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The First Ceratopsian Dinosaur from South Korea

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The First Ceratopsian Dinosaur from South Korea View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by RERO DOC Digital Library Naturwissenschaften DOI 10.1007/s00114-010-0739-y ORIGINAL PAPER The first ceratopsian dinosaur from South Korea Yuong-Nam Lee & Michael J. Ryan & Yoshitsugu Kobayashi Received: 20 July 2010 /Revised: 2 November 2010 /Accepted: 2 November 2010 # Springer-Verlag 2010 Abstract In 2008, a new basal neoceratopsian was discov- Keywords Basal neoceratopsian . Koreaceratops ered in the Tando beds (Albian) of Tando Basin in South hwaseongensis . Tando beds . Late Early Cretaceous . Korea. It represents the first ceratopsian dinosaur in the Korean Hwaseong City. South Korea peninsula and is assigned to Koreaceratops hwaseongensis gen. et sp. nov. Autapomorphies of Koreaceratops include very tall neural spines over five times higher than the Introduction associated centra in the distal caudals, and a unique astragalus divided into two fossae by a prominent craniocau- Ceratopsia (horned-dinosaurs) consists of numerous basal dal ridge on the proximal surface. A phylogenetic analysis taxa and Ceratopsidae which are most easily recognized by indicates that Koreaceratops is positioned between Archae- presence of the rostral bone (You and Dodson 2004). While oceratops and all more derived neoceratopsians, and the ceratopsids comprise large-bodied, quadrupedal, herbivo- elongation of caudal neural spines was an important derived rous ornithischians typified by elongate postorbital brown character in non-ceratopsid neoceratopsians. The very tall horns and expansive shield-like frills that may have caudal neural spines in Koreaceratops, Montanoceratops, elaborate ornamentation, basal ceratopsians are small, Udanoceratops, Protoceratops,andBagaceratops appear to bipedal or quadrupedal forms (Dodson et al. 2004). be homoplasious, suggesting an independent adaptation, Ceratopsians appear to have originated in Asia with the possibly for swimming. Skeletal evidence suggests that earliest basal ceratopsian being Yinlong downsi (Xu et al. obligate quadrupedalism occurred gradually in neoceratop- 2006) from the early Late Jurassic of China. The basalmost sians progressing from bipedal through facultative quadru- neoceratopsians are confined to the Late Jurassic and Early pedalism, to complete quadrupedalism in Coronosauria. Cretaceous of China, with some psittacosaurids also being known from western Siberia, Mongolia, and possibly Communicated by Robert Reisz Thailand (Sereno 2010). By the Late Cretaceous, basal Electronic supplementary material The online version of this article neoceratopsians became common in North America and (doi:10.1007/s00114-010-0739-y) contains supplementary material, more widely distributed in Asia, especially in the Gobi which is available to authorized users. region that has produced nearly all of the Asian genera Y.-N. Lee (*) (Chinnery-Allgeier and Kirkland 2010). Ceratopsids were Korea Institute of Geoscience and Mineral Resources, confined to the Late Cretaceous (Santonian∼Maastrichtian) Daejeon, South Korea of North America until the discovery of a centrosaurine e-mail: [email protected] Sinoceratops zhuchengensis from China (Xu et al. 2010). M. J. Ryan The putative ceratopsid, Turanoceratops, is also known Cleveland Museum of Natural History, from the Turonian of Uzbekistan (Farke et al. 2009; Ryan Cleveland, USA 2009; Sues and Averianov 2009a, b). In 2008, a new basal ceratopsian was discovered in Y. Kobayashi Hokkaido University Museum, the Tando beds (Lower Cretaceous) of Tando Basin in Hokkaido, Japan Korea (Fig. 1). It represents the first ceratopsian dinosaur Naturwissenschaften Fig. 1 Regional geologic map in the vicinity of the Tando Basin metamorphic and Mesozoic plutonic rocks, deposited mainly in the (modified after Park and Kim 1972; Kim et al. 2009). The Tando fault-bounded basin beds are uncomfortably underlain by the basement of Precambrian from the Korean peninsula. This new basal ceratopsian is Etymology The genus and species are named after Korea and not only an important contribution to the growing Hwaseong City, respectively, which yielded the holotype. database of basal ceratopsians in Asia, but it is also an important datum for the paleogeographic distribution of Holotype KIGAM VP (Korea Institute of Geoscience and this group since it represents the easternmost occurrence Mineral Resources, Vertebrate Paleontology, Daejeon) of the group in Eurasia (contra Lucas 2006;see 200801, a nearly complete tail with both ischia, partial Kobayashi 2006). It also comes from a time period distal hind limbs and feet (Figs. 2 and 3). (Albian) with a very limited fossil record for basal neoceratopsians. The Korean ceratopsian is