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For the theropod, see Koreanosaurus (theropod).

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

Discovery

Skeletal diagram

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]

Description

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]

Classification

Life reconstruction

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]

References

  1. ^ Kim, J.K.; Kwon, Y.E.; Lee, S.G.; Kim, C.Y.; Kim, J.G.; Huh, M.; Lee, E.; Kim, Y.J. (2017). "Correlative microscopy of the constituents of a dinosaur rib fossil and hosting mudstone: Implications on diagenesis and fossil preservation". PLOS One. 13 (3): e0195421. doi:10.1371/journal.pone.0186600. PMC 5648225.
  2. ^ 전남대 허민 교수팀, 한국 이름명 공룡 복원. Yonhap (in Korean). 2010-11-01. Archived from the original on 2011-10-02. Retrieved 2011-05-04.
  3. ^ a b c d Min Huh; Dae-Gil Lee; Jung-Kyun Kim; Jong-Deock Lim; Pascal Godefroit (2011). "A new basal ornithopod dinosaur from the Upper Cretaceous of South Korea" (PDF). Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 259 (1): 1–24. doi:10.1127/0077-7749/2010/0102.
  4. ^ Lee G., 2008, The ornithopod dinosaur (Ornithopoda: Hypsilophodontidae) from the Late Cretaceous Seonso Conglomerate of Boseong County, Korea, Master's thesis, Chonnam National University
  5. ^ Huh, M.; Kim, J.G. (2010). "Koreanosaurus boseongensis" (in Korean). 한국고생물학회 정기총회 및 학술발표회. pp. 21–26.
  6. ^ Holtz, Thomas R. Jr. (2012). Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages (PDF). Winter 2011 Appendix
  7. ^ Fearon, J.L.; Varricchio, D.J. (2015). "Morphometric analysis of the forelimb and pectoral girdle of the Cretaceous ornithopod dinosaur Oryctodromeus cubicularis and implications for digging". Journal of Vertebrate Paleontology. 35 (4): e936555. doi:10.1080/02724634.2014.936555.
  8. ^ Han, F.-L.; Barrett, P.M.; Butler, R.J.; Xu, X. (2012). "Postcranial anatomy of Jeholosaurus shangyuanensis (Dinosauria, Ornithischia) from the Lower Cretaceous Yixian Formation of China". Journal of Vertebrate Paleontology. 32 (6): 1370–1395. doi:10.1080/02724634.2012.694385. S2CID 86754247.
  9. ^ Han, F.-L.; Forster, C.A.; Xu, X.; Clark, J.M. (2017). "Postcranial anatomy of Yinlong downsi (Dinosauria: Ceratopsia) from the Upper Jurassic Shishugou Formation of China and the phylogeny of basal ornithischians". Journal of Systematic Palaeontology. 16 (14): 1159–1187. doi:10.1080/14772019.2017.1369185. S2CID 90051025.
  10. ^ Boyd, C.A. (2015). "The systematic relationships and biogeographic history of ornithischian dinosaurs". PeerJ. 3 (e1523): e1523. doi:10.7717/peerj.1523. PMC 4690359. PMID 26713260.
  11. ^ Madzia, Daniel; Boyd, Clint A.; Mazuch, Martin (2017). "A basal ornithopod dinosaur from the Cenomanian of the Czech Republic". Journal of Systematic Palaeontology. 16 (11): 967–979. doi:10.1080/14772019.2017.1371258. S2CID 90008574.
  12. ^ Dieudonné PE, Cruzado-Caballero P, Godefroit P, Tortosa T (2020). "A new phylogeny of cerapodan dinosaurs". Historical Biology. 33 (10): 2335–2355. doi:10.1080/08912963.2020.1793979.
  13. ^ Fonseca, A. O.; Reid, I. J.; Venner, A.; Duncan, R. J.; Garcia, M. S.; Müller, R. T. (2024). "A comprehensive phylogenetic analysis on early ornithischian evolution". Journal of Systematic Palaeontology. 22 (1). 2346577. doi:10.1080/14772019.2024.2346577.
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