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43 results for “Ceratopsidae”
Figure 6 in The record of Torosaurus (Ornithischia: Ceratopsidae) in Canada and its taxonomic implications
Figure 6. Osteohistology of Torosaurus cf. T. latus (EM P16.1). A, thin section of cortical bone of left femoral diaphysis ('B9- 3') (red bounding boxes indicate details in B); B, details of A, showing poorly vascularized periosteum (left) and deep cortex (right). Arrow indicates possible line of arrested growth. Note the lack of a discernible 'External Fundamental System' in B. Further imagery available at links in Appendix 2.
Figure 3 in The record of Torosaurus (Ornithischia: Ceratopsidae) in Canada and its taxonomic implications
Figure 3. Squamosals attributable to Torosaurus. A, EM P16.1; B, MPM VP6841; C, YPM 1830, holotype of T. latus (mirrored left squamosal). Note that EM P16.1 and MPM VP6841 share a wide squamosal blade, broadly rounded caudolateral corner (indicated by arrows) and a large fenestra within the blade. Squamosals scaled to same length to emphasize shape differences. Image in B provided by R. Hunt-Foster and image in C provided by A. Farke (used with permission).
Figure 2 in The record of Torosaurus (Ornithischia: Ceratopsidae) in Canada and its taxonomic implications
Figure 2. Parietosquamosal frill of Torosaurus cf. T. latus (EM P16.1.). A, dorsal surface; B, interpretive reconstruction of dorsal surface; C, schematic transverse cross-section of squamosal near caudal edge, based on sketch by H. Jones; D, schematic of frill, showing paired fossae and channels on ventral surface of squamosals, based on sketch by H. Jones. Abbreviations: p, parietal; pf, parietal fenestra; sq, squamosal; sqaf, accessory fenestra of squamosal; sqb, squamosal bar.
Figure 1 in The record of Torosaurus (Ornithischia: Ceratopsidae) in Canada and its taxonomic implications
Figure 1. Locality information pertinent to Canadian Torosaurus specimens. A, map (created using https://www. simplemappr.net/) showing locations of EM P16.1 and UALVP 1646 (stars). B, stratigraphic context of EM P16.1 and UALVP 1646, with distribution of Hell Creek Formation Torosaurus for context. Note that the precise placement of EM P16.1 within the Frenchman Formation is unknown. The precise location of MPM VP6841 within the upper Hell Creek Formation is likewise uncertain. Abbreviations: Fm, Formation; K-Pg, Cretaceous-Palaeogene boundary; Mtn, Mountain.
Figure 7 in The record of Torosaurus (Ornithischia: Ceratopsidae) in Canada and its taxonomic implications
Figure 7. Parietal of Torosaurus cf. T. latus (UALVP 1646). A, dorsal surface; B, interpretive reconstruction of dorsal surface; C, ventral surface; D, interpretive reconstruction ventral surface; E, detail of left parietal fenestra. Arrows in B and D indicate epiparietal loci. Arrows in E indicate unbroken margin of parietal fenestra. Abbreviations: mb, median bump; pf, parietal fenestra; pfo, parietal fossa.
Figure 5 in The record of Torosaurus (Ornithischia: Ceratopsidae) in Canada and its taxonomic implications
Figure 5. Osteohistology of Torosaurus cf. T. latus (EM P16.1). A, thin section of trabecular bone of left femoral metaphysis ('B9-2A') (red bounding box indicates detail in B); B, detail of A, showing large, subcircular erosion bays and dense, Haversian tissue; C, thin section of cortical bone of left femoral metaphysis ('B9-2B'), sampled immediately adjacent and superficial to A (red bounding box indicates detail in D); D, detail of C, showing periosteum. Arrows indicate lines of arrested growth. Note the lack of a discernible 'External Fundamental System' in D. Further imagery available at links in Appendix 2.
FIGURE 23 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 23. Humeri of NHMUK R4948, Chasmosaurus belli. A–D, right humerus in A, anterior, B, posterior, C, lateral and D, medial view. E–J, left humerus in E, anterior, F, posterior, G, lateral, H, medial, I, dorsal and J, ventral view. In I and J, anterior is towards the top of the figure. Abbreviations: dpc, deltopectoral crest; g, groove separating area of attachment of m. pectoralis from m. deltoideus clavicularis and scapularis; hd, humeral head; n, notch on dorsal surface separating medial tuberosity; str, striations; tf, triceps fossa; see text for details. Scale bar equals 10 cm for A–H and 5 cm for I and J.
FIGURE 22 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 22. Preserved pectoral and pelvic girdle elements of NHMUK R4948, Chasmosaurus belli. A–D, coracoid in A, right lateral, B, right medial, C, left lateral and D, left medial view. E–G, proximal plate of left scapula in E, lateral, F, medial and G, anterior view. H–K, partial right pubis in H, lateral, I, medial, J, dorsal and K, ventral view. The anterior portion of the prepubis is preserved separately and shown in its approximate location with respect to the rest of the pubis in J and K. Abbreviations: ace, acetabular part of the pubis; acr, acromial process; can, canal; cor s, surface for coracoid; gle, glenoid; pop, postpubis; prp, prepubis; scc, area of attachment of the m. supracoracoideus; sp, sternal process. Scale bar equals 10 cm.
