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Timeline of hadrosaur research

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Skeletal mounts of Shantungosaurus giganteus

This timeline of hadrosaur research is a chronological listing of events in the history of paleontology focused on the hadrosauroids, a group of herbivorous ornithopod dinosaurs popularly known as the duck-billed dinosaurs. Scientific research on hadrosaurs began in the 1850s, when Joseph Leidy described the genera Thespesius and Trachodon based on scrappy fossils discovered in the western United States. Just two years later he published a description of the much better-preserved remains of an animal from New Jersey that he named Hadrosaurus.

The early 20th century saw such a boom in hadrosaur discoveries and research that paleontologists' knowledge of these dinosaurs "increased by virtually an order of magnitude" according to a 2004 review by Horner, Weishampel, and Forster. This period is known as the great North American Dinosaur rush because of the research and excavation efforts of paleontologists like Brown, Gilmore, Lambe, Parks, and the Sternbergs. Major discoveries included the variety of cranial ornamentation among hadrosaurs as scientist came to characterize uncrested, solid crested, and hollow crested species. Notable new taxa included Saurolophus, Corythosaurus, Edmontosaurus, and Lambeosaurus. In 1942 Richard Swann Lull and Wright published what Horner, Weishampel, and Forster characterized as the "first important synthesis of hadrosaurid anatomy and phylogeny".

More recent discoveries include gigantic hadrosaurs like Shantungosaurus giganteus from China. At 15 meters in length and nearly 16 metric tons in weight it is the largest known hadrosaur and is known from a nearly complete skeleton.

Hadrosaur research has continued to remain active even into the new millennium. In 2000, Horner and others found that hatchling Maiasaura grew to adult body sizes at a rate more like a mammal's than a reptile. That same year, Case and others reported the discovery of hadrosaur bones in Vega Island, Antarctica. After decades of such dedicated research, hadrosaurs have become one of the best understood group of dinosaurs.

19th century

1850s

Illustration of the Thespesius syntype
Illustration of Trachodon teeth
The first mounted dinosaur skeleton, that of Hadrosaurus

1856

1858

  • Leidy described the new genus and species Hadrosaurus foulkii. He thought it was an amphibious animal.

1860s

1868

  • Leidy collaborated with artist Benjamin Waterhouse Hawkins to mount Hadrosaurus foulkii for the Academy of Natural Sciences of Philadelphia. This became both the first mounted dinosaur skeleton ever mounted for public display and also one of the most popular exhibits in the history of the academy. Estimates have the Hadrosaurus exhibit as increasing the number of visitors by up to 50%.

1869

1870s

1870

1871

1872

1874

1875

1876

1880s

Orthomerus dolloi limb bones
Type specimen of Claosaurus

1883

1888

1889

1890s

1890

1892

20th century

1900s

1900

1902

1903

1910

Skull of the Saurolophus osborni holotype
Artist's restoration of Edmontosaurus regalis

1910

1912

1913

  • Brown described the new genus and species Hypacrosaurus altispinus.
  • Cutler excavated a juvenile Gryposaurus now catalogued by the Canadian Museum of Nature as CMN 8784. The site of the excavation has since been designated "quarry 252".
  • Winter: Cutler partly prepared the young Gryposaurus specimen, possibly in Calgary while working on dinosaurs for Euston Sisely.

1914

1915

  • Charles H. Sternberg's crew excavated a Corythosaurus from quarry 243 in Dinosaur Provincial Park, Alberta, Canada. The specimen would later be displayed at the Calgary Zoo.
  • Matthew observed that fossils of hadrosaur eggs and hatchlings were absent in coastal areas and suggested that hadrosaurs may have preferred nesting grounds further inland. He believed that these inland nesting grounds were actually where hadrosaurs first evolved and therefore to breed, hadrosaurs retraced their ancestors route back to their place of origin. After hatching, the young hadrosaurs would spend some time inland maturing before migrating out to more coastal areas.
Prosaurolophus maximus specimen collected 1921, Royal Ontario Museum

1916

1917

1918

1920s

Artist's restoration of Parasaurolophus
Mummified Edmontosaurus annectens

1920

1922

  • William Parks described the new genus and species Parasaurolophus walkeri.
  • Krausel reported fossil gut contents from an Edmontosaurus annectens mummy. He described the material as including conifer needles and branches, deciduous foliage, and possible small seeds or fruit.
  • Abel argued that the plant material Krausel argues was the fossilized remains of the gut contents of an Edmontosaurus annectens was actually deposited by flowing water.

