A Reevaluation of the Manus Structure in Triceratops (Ceratopsia: Ceratopsidae)

  title={A Reevaluation of the Manus Structure in Triceratops (Ceratopsia: Ceratopsidae)},
  author={Shin-Ichi Fujiwara},
ABSTRACT A Triceratops, NSM PV 20379, excavated from the Upper Cretaceous Hell Creek Formation, Bowman County, North Dakota, USA, confirms the articulation of the right forearm. Detailed study of the forelimb anatomy presented here indicates the manus is in a semi-supinated orientation. This reconstruction is based upon the following morphology: the row of the metacarpals was arranged in an ‘L’-shape in proximal view, as is the distal articular surface of the forearm is in articulation; the… Expand
The postcranial skeleton of Vagaceratops irvinensis (Dinosauria, Ceratopsidae)
This study and other recent studies of ceratopsid postcrania suggest that potentially useful taxonomic variation is present in the number of dorsosacrals, size of the groove on the ventral surface of the sacrum, morphology of the last dorsal and dorsosACral ribs, and position of the fourth trochanter of the femur. Expand
New information on the rare horned dinosaur Arrhinoceratops brachyops (Ornithischia: Ceratopsidae) from the Upper Cretaceous of Alberta, Canada
Arrhinoceratops brachyops is a poorly understood chasmosaurine ceratopsid from the Upper Cretaceous Horseshoe Canyon Formation of Alberta, previously described on the basis of only a single skull.Expand
Forearm orientation in Hadrosauridae (Dinosauria: Ornithopoda) and implications for museum mounts
Skeletons of hadrosaurids (“duck-billed dinosaurs”) are usually mounted with palms facing caudally (posteriorly). To achieve this, the radius is articulated with the medial (ulnar) condyle of theExpand
Evidence for a Sauropod-Like Metacarpal Configuration in Ankylosaurian Dinosaurs
Ankylosaurian dinosaurs are armored, quadrupedal members of the ornithischian clade Thyreophora. Ankylosaurs are typically portrayed with the metacarpals slanted and distally divergent, with theirExpand
A Probable Neoceratopsian Manus Track from the Nanushuk Formation (Albian, Northern Alaska)
We report a likely neoceratopsian manus track from an exposure of the Nanushuk Formation along the Colville River in northern Alaska. The track described here containts the impressions of fiveExpand
A New Centrosaurine from the Late Cretaceous of Alberta, Canada, and the Evolution of Parietal Ornamentation in Horned Dinosaurs
In 1916, a centrosaurine dinosaur bonebed was excavated within the Campanian-aged deposits of what is now Dinosaur Provincial Park, Alberta, Canada. Specimens from this now-lost quarry, including twoExpand
A Probable Neoceratopsian Manus Track from the Nanushuk Formation (Albian, Northern Alaska) Probable pisada de Neoceratopsia en la Formación Nanushuk (Albiense, Norte de Alaska)
We report a likely neoceratopsian manus track from an exposure of the Nanushuk Formation along the Colville River in northern Alaska. The track described here contains the impressions of five digits,Expand
Evidence for a Sauropod-Like Metacarpal Configuration in Stegosaurian Dinosaurs
The stegosaurian forelimb is usually portrayed with the metacarpals slanted and distally spread. However, manual manipulation of stegosaurian metacarpals reveals that in that configuration they doExpand
An elephant-sized Late Triassic synapsid with erect limbs
The discovery of Lisowicia overturns the established picture of the Triassic megaherbivore radiation as a phenomenon restricted to dinosaurs and shows that stem-group mammals were capable of reaching body sizes that were not attained again in mammalian evolution until the latest Eocene. Expand
Shape of articular surface of crocodilian (Archosauria) elbow joints and its relevance to sauropsids
Dinosaurs and pterosaurs, phylogenetically bracketed by Crocodylia and Aves (birds), may have possessed a similar olecranon fossa and intercotylar process on their articular cartilages, which helps to determine the maximum angle of extension of the elbow joint in archosaurs. Expand


The pectoral girdle and forelimb of the basal theropod Herrerasaurus ischigualastensis
ABSTRACT New specimens of Herrerasaurus ischigualastensis shed light on the structure and function of the pectoral girdle and forelimb in early theropod dinosaurs. As in tetanurian theropods, theExpand
Appendicular myology of the hadrosaurian dinosaur Maiasaura peeblesorum from the Late Cretaceous (Campanian) of Montana
Musculature of the pectoral and pelvic appendages and girdles of adult and nestling Maiasaura peeblesorum (Dinosauria: Ornithischia: Hadrosauridae) from the Late Cretaceous of Montana is restoredExpand
Morphological evidence presented here suggests a semi-tubular manus was an exaptation that ultimately functioned as a weight-distributing structure, and that this unique morphology may have been present in basal sauropods. Expand
On the Skeleton of Iguanodon atherfieldensis sp. nov., from the Wealden Shales of Atherfield (Isle of Wight)
  • R. Hooley
  • Geology
  • Quarterly Journal of the Geological Society of London
  • 1925
I. Introduction. This very fine fossil was obtained from the débris of Wealden Shales, after a fall of the cliff near Atherfield (Isle of Wight). The complete skeleton was probably present when inExpand
Restoration of Triceratops.
IN previons numbers of this Journal, the writer has given the principal characters of the gigantic Oeratopsidw, or horned Dinosaurs, from the Laramie, with figures of the more important parts of theExpand
A half-scale model of the complete forelimb of Chasmosaurus irvinensis was fabricated to test current hypotheses of neoceratopsid forelimb stance and step cycle. Using this model in conjunction withExpand
Forelimb posture in neoceratopsian dinosaurs: implications for gait and locomotion
The articular surfaces of uncrushed ceratopsian scapulocoracoids and forelimb joints confirm that theForelimb operated in a near-parasagittal plane with the elbows only slightly averted, and the maximal running speed of even the largest ceratopsis is inferred to have significantly exceeded that of elephants and was probably broadly similar to that of rhinos. Expand
The Osteology of the Reptiles
IN no domain of zoological science have the con tributions of American naturalists been more splendid than in that of vertebrate palaeontology, and in the list of pioneer workers in this domain anExpand
A new species of Chasmosaurus (Dinosauria: Ceratopsia) from the Dinosaur Park Formation of southern Alberta
Chasmosaurus irvinensis (sp. nov.) is distinguished from other species of this genus by the possession of a broad snout, absence of a brow horn (the position of which is occupied by a pit orExpand
The mounted skeleton of Triceratops prorsus
Among the vertebrate fossils included in that part of the Marsh collection, now preserved in the United States National Museum, are the remains of several individuals pertainingto the largeExpand