Lambeosaurinae

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Lambeosaurines Temporal range: Late Cretaceous,[1] 86.3–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Skeleton of Parasaurolophus walkeri , Museum of Evolution Warsaw
Scientific classification Edit this classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Clade:	†Ornithopoda
Family:	†Hadrosauridae
Clade:	†Euhadrosauria
Subfamily:	†Lambeosaurinae Parks, 1923
Type species
†Lambeosaurus lambei Parks, 1923
Subgroups
†Amurosaurus †Aralosaurus †Canardia †Jaxartosaurus †Kazaklambia †Latirhinus †Nanningosaurus ? †Nipponosaurus †Arenysaurini Longrich et al., 2020 †Adynomosaurus ? †Ajnabia †Arenysaurus †Blasisaurus †Canardia ? †Minqaria †Pararhabdodon ? †Tsintaosaurini Prieto-Márquez et al., 2013 †Adynomosaurus ? †Pararhabdodon ? †Tsintaosaurus †Corythosauria Madzia et al., 2021 †Lambeosaurini Prieto-Márquez et al., 2013 †Amurosaurus ? †Corythosaurus †Hypacrosaurus †Lambeosaurus †Magnapaulia †Olorotitan †Sahaliyania †Velafrons †Parasaurolophini Prieto-Márquez et al., 2013 †Adelolophus †Angulomastacator ? †Charonosaurus †Parasaurolophus †Tlatolophus
Synonyms
Cheneosaurinae Lull & Wright, 1942 Stephanosaurinae Lambe, 1920 Trachodontinae? Lydekker, 1888

Lambeosaurinae /ˌlæmbiəˈsɔːraɪniː/ (meaning 'lambe's lizards') is an extinct group of crested hadrosaurid dinosaurs.

Uncertainty surrounds the size of lambeosaurs from the European continent. Hadrosaurs found there, alongside other dinosaurs, have traditionally been considered representatives of the phenomenon of insular dwarfism, as the continent was then made up of many smaller islands. Many fossil remains from the continent are smaller than those of hadrosaurs found elsewhere in the world, with only isolated remains indicating individuals of adult size by the standards of their relatives in North America and Asia. It remains possible, however, that at least some cases instead represent misidentification of juvenile remains.^{[2] [3]} The presence of genuine dwarfed taxa has been validated in some cases;^{[2] [4]} adults of the genus Minqaria , for example, are thought to be around 3.5 metres (11 ft) in length.^[5] Contrastingly, the genus Pararhabdodon has a projected adult size similar to those of hadrosaurs on other continents, and known remains of Adynomosaurus and hadrosaurs from the Basturs Poble bonebed are of this adult size themselves.^[6] Why hadrosaurs of such variable sizes co-exist, despite being subject to the same environmental pressures, remains unclear.^[4]

Lambeosaurines originated on the continent of Laurasia during the Late Cretaceous, being initially found throughout modern Europe and Asia. Around the Campanian stage, lambeosaurines of the tribe Corythosauria colonized the landmass of Laramidia (modern western North America) via Beringia and spread as far south as Mexico, radiating into a diverse array of a body plans, including famous taxa such as Parasaurolophus and Lambeosaurus . They appear to have also colonized the eastern landmass of Appalachia at some point, based on indeterminate lambeosaurine remains from the late Campanian/Maastrichtian-aged Kanguk Formation of Nunavut.^{[7] [8]}

For unknown reasons, lambeosaurines largely disappeared from North America around the Campanian/Maastrichtian boundary (the last remaining confirmed American member being Hypacrosaurus ), but continued their dominance in Laurasia up to the end of the Cretaceous, with some members such as Ajnabia and Minqaria even colonizing northern Africa from Europe. However, fragmentary remains, including a partial humerus, resembling those of lambeosaurines have been reported from the late Maastrichtian-aged New Egypt Formation of New Jersey, USA. If these are lambeosaurine remains, these specimens are unique both for representing the one of the very few records of lambeosaurines from the landmass of Appalachia (suggesting that lambeosaurines had managed to migrate eastwards to Appalachia during the Maastrichtian, following the partial closure of the Western Interior Seaway), and potentially representing one of the latest records of the group from North America.^{[7] [8]}

Lambeosaurines have been traditionally split into the tribes or clades Parasaurolophini (Parasaurolophus , Charonosaurus , others (?).) and Lambeosaurini (Corythosaurus , Hypacrosaurus , Lambeosaurus , others.).^[9] Corythosaurini (synonym of Lambeosaurini, see below) and Parasaurolophini as terms entered the formal literature in Evans and Reisz's 2007 redescription of Lambeosaurus magnicristatus. Corythosaurini was defined as all taxa more closely related to Corythosaurus casuarius than to Parasaurolophus walkeri, and Parasaurolophini as all those taxa closer to P. walkeri than to C. casuarius. In this study, Charonosaurus and Parasaurolophus are parasaurolophins, and Corythosaurus, Hypacrosaurus, Lambeosaurus, Nipponosaurus , and Olorotitan are corythosaurins.^[10] However, later researchers pointed out that due to the rules of priority set forth by the ICZN, Any tribe containing Lambeosaurus is properly named Lambeosaurini, and that therefore the name "Corythosaurini" is a junior synonym, and the definition had Corythosaurus casuarius changed to Lambeosaurus lambei, and the same for Parasaurolophini.^[11] In more recent years Tsintaosaurini (Tsintaosaurus + Pararhabdodon ) and Aralosaurini (Aralosaurus + Canardia ) have also emerged.^[12]

The following cladogram was recovered in a 2022 phylogenetic analysis by Xing Hai, and colleagues.^[13]