1923

1924

Artist's restoration of Tanius

1925

1926

1929

1930s

Skeletal mount of Bactrosaurus

1930

1931

1933

Skeletal mount of Nipponosaurus

1935

1936

1939

1940s

Skeletal mount of Orthomerus

1942

1943

1945

1946

1950s

Illustration of the skull of Tsintaosaurus

1952

1953

1958

1960s

Skeletal reconstruction of Parasaurolophus cyrtocristatus

1960

1961

1964

  • Ostrom supported Krausel's 1922 claim that fossil plant material found associated with an Edmontosaurus annectens mummy was actually its gut contents.

1967

  • Russel and Chamney studied distribution of hadrosaur in Maastrichtian North America. The concluded that Edmontosaurus regalis lived near the coasts while Hypacrosaurus altispinus and Saurolophus osborni lived slightly more inland.

1968

1970s

1970

  • Galton argued that the anatomy of the hadrosaur pelvis was more consistent with a horizontal posture like that seen in modern flightless birds than with the "kangaroo" posture they were often reconstructed in.

1971

  • Dodson argued that hadrosaurs may not have fed exclusively on land.

1973

1975

Skeletal mount of Maiasaura and hatchlings
  • Dodson found evidence for sexual and ontogenetic dimorphism in two different kinds of lambeosaurine using morphometrics.

1976

1979

  • Brett-Surman erected the new genus Gilmoreosaurus to house the species Mandschurosaurus mongoliensis. He also described the new genus and species Secernosaurus koerneri.
  • Brett-Surman was unable to determine where hadrosaurs first evolved.
  • Horner and Makela described the new genus and species Maiasaura peeblesorum. They argued that hadrosaurs cared for their young for an extended period after hatching.
  • Horner argued that hadrosaur fossils found in marine deposited were simply the preserved remains of individuals that had washed out to sea from a terrestrial place of origin.
  • Dong described the new genus and species Microhadrosaurus nanshiungensis.

1980s

Hotton argued that some hadrosaurs may have migrated

1980

  • Hotton argued that some hadrosaurs may have migrated seasonally in a north–south direction.
Artist's restoration of Barsboldia
Skeletal reconstruction and size comparison Lambeosaurus (now Magnapaulia) laticaudus

1981

1982

  • Suslov and Shilin described the new genus and species Arstanosaurus akkurganensis.
  • Carpenter disputed the idea that hadrosaurs only nested in upland environments, instead arguing that fossil hadrosaur eggs and hatchlings were only absent from coastal deposits because the chemistry of the ancient soils were simply too acidic to preserve them.
  • Thulborn argued that hadrosaurs may have been able to run at speeds of up to 14–20 km/h for sustained periods.

1983

  • Horner observed that Maiasaura peeblesorum is only known to have lived in the upper regions of contemporary coastal plains.
  • Weishampel described hadrosaur chewing and cranial kinetics.
  • Weishampel and Weishampel reported the presence of hadrosaur remains on the Antarctic Peninsula.
Illustration of a Jaxartosaurus skull
Skull of Brachylophosaurus

1984

  • Wu described the new genus and species Jaxartosaurus fuyuensis.
  • Milner and Norman argued that hadrosaurs evolved in Asia.
  • Horner observed that fossil eggs and hadrosaur hatchlings were common in sediments deposited in the upper regions of what were once coastal plains.
  • Weishampel described hadrosaur chewing and cranial kinetics.
  • Norman described hadrosaur chewing and cranial kinetics.
  • Weishampel argued that hadrosaurs fed mainly on vegetation of 2 m in height or less but had a maximum browsing height of 4 m.
  • Bonaparte and others described the new species Kritosaurus australis.

