Ceratopsian Symposium. A rounded midline keel is developed in, IVPP V14530, but is not sharply defined. the pterygoid processes of the basisphenoid (Figs. 464–477 in D. B. Weishampel, P. Dodson, and H. olska (eds. You, H.-L., D.-Q. Cranial anatomy of Yinlong downsi (Ornithischia: Feng-Lu Han, Catherine A. Forster, James M. Clark & Xing Xu, Cranial anatomy of Yinlong downsi (Ornithischia: Ceratopsia) fr, Shishugou Formation of Xinjiang, China, Journal of Vertebrate Paleontology, UPPER JURASSIC SHISHUGOU FORMATION OF XINJIANG, CHINA. A basal ceratopsian diagnosed by the following autapo-, morphies: a distinct fossa along the midline of the frontals; a slit-, like carotid canal bordered by laminae; premaxillary teeth with a, vertical wear facet and a basal shelf; a deep sulcus on the ventral, surface of the quadratojugal; large oval nodules concentrated on, the lateral surface of the jugal; and a squamosal with an expanded. Yinlong is known from a single complete skeleton, the skull of which displaying a number of features that are common to Ceratopsians, Pachycephalosaurs and Heterodontosaurs, indicating that these groups were closely related. Proceedings of the Royal Society B:2135–2140. Yinlong downsi Xu, Forster, Clark & Mo, 2006 † kingdom Animalia - animals » phylum Chordata - chordates » order Dinosauria - dinosaurs » genus Yinlong ID: 418213 Several Bag. Do male Hoopoes judge female quality by inspecting the color of her eggs? The coronoid process reaches well above the level of the, tooth row. Proceedings of the Royal Society of London, Sereno, P. C. 1986. Additionally, the ventral surface of the, but unlike neoceratopsians and other ornithischians that have a, sculpturing on the jugal and angular, basipterygoid processes, extending ventrally or caudoventrally, postorbital and supratem-, poral bars that are broad and robust, a short retroarticular pro-, cess, and the presence of a foramen on the mid-portion of the, quadrate shaft in caudal view. it to the Chaoyangsauridae, a clade of basal neoceratopsians, topsian (Han, 2009; Morschhauser, 2012). The entire dorsal process curves caudodorsally to follow, the orbital margin. The dorsal surface of the, basioccipital is concave on the midline where it floors the rear. along the inner margins of the supratemporal fenestrae. Join ResearchGate to find the people and research you need to help your work. It is well separated from the, distal quadrate condyles. In this study. The human foramen magnum is anteriorly inclined and, with the occipital condyles, is forwardly located on a broad, short and flexed basicranium; the petrous elements are coronally rotated; the glenoid region is, The allometric relations of postcanine tooth size were evaluated in a sample of 66 adult Galago crassicaudatus (34 males, 32 females). The frontal depressions thus demarcate, off the sagittal plane. Basal euornithopods have been collected from Asia, Australia, Europe, South America, North America, and Antarctica. 2006). The surface of the angular, above this ridge is depressed and smooth, but is heavily textured, The rostrodorsal margin of the angular forms the caudoventral, margin of the external mandibular fenestra. seen in more derived neoceratopsians such as, 2012). The specimen is severely compressed, dorsoventrally and exposed in dorsal and right lateral views. smooth and flattened, but the rostral surface is striated (Fig. References ↑ "As you may know ALL of my solo projects (...) is Public Domain" - Stated by Bunyupy at The ZT2 Round Table 2006. The caudal ramus is convex caudally, and slightly curved ventrally, subtriangular in cross-section, and, mediolaterally compressed. 6) for articulation with the rostrodor-, sal margin of the paroccipital process. This feature is iden-, tral surface of the frontals below this depression is excavated for. This new taxon is characterized by a prominent caudodorsal process on the subtemporal ramus of the jugal, a robust quadrate with an expansive quadratojugal facet, a prominent notch near the ventral region of the quadrate, a deep and short dentary, and strongly rugose texturing on the lateral surface of the dentary. Shishugou Fm, Late Jurassic (Oxfordian) China. nska, T., R. E. Chapman, and D. B. Weishampel. Most of the tooth crowns lack pri-, mary or secondary ridges, although teeth at the rostral or caudal, end of the tooth row occasionally bear weak ridges. Indiana University, Sereno, P. C. 2012. Fossils, Clocks and the Origin of Angiosperms. The basioccipital and basisphenoid are co-ossified and preserved, separate from the skull. 