of particular interest because it has very long caudal neural spines which are comparable to those of some Late Cretaceous basal ceratopsian taxa such as Protoceratops, Bagacera- tops, Udanoceratops,andMontanoceratops. The purpose of this paper is to describe the new basal ceratopsian from theTandobeds,HwaseongCityinKoreaandtocompare it with other basal ceratopsians to establish its phylogenetic position. Systematic paleontology Dinosauria Owen 1842 Ornithischia Seeley 1888 Ceratopsia Marsh 1890 Fig. 2 K. hwaseongensis, gen. et sp. nov., from the Tando beds Neoceratopsia Sereno 1986 (Albian) of Tando Basin in South Korea (KIGAM VP 200801, Koreaceratops hwaseongensis, gen. et sp. nov. holotype) in ventral view. The proximal tibiae and fibulae are sharply cut off at the edge of the block Naturwissenschaften Fig. 3 Illustrations of K. hwaseongensis, gen. et sp. nov., with prezygapophysis, T tibia, t tarsal, tr transverse process, ug ungual. anatomical abbreviations: ast astragalus, ca calcaneum, cv caudal Cross-hatch pattern indicates broken edge of bone and partial vertebra, Fi fibula, isc ischium, mt metatarsal, ns neural spine, pr restorations of neural spines are shown with dotted lines Type locality and geological setting The Tando Basin is a thermal alternation of the sediments by volcanic activities very small basin (approximately 25 km2) located in mid- in this area (Yi et al. 2004). K–Ar plagioclase and biotite west Korea (Fig. 1). This terrestrial Cretaceous sedimentary age of three andesitic tuff samples from the upper section of basinwasfoundin1972(ParkandKim1972)and the Tando beds is 103±0.5 Ma indicating that the Tando officially named as the Tando Basin by Park et al. (2000). beds are late Early Cretaceous in age (Albian). The basin is mainly filled with clastic sediments, which consists of predominantly purple, fine-grained sandstones Diagnosis Very tall neural spines over five times higher than and siltstones, and thin sandstones with thick conglomeratic the associated centra in the distal portion of the caudal vertebrae sandstones in the lower part, and well-bedded tuffaceous except for caudalmost caudals; surface of astragalus capping rocks and cherty mudstones in the upper part. Although we the distal end of the tibia divided into two fossae by a prominent regard these deposits as deserving of formational status, craniocaudal ridge; triangular-shaped calcaneum is 1.5 times they are referred to here as the Tando beds, pending a full longer craniocaudally than the astragalus in proximal view. description and establishment of a type section. The Tando beds crop out on several small islands in the basin such as Description KIGAM VP 200801 consists of the nearly Tando, Buldo, Ttakseum, Goryeom, and Seoksan islands. articulated, partial hind limbs and tail of a small basal KIGAM VP 200801 was found in a block of rock in the neoceratopsian. The proximal tibiae and fibulae are sharply rock-filled Tando embankment dam between the Tando cut off at the edge of the block (Fig. 2), suggesting that the rest dock and the Jeongok harbor by a public official of of the skeleton could have been present before the block was Hwaseong City in 2008. The block (80 cm×60 cm× broken up in the quarry, but this cannot now be determined. 80 cm) containing the bones is composed of reddish, fine- Preserved elements are the caudal vertebrae, ischia, tibiae, grained sandstone (Fig. 2). The Tando embankment dam fibulae, tarsals, metatarsals, and phalanges (Fig. 3) and the was built in 1994 with rocks taken both from the Tando and measurements of each bone are given in Online Resource 1. Buldo quarries. Based on the lithology of rocks from these The specimen preserves a nearly complete tail of 36 abandoned quarries, it is believed that the source rock of the vertebrae. Possibly four or five vertebrae are missing from block containing the specimen was originally from the the posterior end of the caudal series, but the delicate lower part of the Tando beds. Six ornithopod tracks were terminal distal caudals are preserved detached from the rest previously reported from the tuffaceous sandstone and of the tail. The estimated length of the tail is approximately cherty mudstone in the upper layers of the Tando beds 813 mm. The articular surfaces of the centra of the caudal (Choe et al. 2001). Fossil palynomorphs for age determi- vertebrae are sub-rounded, decreasing in all dimensions nation could not be acquired because of the oxidation and caudally. They are spool-shaped in lateral view and tightly Naturwissenschaften articulated to each other except for the detached distal end. Both ischial shafts are preserved, although lacking proxi- Each centrum of the main portion of the tail has two well- mal ends. Each shaft is 195 mm long, as preserved, and developed chevron facets on the caudoventral
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