1985

  • Norman and Weishampel described hadrosaur chewing and cranial kinetics.

1987

  • Horner observed that fossil eggs and hadrosaur hatchlings were common in sediments deposited in the upper regions of what were once coastal plains.
  • Farlow argued that their highly developed chewing abilities and large gut volumes meant hadrosaurs werehighly adapted to feeding on nutrient poor, fibrous vegetation.

1988

1990s

1990

  • Brett-Surman described the new genus Anatotitan for Anatosaurus copei.
  • Horner argued that the hadrosaurids were not a natural group, and instead that the two major groups of hadrosaurs, the generally uncrested hadrosaurines and the crested lambeosaurs had separate origins within the Iguanodontia. Horner thought that the uncrested hadrosaurs were descended from a relative of Iguanodon, while the crested lambeosaurs were descended from a relative of Ouranosaurus. However, this proposal would find no support in any subsequent research publication.
  • Weishampel and Horner found the Hadrosauridae to be a natural group after all. They also found cladistic support for the traditional division of Hadrosauridae into the subfamilies Hadrosaurinae and Lambeosaurinae.
  • Weishampel reported the presence of hadrosaurs on the Antarctic peninsula.

1991

1992

Scientists began reconstructing the hadrosaur family tree in the 1990s.

1993

  • Hunt and Lucas described the new genus and species Anasazisaurus horneri. They also described the new genus and species Naashoibitosaurus ostromi.
  • Weishampel, Norman, and Griogescu named the clade Euhadrosauria.
  • Weishampel and others proposed a node-based definition for the Hadrosauridae: the descendants of the most recent common ancestor shared by Telmatosaurus and Parasaurolophus. They found the hadrosaurs to be a natural group, contrary to Horner's 1990 arguments that the hadrosaur subfamilies were descended from different kinds of iguanodont. They also found cladistic support for the traditional division of Hadrosauridae into the subfamilies Hadrosaurinae and Lambeosaurinae.
  • Clouse and Horner reported the presence of hadrosaur egg, embryo and hatchling fossils from the Judith River Formation of Montana. Since these sediments were deposited in a low-lying coastal plain, the researchers' discovery contradicted previous hypotheses that hadrosaurs either didn't nest in lowland areas or that local ancient soil was too acidic to preserve them.
Skull of Hypacrosaurus stebingeri

1994

1996

  • Chin and Gill described Maiasaura peeblesorum coprolites from an ancient nesting ground of that species. The coprolites were "blocky", irregularly-shaped masses that preserved plant fragments. The researchers identified it as feces because the masses contained fossilized dung beetle burrows. The plant material suggested a diet consisting mainly of conifer stems.

1997

  • Forster found the hadrosaurs to be a natural group, contrary to Horner's 1990 arguments that the hadrosaur subfamilies were descended from different kinds of iguanodont. They also found cladistic support for the traditional division of Hadrosauridae into the subfamilies Hadrosaurinae and Lambeosaurinae. She preferred to define the Hadrosauridae as the most recent common ancestor of the hadrosaurines and lambeosaurines and all of its descendants. Unlike the definition used by Weishampel and others in 1993, this definition excluded Telmatosaurus.

1999

  • Sereno found the hadrosaurs to be a natural group, contrary to Horner's 1990 arguments that the hadrosaur subfamilies were descended from different kinds of iguanodont.

21st century

2000s

2000

  • Godefroit, Zan, and Jin described the new genus and species Charonosaurus jiayinensis.
  • Case and others reported the presence of hadrosaurs on the Antarctica peninsula. The remains studied were found on Vega Island and represent the southernmost known hadrosaur fossils. When the animals were still alive, this site was probably at a latitude of about 65 degrees South.
  • Horner and others studied the histology of Maiasaura peeblesorum bones. They found that Maiasaura only took 8–10 years to reach adult body size. A 7 metres (23 ft) adult Maiasaura could have an adult body mass of over 2,000 kilograms (4,400 lb) despite hatching at a length of about half a meter and with a body mass of less than a kilogram. This disparity implies a rate or growth similar to those found in modern mammals.
Artist's restoration of Olorotitan arharensis

2001

  • Horner and others published additional research on the histology of Maiasaura peeblesorum bones.

