Thescelosauridae

Thescelosauridae is a clade of neornithischians from the Cretaceous of Asia, North America and possibly South America. The group was originally used as a name by Charles M. Sternberg in 1937, but was not formally defined until 2013, where it was used by Brown and colleagues as the group uniting Thescelosaurus and Orodromeus, based on their phylogenetic results. During a phylogenetic revision of neornithischians by Clint Boyd in 2015, the authorship of Thescelosauridae was given to Brown and colleagues, which meant that the similar name Parksosauridae, informally defined in 2002 by Buchholz, would have had priority over Thescelosauridae. The two clades had slightly different definitions, with Parksosauridae referring to all animals closer to Parksosaurus than Hypsilophodon, but they contained the same taxa so Boyd used Parksosauridae under the assumption it had priority. However, in formalizing the clade following the regulations of the PhyloCode, Madzia, Boyd, and colleagues identified in 2021 that Sternberg was the proper authority for Thescelosauridae, giving it priority over Parksosauridae. As well, they gave Thescelosauridae the definition of the largest clade containing Thescelosaurus neglectus but not Iguanodon bernissartensis, as long as Hypsilophodon foxii was not in the group, modifying previous definitions for Thescelosauridae in order to maintain its modern use, so that the clade was not applied if Thescelosaurus fell within Hypsilophodontidae, a family that has not been recently used but may be revived if the systematic position of Hypsilophodon was solidified at some point in the future. Madzia et al. identified the analysis of Madzia et al. in 2018 as the reference analysis for the name Thescelosauridae, an analysis based on a revised version of the 2015 Boyd analysis.

Neornithischia

Lesothosaurus

Agilisaurus

Hexinlusaurus

Yandusaurus

Kulindadromeus

Jeholosauridae

Jeholosaurus

Yueosaurus

Nanosaurus

Hypsilophodon

Cerapoda

Thescelosauridae
Thescelosaurinae

Notohypsilophodon

Parksosaurus

Thescelosaurus assiniboiensis

Thescelosaurus garbanii

Thescelosaurus neglectus

Orodrominae

Haya

Changchunsaurus

Koreanosaurus

Oryctodromeus

Albertadromeus

Kaiparowits orodromine

Orodromeus

Zephyrosaurus

Thescelosaurids
Temporal range: EarlyLate Cretaceous,
Mounted specimen of Thescelosaurus, Burpee Museum of Natural History
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Ornithischia
Clade: Neornithischia
Family: Thescelosauridae
Sternberg, 1937
Subfamilies
Synonyms
  • Parksosauridae Buchholtz, 2002
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