid ornithopod dinosaur from Early Cretaceous deposits of northeastern Thailand.

Zuoyunlong (meaning "Zuoyun County dragon") is an extinct genus of herbivorous ornithopod dinosaur belonging to the Hadrosauroidea that lived during the Late Cretaceous in the area of present China.

Datonglong is an extinct genus of herbivorous ornithopod dinosaur, belonging to the Hadrosauroidea, which lived in the Late Cretaceous period in present-day China. Its type species is Datonglong tianzhenensis.

Yunganglong is an extinct genus of basal hadrosauroid dinosaur known from the early Late Cretaceous lower Zhumapu Formation of Zuoyun County, Shanxi Province of northeastern China. It contains a single species, Yunganglong datongensis.

Plesiohadros (meaning "near to hadrosaurids") is an extinct genus of hadrosauroid dinosaur. It is known from a partial skeleton including the skull collected at Alag Teg locality, from the Campanian Alagteeg Formation of southern Mongolia. The type species is Plesiohadros djadokhtaensis.

Hadrosauromorpha is a clade of iguanodontian ornithopods, defined in 2014 by David B. Norman to divide Hadrosauroidea into the basal taxa with compressed manual bones and a pollex, and the derived taxa that lack them. The clade is formally defined in the PhyloCode as "the largest clade containing Hadrosaurus foulkii, but not Probactrosaurus gobiensis". This results in different taxon inclusion depending on the analysis.

Portellsaurus (meaning "Portell Lizard") is a genus of hadrosauroid dinosaur from the Lower Cretaceous Margas de Mirambell Formation of Spain. The genus contains a single species, Portellsaurus sosbaynati, known from a partial right dentary. == Discovery and naming == Portellsaurus was discovered in 1998 by Miquel Guardiola, Julián Yuste and Silvia Fabregat in a site near Mas de Curolles. The generic name, Portellsaurus, comes from the Portell de Morella, the town where the holotype was recovered, and the specific name, sosbaynati, refers to Vicente Sos Baynat, a Spanish geologist who was the

species of reptile (fossil)

Kryptohadros () is an extinct genus of hadrosauroid ornithopod dinosaur known from the Late Cretaceous (Maastrichtian age) Densuș-Ciula Formation of Romania. The genus contains a single species, Kryptohadros kallaiae, known from a partial skull and skeleton. Phylogenetic analyses revealed Kryptohadros is closely related to the coeval Transylvanian Telmatosaurus and the Italian Tethyshadros, together forming a group of southeastearn European-endemic taxa, called the Telmatosauridae. Kryptohadros is the second named non-hadrosaurid hadrosauroid from the Hațeg Basin, following Telmatosaurus, whic