2003

Left ilium of Cedrorestes

2004

2005

2006

2007

Artist's reconstruction of an Angulomastacator skull

2008

Skeleton of Tethyshadros insularis

2009

2010s

2010

2011

2012

2013

Skull of Augustynolophus

2014

Artist's restoration of Probrachylophosaurus

2015

2016

  • Xu and others described the new genus and species Datonglong.
  • Wang and others described the new genus and species Zuoyunlong.
  • Prieto-Marquez, Erickson and Ebersole described the new genus and species Eotrachodon orientalis

2017

  • Cruzado-Caballero and Powell described the new genus and species Bonapartesaurus rionegrensis.
  • Study of corpolites by Chin, Feldmann & Tashman show hadrosaurs occasionally consumed decaying wood and crustaceans

2018

2019

2020s

2020

  • Longrich and others describe the new genus and species Ajnabia.
  • A study on the bone microstructure of Mongolian hadrosauroid dinosaurs, evaluating its implications for the knowledge of growth strategies and evolution of gigantism in hadrosauroids, is published by Słowiak et al. (2020).
  • A study on the anatomy of the tail of Tethyshadros insularis is published by Dalla Vecchia (2020).
  • Brownstein (2020) describes new fossil material of hadrosauromorphs from the Maastrichtian New Egypt Formation (New Jersey, United States), including a skeleton of a specimen which was probably a small-bodied adult hadrosauromorph from a lineage outside Hadrosauridae and fossils of juvenile hadrosauromorphs.
  • A study on pathologies affecting two hadrosaurid vertebrae from the Dinosaur Provincial Park (Alberta, Canada) is published by Rothschild et al. (2020), who consider Langerhans cell histiocytosis to be the most likely diagnosis, making it the first case of LCH recognized in a dinosaur so far.
  • A study on a set of fused hadrosaur vertebrae with fragments of a tooth of Tyrannosaurus rex scattered through the intervertebral space is published by Rothschild et al. (2020), who interpret this findings as evidence indicating that the space between the vertebrae was not occupied by intervertebral discs, but rather by an articular space similar to that in modern reptiles.
  • A study on the migratory behaviours of hadrosaurs, as indicated by strontium isotope data from hadrosaur teeth from the Late Cretaceous of Alberta (Canada), is published by Terrill, Henderson & Anderson (2020).
  • A study aiming to determine whether body size and ontogenetic age were strongly correlated in hadrosaurid dinosaurs from the Dinosaur Park Formation (Alberta, Canada), and to test the hypothesis of a rapid growth rate of hadrosaurids from the Dinosaur Park Formation relative to those from the Two Medicine Formation, is published by Wosik et al. (2020).
  • Partial forelimb of a large hadrosaurid with similarities to forelimbs of lambeosaurines is described from the Maastrichtian New Egypt Formation (New Jersey, United States) by Brownstein & Bissell (2020), who interpret this findings as evidence of the presence of a morphotype of large hadrosauromorph with elongate forelimbs in the latest Maastrichtian of eastern North America.
  • A study on the anatomy of fossils of Ugrunaaluk kuukpikensis and on the taxonomic status of this species is published by Takasaki et al. (2020), who consider Ugrunaaluk to be a junior synonym of the genus Edmontosaurus.
  • Evidence of pre-mortem traumatic injuries in multiple skeletal elements (especially in tail vertebrae) of Edmontosaurus annectens from the Lance Formation (Wyoming, United States) is presented by Siviero et al. (2020).
  • A study on the taphonomy and depositional history of an extensive Maastrichtian bonebed in the Lance Formation of eastern Wyoming dominated by fossils of Edmontosaurus annectens is published by Snyder et al. (2020).
  • A study on the interior structure of the nasal spine of Tsintaosaurus spinorhinus is published by Zhang et al. (2020).
  • Description of new fossil material of Pararhabdodon isonensis, and a study on the bone histology and life history of this taxon, is published by Serrano et al. (2020).
  • A study on the morphology and likely causes of the injuries in the holotype specimen of Parasaurolophus walkeri is published by Bertozzo et al. (2020).
  • Evidence of preservation of proteins, chromosomes and chemical markers of DNA in the cartilage of a nestling of Hypacrosaurus stebingeri from the Campanian Two Medicine Formation (Montana, United States) is presented by Bailleul et al. (2020).

