Kritosaurini

Kritosaurins
Temporal range: 83–66 Ma
Gryposaurus notabilis skeleton at the Royal Ontario Museum
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Ornithischia
Clade: Ornithopoda
Family: Hadrosauridae
Subfamily: Saurolophinae
Tribe: Kritosaurini
Lapparent & Lavocat, 1955
Type species
Kritosaurus navajovius
Subtaxa
Synonyms
  • Gryposaurini Holtz, 2007

Kritosaurini is a tribe of saurolophine hadrosaurid dinosaurs from the Late Cretaceous.

Discovery and naming

The first member of the group discovered and named was Kritosaurus; it was named by paleontologist Barnum Brown in 1910. Four years later, Canadian paleontologist Lawrence Lambe would name Gryposaurus. The similarity between the two taxa was immediately recognized, and throughout the twentieth century the validity of the latter genus was doubted, with it being suggested both species were the same. Only in the 1990s were they definitively identified as distinct. Around this time, related hadrosaurs Naashoibitosaurus and Secernosaurus were discovered, and the modern interpretation of the group started to develop.

The name "Kritosaurini" was first mentioned in 1955 by Lapparent & Lavocat, where they mentioned "‘Kritosaurinés" as a group of hadrosaurids containing only Kritosaurus, which was thought of as a senior synonym of Gryposaurus. In 1989, Michael Brett-Surman proposed the name Kritosaurini as a tribe of hadrosaurines that contained Aralosaurus, Brachylophosaurus, Hadrosaurus, Lambeosaurinae, Saurolophinae, and Kritosaurus (including Gryposaurus). It was not until 2014 that Albert Prieto-Márquez officially defined and diagnosed Kritosaurini as the most exclusive clade of hadrosaurids containing Kritosaurus navajovius, Gryposaurus notabilis, and Naashoibitosaurus ostromi.

In 2022, Rozadilla et al. described Huallasaurus and Kelumapusaura, two new genera similar to kritosaurins. In their study, they analyzed the relationships of the Kritosaurini and Hadrosauridae as a whole. In a study the following year, Alarcón-Muñoz et al. implemented an updated version of the phylogenetic matrix of Rozadilla et al, proposing the name Austrokritosauria for the clade of entirely South American saurolophines closely related to kritosaurins. The results of their phylogenetic analyses of Saurolophinae are displayed in the cladogram below.

Saurolophinae

Wulagasaurus

Acristavus

Maiasaura

Probrachylophosaurus

Brachylophosaurus

Austrokritosauria

Secernosaurus

Bonapartesaurus

Kelumapusaura

Huallasaurus

Kritosaurini

Kritosaurus

Rhinorex

Gryposaurus latidens

Gryposaurus notabilis

Gryposaurus monumentensis

Kamuysaurus

Prosaurolophus

Saurolophus osborni

Saurolophus angustirostris

Laiyangosaurus

Kerberosaurus

Shantungosaurus

Edmontosaurus regalis

Edmontosaurus annectens

See also


This page was last updated at 2023-11-02 05:22 UTC. Update now. View original page.

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