''Koreaceratops'' () is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

of basal

ceratopsia Ceratopsia or Ceratopia ( or ; Greek: "horned faces") is a group of herbivorous, beaked dinosaurs that thrived in what are now North America, Europe, and Asia, during the Cretaceous Period, although ancestral forms lived earlier, in the Jurass ...

dinosaur Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is t ...

discovered in

Albian The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch/ Series. Its approximate time range is 113.0 ± 1.0 Ma to 100.5 ± 0 ...

-age

Lower Cretaceous Lower may refer to: * Lower (surname) * Lower Township, New Jersey *Lower Receiver (firearms) * Lower Wick Gloucestershire, England See also *Nizhny Nizhny (russian: Ни́жний; masculine), Nizhnyaya (; feminine), or Nizhneye (russian: Н� ...

rocks of

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korea, Korean Peninsula and sharing a Korean Demilitarized Zone, land border with North Korea. Its western border is formed ...

Discovery

Koreaceratops skeletal drawing (PARK & SON, 2022)

It is based on KIGAM VP 200801, an articulated series of 36

caudal Caudal may refer to: Anatomy * Caudal (anatomical term) (from Latin ''cauda''; tail), used to describe how close something is to the trailing end of an organism * Caudal artery, the portion of the dorsal aorta of a vertebrate that passes into the ...

vertebra The spinal column, a defining synapomorphy shared by nearly all vertebrates, Hagfish are believed to have secondarily lost their spinal column is a moderately flexible series of vertebrae (singular vertebra), each constituting a characteristi ...

e associated with partial hind limbs and

ischia Ischia ( , , ) is a volcanic island in the Tyrrhenian Sea. It lies at the northern end of the Gulf of Naples, about from Naples. It is the largest of the Phlegrean Islands. Roughly trapezoidal in shape, it measures approximately east to ...

. This specimen was found in a

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicat ...

block that had been incorporated into the Tando dam at

Hwaseong City Hwaseong () is a city in Gyeonggi Province, South Korea. It has the largest area of farmland of any city or county in Gyeonggi Province. Seoul Subway Line 1 passes through Hwaseong, stopping at Byeongjeom Station. Suin Bundang Line also passes ...

; the way the specimen is cut off suggests that more of it was present before quarrying. The dam was built in 1994, and the bones were first brought to the attention of paleontologists in 2008, after a public official noticed them. The specimen came from the Sihwa Formation. ''Koreaceratops'' was described by Yuong-Nam Lee and colleagues in

2011 File:2011 Events Collage.png, From top left, clockwise: a protester partaking in Occupy Wall Street heralds the beginning of the Occupy movement; protests against Libyan dictator Muammar Gaddafi, who was killed that October; a young man celebrates ...

. The genus name is a combination of "Korea" and the

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

''κέρας'' (''keras'') meaning 'horn' and ''ὄψις'' (''opsis'') meaning 'face'. The

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specim ...

is ''K. hwaseongensis'', named after Hwaseong City.

Classification

''Koreaceratops'' is notable for the tall

neural spines The spinal column, a defining synapomorphy shared by nearly all vertebrates,Hagfish are believed to have secondarily lost their spinal column is a moderately flexible series of vertebrae (singular vertebra), each constituting a characteristic i ...

on its caudal vertebrae, and for the structure of its

astragalus ''Astragalus'' is a large genus of over 3,000 species of herbs and small shrubs, belonging to the legume family Fabaceae and the subfamily Faboideae. It is the largest genus of plants in terms of described species. The genus is native to tempe ...

. In some of the

distal Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position pro ...

caudal vertebrae, the neural spines are over five times the height of the vertebral centra to which they attach. Lee ''et al''. noted that several other ceratopsians also had tall neural spines on their caudals. As this trait appears in several branches of ceratopsians, Lee ''et al.'' postulated that the feature was independently evolved, perhaps as an adaptation for swimming. Lee ''et al.'' performed a

phylogenetic analysis In biology, phylogenetics (; from Greek φυλή/ φῦλον [] "tribe, clan, race", and wikt:γενετικός, γενετικός [] "origin, source, birth") is the study of the evolutionary history and relationships among or within groups o ...

and found ''Koreaceratops'' to be positioned between ''

Archaeoceratops ''Archaeoceratops'', meaning "ancient horned face", is a genus of basal neoceratopsian dinosaur from the Early Cretaceous (Aptian stage) of north central China. It appears to have been bipedal and quite small, reaching in length and in body ...

'' and more

derived Derive may refer to: *Derive (computer algebra system), a commercial system made by Texas Instruments * ''Dérive'' (magazine), an Austrian science magazine on urbanism *Dérive, a psychogeographical concept See also * *Derivation (disambiguation ...

ceratopsians. A 2022 study however, suggests it is closer to '' Protoceratops'' than to earlier animals like '' Psittacosaurus'' and ''Archaeoceratops''. Koreaceratops NT

Paleobiology

An examination of the bone histology of ''Koreaceratops'' published in 2022 suggests that the type specimen was roughly eight years old when it died. The same study suggests that ''Koreaceratops'' lived in a semiarid environment, and that microbial erosion is responsible for the poor preservation of its distinguishing features. Thomas Holtz gave a length estimate of and a mass estimate as that of a beaver.

References

Neoceratopsians Early Cretaceous dinosaurs of Asia Albian life Fossil taxa described in 2011 Ornithischian genera {{ceratopsian-stub