2021

  • McDonald and others described the new genus and species Ornatops incantatus.
  • Santos-Cubedo and others described the new genus and species Portellsaurus sosbaynati.
  • Ramírez-Velasco and others described the new genus and species Tlatolophus galorum.
  • Kobayashi and others described the new genus and species Yamatosaurus izanagii
  • Description of the fossil material of a tyrannosauroid theropod and an early member of the family Hadrosauridae from the Upper Cretaceous Merchantville Formation (Delaware and New Jersey, United States), possibly representing new taxa, and a study on the phylogenetic affinities of these dinosaurs is published by Brownstein (2021).
  • A study on changes of diversity of dinosaurs belonging to the families Ankylosauridae, Ceratopsidae, Hadrosauridae, Dromaeosauridae, Troodontidae and Tyrannosauridae during the Late Cretaceous is published by Condamine et al. (2021), who interpret their findings as indicative of a decline of non-avian dinosaur diversity during the last 10 million years of the Cretaceous period, and attempt to determine possible causes of this decline.
  • Brown, Tanke & Hone (2021) describe a hadrosaurid bone from the Campanian Dinosaur Park Formation (Alberta, Canada) preserved with bite marks produced by a small- to medium-sized theropod dinosaur, deviating from the majority of known theropod tooth marks and indicative of a behavior similar to mammalian gnawing.
  • New fossil material of ornithischians, including remains of basal euiguanodontian and hadrosaurid ornithopods and the southernmost record of ankylosaurs from South America reported to date, is described from the Upper Cretaceous (Campanian–Maastrichtian) Chorrillo Formation (Argentina) by Rozadilla et al. (2021), who evaluate the implications of these fossils for the knowledge of the evolutionary history of ankylosaurs and hadrosaurids in South America.
  • Description of new fossil material of Tethyshadros insularis from the Villaggio del Pescatore fossil site (Italy), a study on the age of this site and on the phylogenetic affinities of T. insularis, and a reevaluation of claims about the evolution of insular dwarfism in Late Cretaceous hadrosauroids, is published by Chiarenza et al. (2021).
  • Description of new fossil material of hadrosaurids from the Upper Cretaceous Lago Colhué Huapí Formation (Argentina), and a study on the environment inhabited by these hadrosaurids and on the influence of paleoenvironmental conditions on South American hadrosaurid distribution, is published by Ibiricu et al. (2021).
  • Holland et al. (2021) describe an assemblage of late juvenile hadrosaurid specimens from the Spring Creek Bonebed (Alberta, Canada), representing the first record of lambeosaurines from the Wapiti Formation and possibly indicating that age segregation was a life history strategy among hadrosaurids.
  • Revision of the type material and a study on the phylogenetic affinities of Latirhinus uitstlani is published by Ramírez-Velasco, Espinosa-Arrubarrena & Alvarado-Ortega (2021); a study on the taphonomy of the skeletal elements in the holotype of L. uitstlani designated by the aforementioned authors, on the skeletal composition of the holotype, on the diagnostic utility of the characters used by Ramírez-Velasco, Espinosa-Arrubarrena & Alvarado-Ortega (2021) for referring other specimens to different hadrosaurid clades, and on the phylogenetic affinities of L. uitstlani is subsequently published by Serrano-Brañas & Prieto-Márquez (2021).
  • A study on the biodiversity patterns of Late Cretaceous hadrosaurids and ceratopsids from the western interior of North America, evaluating whether the fossil record provides evidence of faunal provinciality of these dinosaurs, is published by Maidment et al. (2021).