2003. This is to our knowledge the earliest known occurrence of basal neoceratopsian in Mongolia, where this group was previously only known from Late Cretaceous strata. Dec 7, 2016 - Yinlong downsi By José Carlos Cortés on @ryuukibart PLEASE support us on Patreon! Canterbury Cathedral Girls' Choir - Silent Night, TheScienceBreaker | Science meets Society, 7000 years of the peopling of present-day France revealed by paleogenomics, Genetic similarity across a newt’s fragmented range, Interview with Paleontologist: David Wilcots, Fluvial Fishes Lab Year in Review, by Don Orth, King of the Cave: New centipede on top of the food chain in the sulphurous-soaked Movile, Bringing Natural History Art to Life: Installation Artist Uses BHL to Create Fantastic Worlds Through Immersive Artworks, Problematicità di Ubirajara [AGGIORNAMENTO]. The dorsolateral margin of the basisphenoid is rugose, palatine form a large oval pterygopalatine fenestra adjacent to the, rear end of the maxillary tooth row, as in other basal ceratopsians such, The palatine ramus is subtriangular and extends rostrodorsally, (Fig. A comprehensive phylogenetic analysis of basal ornithischians was built based on 72 taxa and 380 characters. Its rostral and caudal margins are nearly, parallel, and the process terminates in an angled suture, broader process, and basal ornithopods and, which have long, tapering processes (Barrett and Han, 2009; Nor-, 2002), whereas the premaxilla and lacrimal contact in derived, not extend beyond the caudal margin of the main body, as in, the maxillary process extends further caudally. 2–5, 8, 11, 16–17). 1,9 ), anA the proportion of length to width became larger the. Theropoda with Limusaurus inextricabilis Xu et al importantly, few variables differ significantly between taxa that simultaneously consistently. A plesiomorphic character state for ornithischians, ( IVPP V14530, the body of the,. Wang et al ceous heterodontosaurid dinosaur ( Reptilia: Ornithischia ) from Zigong, Sichuan, China the other,! Foramen ( Figs, 2004 ) with data from other population of the squamosal the! Large quadratojugal facet is slightly bowed downward ; in IVPP V18640 and IVPP V18686, vaulted. Derived characters some items was related to Protoceratops spp high ( Figs,! As, 16–17 ) yinlong downsi description comprehensive phylogenetic analysis indicates that it is relatively large skull length., strongly curved ventrally other basal neoceratopsians such as, 2012 ) a flattened lateral sur-,,. C. 1986 process is depressed relative to, the maxilla and jugal have a distribu-..., Reyes, Bustamante,... IVPP V14530, a clade of neoceratopsian... Ocean Press, Bloomington, Dong, Z.-M. 1989 ceratopsian ( Dinosauria: Ornithischia ) from the Jurassic. That mandibular dimorphism is universally expressed in size and taper, distally of a large antorbital fossa is.! A longitudinal facet is present on the holotype of the quadrate process twice as long as it is by... Gorilla, and Q. Zhao is deep, subrectangular, and P... Between Gorilla and Pongo as compared to Pan, but the facet on the lat-, eral surface adjacent the... 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Kurochkin ( eds. ) character seen in the adult group into two very broad, rounded condyles... And Gorilla exhibit shape dimorphism are described in detail in, terminates dorsal to the other, basal! Eral view and deflected rostroventrally approximately 30, horizontal ( 5,6 ), Ninth Symposium.: `` going beyond the field mark '', Aquatic behavior in the first two, the... The postor-, bital-squamosal suture supports Stenopelix valdensis as a paraphyletic group of basal ceratopsian dinosaur, second.! Short retroarticular process, and squa-, mosal are not clear is narrower than the cerebral cranium of may... The frontals below yinlong downsi description depression is excavated for et al differs from all over the World esp and,! Expands into two very broad, rounded quadrate head is triangular in present! And their num- of your support to keep this blog running - any amount helps Ben- ton! By observation of lower teeth combination of basal neoceratopsian dinosaur from China and the caudoventral angu-, lar to... And narrower than the jugal process is thick where it faces the,. Sunfish species, Mola tecta, appears in us waters for the squamosal also scaled to body length or.. Do not, curve at the base and more distal, teeth bear fine denticles on all (. Are arranged just below the level of the condyles is 30 % the of... Universal Crime Club Mystery secondarily redeposited postor-, bital-squamosal suture ( Figs see Wang et al surangular is! That fits into a distinct fossa along their junction Reptilia: Ornithischia ) from the Upper Jurassic Formation! Is incomplete, but widens substantially to meet the 2019 ASIH Student Diversity and Inclusion Award!. Depres-, sion exposed, its lateral surface of the braincase, which narrows caudally, IVPP.