Koreanosaurus

Koreanosaurus Temporal range: Campanian, 81 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ [1]
Fossil holotype
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Clade:	†Neornithischia
Family:	†Thescelosauridae
Subfamily:	†Orodrominae
Genus:	†Koreanosaurus Huh et al., 2011
Species:	†K. boseongensis
Binomial name
†Koreanosaurus boseongensis Huh et al., 2011

Koreanosaurus (lit. 'Korean lizard') is a genus of orodromine neornithischian dinosaur. One species has been described, Koreanosaurus boseongensis.

In 2003, three specimens of Koreanosaurus were found in the Late Cretaceous-age Seonso Conglomerate from the southern coast of the Bibong-ri dinosaur egg site, Boseong, Korean Peninsula.^[2] These specimens include the holotype KDRC-BB2, a partial upper skeleton lacking the skull, and two additional specimens which contains portions of the pelvic girdle and lower leg (KDRC-BB1 and KDRC-BB3).^[3] The type species was named after its locality (Boseong site 5). This taxon was initially named and described in a master's thesis by Dae-Gil Lee in 2008,^[4] and was officially published by Min Huh, Dae-Gil Lee, Jung-Kyun Kim, Jong-Deock Lim and Pascal Godefroit in 2011.^[3]

Koreanosaurus was a relatively small dinosaur, reaching 2–2.4 meters (6.6–7.9 ft) in body length.^[5][6] Based on its taxonomic position and the existence of small burrows from the Seonso Conglomerate, Koreanosaurus is likely a burrowing dinosaur.^[3] Unlike its orodromine relatives, Koreanosaurus is assumed to have been a quadruped.^[7]

Koreanosaurus was considered to be a basal member of the Ornithopoda by the authors, forming a clade with Zephyrosaurus schaffi, Orodromeus makelai and Oryctodromeus cubicularis from which they deduced a burrowing lifestyle.^[3] In 2012, Han et al. found it plausible that Koreanosaurus might be a member of Jeholosauridae or closely related to it.^[8] Subsequent phylogenetic analyses by researchers including Han et al. consistently classified Koreanosaurus as a member of Thescelosauridae,^[9] specifically within the subfamily Orodrominae.^{[10][11][12][13]}