2024

See also

Footnotes

  1. ^ Horner, Weishampel, and Forster (2004); "Table 20.1: Hadrosauridae", page 443.
  2. ^ Horner, Weishampel, and Forster (2004); "Introduction", page 438.
  3. Horner, Weishampel, and Forster (2004); "Table 20.1: Hadrosauridae", pages 439–442.
  4. ^ Horner, Weishampel, and Forster (2004); "Table 20.1: Hadrosauridae", page 441.
  5. Lucas (2001); "Nemegtian Vertebrates", page 181.
  6. ^ Horner, Weishampel, and Forster (2004); "Table 20.1: Hadrosauridae", page 440.
  7. ^ Horner, Weishampel, and Forster (2004); "Paleoecology, Biogeography, and Paleobiology", page 462.
  8. Weishampel and Young (1996); "Haddonfield Hadrosaurus", page 71.
  9. ^ Horner, Weishampel, and Forster (2004); "Table 20.1: Hadrosauridae", page 442.
  10. ^ Horner, Weishampel, and Forster (2004); "Systematics and Evolution", page 457.
  11. ^ Horner, Weishampel, and Forster (2004); "Table 20.1: Hadrosauridae", page 439.
  12. Lund, E.K. and Gates, T.A. (2006). "A historical and biogeographical examination of hadrosaurian dinosaurs." pp. 263 in Lucas, S.G. and Sullivan, R.M. (eds.), Late Cretaceous vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 35.
  13. ^ Tanke (2010); "Note 4," page 544.
  14. Tanke (2010); "Note 9," page 546.
  15. ^ Horner, Weishampel, and Forster (2004); "Paleoecology, Biogeography, and Paleobiology", page 461.
  16. ^ Horner, Weishampel, and Forster (2004); "Paleoecology, Biogeography, and Paleobiology", page 463.
  17. Horner, Weishampel, and Forster (2004); "Systematics and Evolution", pages 457–458.
  18. Horner, Weishampel, and Forster (2004); "Systematics and Evolution", page 458.
  19. You et al. (2003); "Abstract", page 347.
  20. Kobayashi and Azuma (2003); "Abstract", page 166.
  21. Bolotsky and Godefroit (2004); "Abstract", page 351.
  22. Godefroit, Li, and Shang (2005); "Abstract", page 697.
  23. Prieto-Márquez et al. (2006); "Abstract", page 929.
  24. Gilpin, DiCroce and Carpenter (2007); "Abstract", page 79.
  25. Mo et al. (2007); "Abstract", page 550.
  26. Zhao et al. (2007); "Abstract", page 111.
  27. Godefroit et al. (2008); "Abstract", page 47.
  28. Wagner and Lehman (2009); "Abstract", page 605.
  29. Pereda-Suberbiola et al. (2009); "Abstract", page 559.
  30. Sues and Averianov (2009); "Abstract", page 2549.
  31. Dalla Vecchia (2009); "Abstract", page 1100.
  32. Cruzado-Caballero, Pereda-Suberbiola, and Ruiz-Omeñaca (2010); "Abstract", page 1507.
  33. Prieto-Márquez (2010); "Abstract", page 1.
  34. Juárez Valieri et al. (2010); "Abstract", page 217.
  35. Gates et al. (2011); "Abstract", page 798.
  36. Godefroit et al. (2012); "Abstract", page 335.
  37. Ramírez-Velasco et al. (2012); "Abstract", page 379.
  38. Godefroit et al. (2012); "Abstract", page 438.
  39. Coria, Riga and Casadío (2012); "Abstract", page 552.
  40. Prieto-Márquez and Brañas (2012); "Abstract", page 607.
  41. Prieto-Márquez, Chiappe, and Joshi (2012); "Abstract", page 1.
  42. Prieto-Márquez et al. (2013); "Canardia gen. nov", page 5.
  43. Bell and Brink (2013); "Abstract", page 265.
