Euornithes

thumb|Bréchet, keel sternum

Euornithes (from the Greek word '' meaning "true birds") is a natural group which includes the most recent common ancestor of all avialans closer to modern birds than to the enantiornithines. This group was defined in the PhyloCode by Juan Benito and colleagues in 2022 as "the largest clade containing Vultur gryphus, but not Enantiornis leali and Cathayornis yandica''".

Patagopteryx is an extinct monotypic genus of euornithean dinosaurs that lived during the Late Cretaceous, around 80 mya, in what is now the Sierra Barrosa in northwestern Patagonia, Argentina. About the size of a chicken, it is the earliest known unequivocal example of secondary flightlessness: its skeleton shows clear indications that the ancestors of Patagopteryx were flying animals, though other studies find earlier diverging theropods to be secondarily flightless.

thumb|230px|Ichthyornis skeletons

Jianchangornis a genus of basal ornithuromorph dinosaurs. Fossils were recovered from the Jiufotang Formation at Liaoning, China.

Songlingornithidae is a family of basal euornithean dinosaurs from the Early Cretaceous of China. All known specimens come from the Jiufotang Formation and the Yixian Formation, dating to the early Barremian and Aptian ages, 125–120 million years ago.

Zhongjianornis is a genus of beaked, pigeon-sized birds from the early Cretaceous period of China. It is known from one fossil found at Jianchang, Liaoning Province, in rocks of the Jiufotang Formation, representing the type species Zhongjianornis yangi.

Eogranivora is a bird genus, belonging to the Ornithuromorpha, that lived in the area of present-day China during the Early Cretaceous. Its type species is Eogranivora edentulata.

Schizooura is a genus under the classification of basal ornithuromorph dinosaurs, which are dinosaurs that are relatives of modern birds. This feathery creature was from the Early Cretaceous period (125.5 million years ago) in modern-day western Liaoning, China The Schizooura was a ground forager, meaning it collected whatever it could find from the floor. The bird evolved differently compared to other modern birds, as its beak is toothless. The remains were discovered in Jiufotang Formation deposits. Any information about the bird is relatively unknown, as only one fossil was ever discovered.

Archaeorhynchus (meaning "ancient snout") is a genus of beaked avialans from the early Cretaceous period. A fossil of its only known species, Archaeorhynchus spathula, was first reported in 2005 by Zhou & Zhang to have been found in Yixian Formation rocks at Yixian, Liaoning province, China, showing a well-preserved and essentially complete skeleton. Two more complete specimens were found in Lower Cretaceous deposits of Jianchang, Liaoning, northeastern China, preserving new anatomical information. These deposits are 120 million years old, whereas the original specimen was 125 million years ol

Patagopterygiformes is an extinct group of large terrestrial ornithuromorph dinosaurs from the Late Cretaceous of South America. It contains at most three genera: Patagopteryx, Alamitornis and possibly Kuszholia.

Yumenornis is an extinct genus of basal ornithuromorph dinosaurs known from the Early Cretaceous Xiagou Formation of Changma Basin, Gansu Province of northwestern China. Yumenornis was first named by Ya-Ming Wang, Jingmai O'Connor, Da-Qing Li and Hai-Lu You in 2013 and the type species is Yumenornis huangi.

Chaoyangia is an extinct genus of euornithean birds, containing the single species Chaoyangia beishanensis. This species is known from a single fossil specimen consisting of a partial skeleton including vertebra, ribs, hips, and upper legs. The specimen (museum catalog number IVPP V9934) was discovered in the Jiufotang Formation near the city of Chaoyang in Liaoning province, China. This rock formation has been dated to the Aptian age of the Early Cretaceous period, 120 million years ago.

Iteravis () is an extinct genus of ornithuromorph bird known from the Early Cretaceous Jiufotang Formation of what is today the Liaoning Province of China. The genus contains a single species, Iteravis huchzermeyeri, named in honor of the archosaur palaeontologist Dr. Fritz Huchzermeyer, who died shortly before Iteravis was described. The relationships between Iteravis and species of Gansus have been debated, with some researchers arguing for a synonymy between the former and G. zheni, and others recovering a closer relationship between the two genera within the family Gansuidae.

Bellulornis ("beautiful bird") is an extinct genus of ornithuromorph avialan. It is known from a complete postcranial skeleton lacking the skull which was unearthed from the rocks of the Early Cretaceous-aged Jiufotang Formation in Liaoning Province, China. It was originally given the genus name Bellulia, meaning "beautiful", in reference to the fact that the skeleton was preserved in a pose reminiscent of a dancer. However, it was discovered after publication that the genus Bellulia was preoccupied by an extant moth. The authors then amended the name to Bellulornis, adding the Ancient Greek s

Changmaornis is an extinct genus of basal ornithuromorph dinosaur known from the Early Cretaceous Xiagou Formation of Changma Basin, Gansu Province of northwestern China. Changmaornis was first named by Ya-Ming Wang, Jingmai K. O'Connor, Da-Qing Li and Hai-Lu You in 2013 and the type species is Changmaornis houi.

Zhyraornis is a genus of prehistoric bird from the late Cretaceous period (middle Turonian, 92 mya). Its fossils have been found in Bissekty Formation deposits near Dzharakuduk in the Kyzyl Kum, Uzbekistan. Two species have been assigned to this genus: Zhyraornis kashkarovi and Zhyraornis logunovi. Both are known only from partial pelvic bones (synsacra).

Ambiortiformes is a group of prehistoric ornithuromorph dinosaurs. ==Cladistic analyses== The first species to be included, Ambiortus dementjevi, lived sometime during the Barremian age between 136.4 and 125 million years ago in today's Mongolia. A. dementjevi belongs to the Ornithuromorpha (the group containing modern birds but not enantiornithes), according to all published cladistic analyses. However, the exact position of the species within this group has been controversial. Most analyses have found it to be either an unresolved member of the Ornithurae, or a more primitive member of Ornit

Brevidentavis (meaning "short-toothed bird") is a genus of ornithuromorph dinosaurs from the Early Cretaceous (Aptian) Xiagou Formation of Gansu Province, China. The genus contains a single species, Brevidentavis zhangi, known from a specimen including a partial skull and cervical vertebrae. The Brevidentavis holotype shows unusually blunt teeth in its lower jaw, which the describing authors suggest may indicate a specialized diet. Its dentition shows similarities with those of hesperornitheans, and indeed it may be an early member of that group.

Jiuquanornis is an extinct genus of basal ornithuromorph dinosaur known from the Early Cretaceous Xiagou Formation of Changma Basin, Gansu Province of northwestern China. Jiuquanornis was first named by Ya-Ming Wang, Jingmai K. O'Connor, Da-Qing Li and Hai-Lu You in 2013 and the type species is Jiuquanornis niui.