  44. Prieto-Márquez and Wagner (2013); "Abstract", page 255.
  45. Wang et al. (2013); "Abstract", page 1.
  46. Prieto-Márquez et al. (2014); "Abstract", page 1.
  47. Gates and Scheetz (2014); "Abstract", page 798.
  48. Xing et al. (2014); "Abstract", page 1.
  49. Gates et al. (2014); "Abstract", page 156.
  50. You, Li, and Dodson (2014); "Abstract", page 73.
  51. Shibata and Azuma (2015); "Abstract", page 421.
  52. Mori, Druckenmiller and Erickson (2015); "Abstract".
  53. Freedman Fowler and Horner (2015); in passim.
  54. Shibata et al. (2015); in passim.
  55. Xu et al. (2016); in passim.
  56. Wang et al. (2016); in passim.
  57. Prieto-Márquez et al. (2016); in passim.
  58. Chin, Karen; Feldmann, Rodney M.; Tashman, Jessica N. (2017). "Consumption of crustaceans by megaherbivorous dinosaurs: Dietary flexibility and dinosaur life history strategies". Scientific Reports. 7 (1): 11163. Bibcode:2017NatSR...711163C. doi:10.1038/s41598-017-11538-w. PMC 5608751. PMID 28935986.
  59. Terry A. Gates; Khishigjav Tsogtbaatar; Lindsay E. Zanno; Tsogtbaatar Chinzorig; Mahito Watabe (2018). "A new iguanodontian (Dinosauria: Ornithopoda) from the Early Cretaceous of Mongolia". PeerJ. 6: e5300. doi:10.7717/peerj.5300. PMC 6078070. PMID 30083450.
  60. Prieto-Márquez, Albert; Fondevilla, Víctor; Sellés, Albert G.; Wagner, Jonathan R.; Galobart; Àngel (2019). "Adynomosaurus arcanus, a new lambeosaurine dinosaur from the Late Cretaceous Ibero-Armorican Island of the European Archipelago". Cretaceous Research. 96: 19–37. Bibcode:2019CrRes..96...19P. doi:10.1016/j.cretres.2018.12.002. S2CID 134582286.
  61. Jialiang Zhang; Xiaolin Wang; Qiang Wang; Shunxing Jiang; Xin Cheng; Ning Li; Rui Qiu (2019). "A new saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the Upper Cretaceous of Shandong, China". Anais da Academia Brasileira de Ciências. 91 (Suppl. 2): e20160920. doi:10.1590/0001-3765201720160920. PMID 28876393.
  62. Khishigjav Tsogtbaatar; David B. Weishampel; David C. Evans; Mahito Watabe (2019). "A new hadrosauroid (Dinosauria: Ornithopoda) from the Late Cretaceous Baynshire Formation of the Gobi Desert (Mongolia)". PLOS ONE. 14 (4): e0208480. Bibcode:2019PLoSO..1408480T. doi:10.1371/journal.pone.0208480. PMC 6469754. PMID 30995236.
  63. Prieto-Márquez, Albert; Wagner, Jonathan R.; Lehman, Thomas (2019). "An unusual 'shovel-billed' dinosaur with trophic specializations from the early Campanian of Trans-Pecos Texas, and the ancestral hadrosaurian crest". Journal of Systematic Palaeontology. 18 (6): 461–498. doi:10.1080/14772019.2019.1625078. S2CID 202018197.
  64. Victoria F. Crystal; Erica S.J. Evans; Henry Fricke; Ian M. Miller; Joseph J.W. Sertich (2019). "Late Cretaceous fluvial hydrology and dinosaur behavior in southern Utah, USA: Insights from stable isotopes of biogenic carbonate". Palaeogeography, Palaeoclimatology, Palaeoecology. 516: 152–165. Bibcode:2019PPP...516..152C. doi:10.1016/j.palaeo.2018.11.022. S2CID 135118646.
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