FIGURE 21 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 21. Examples of the dorsal ribs of NHMUK R4948, Chasmosaurus belli, in A–B, anterior and C–D, posterior view. Location of ribs on the dorsal column unknown. Scale bar equals 20 cm.
FIGURE 26 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 26. Right tibia and fibula of NHMUK R4948, Chasmosaurus belli. A–D, tibia in A, lateral, B, medial, C, dorsal and D, ventral view. E–F, fibula in E, lateral and F, medial view. Abbreviations: cc, cnemial crest; fc, fibular condyle; ifb, attachment area for m. iliofibularis. Scale bars equal 10 cm.
FIGURE 20 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 20. Sacral vertebrae of NHMUK R4948, Chasmosaurus belli in A, dorsal, B, right lateral and C, left lateral view. Abbreviations: ds1, first dorsosacral vertebra; ds2, second dorsosacral vertebra; s1, first sacral vertebra; s2, second sacral vertebra; s3, third sacral vertebra; s4, fourth sacral vertebra. Scale bar equals 10 cm.
FIGURE 17 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 17. Cervical vertebrae four to eight of NHMUK R4948, Chasmosaurus belli. A–C, cervical four; D–F, cervical five; G–I, cervical six; J–L, cervical seven; M–O, and cervical eight; shown in A, D, G, J, M, anterior, B, E, H, K, N, posterior and C, F, I, L, O, right lateral view. Scale bar equals 5 cm.
FIGURE 13 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 13. Predentary of NHMUK R4948, Chasmosaurus belli in A, dorsal, B, ventral and C, right lateral view. Scale bar equal to 10 cm.
FIGURE 9 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 9. Parietal of NHMUK R4948, Chasmosaurus belli, which is preserved in six parts. A–B, dorsal view; C–D, ventral view. Abbreviations: lb, lateral bar; mb, median bar; mp, median platform; pb, posterior bar; sq f, facet for the squamosal. Hatching indicates broken bone. Scale bar equals 20 cm.
FIGURE 10 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 10. Comparison of parietal posterior bar and eqiparietal morphology in specimens referred to Chasmosaurus. A–C, Chasmosaurus belli; D–E, Chasmosaurus russelli. A, ROM 843 in dorsal view; B, CMN 2245 in dorsolateral view; C, NHMUK R4948 in dorsal view; D, CMN 2280 in dorsal view; E, TMP 1983.25.01 (the holotype of 'Mojoceratops') in dorsal view. Not to scale.
FIGURE 5 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 5. Left postorbital and jugal of R4948, Chasmosaurus belli. A–D, postorbital in A, C, lateral and B, D, medial view; E–H, jugal in E, G, lateral and F, H, medial view. Abbreviations: epj, epijugal; fpf, margin of the frontoparietal fontanelle; j, jugal; j-ma f, maxillary facet on jugal; j-qj f, quadratojugal facet on jugal; la-j r, ridge between lacrimal and jugal; orb, orbit; po-f f, frontal facet on postorbital; po-lsp f, laterosphenoid facet on postorbital; po-pso f, posterior supraorbital facet on postorbital. Diagonal lines indicate broken bone. Scale bars equal to 20 cm.
FIGURE 15 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 15. Preserved right lower jaw elements of NHMUK R4948, Chasmosaurus belli in A–B, lateral, C–D, medial, E–F, dorsal, G–H, ventral and I–J, posterior view. Abbreviations: add, adductor fossa; ar, articular; for, foramen; gle, glenoid fossa; par, prearticular; sa, surangular; sa-a f, facet for angular on surangular. Hatching indicates broken bone. Scale bar equals 5.
FIGURE 8 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 8. Squamosals of NHMUK R4948, Chasmosaurus belli. A–D, right squamosal in A–B, lateral and C–D, medial view; E–F, left squamosal in medial view. Because of the delicate condition of the left squamosal, it could not be turned for photography in lateral view at the time of writing. Abbreviations: episq, episquamosals; sq-pa f, parietal facet on the squamosal; sq-po s, suture with the postorbital; sq-poc f, paroccipital process facet on the squamosal; sq-q f, quadrate facet on the squamosal. Hatching indicates broken bone. Scale bar equals 20 cm.
FIGURE 7 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 7. Quadrates of NHMUK R4948, Chasmosaurus belli. A–B, E–F, right quadrate in A, E, anterior and B, F, posterior view; C–D, G–H, left quadrate in C, G, anterior and D, H, posterior view. Abbreviations: q-poc f, paroccipital process facet on quadrate; q-pt f, pterygoid facet on quadrate; q-pt p, pterygoid process of quadrate; q-qj f, quadrotojugal facet on quadrate; qsq f, squamosal facet on quadrate. Scale bar equal to 5 cm.
FIGURE 4 in A new specimen of Chasmosaurus belli (Ornithischia: Ceratopsidae), a revision of the genus, and the utility of postcrania in the taxonomy and systematics of ceratopsid dinosaurs
FIGURE 4. Right circumorbital region of NHMUK R4948, Chasmosaurus belli in A, C lateral, and B, D, medial view. Abbreviations: aso, anterior supraorbital; epj, epijugal; j, jugal; j-ma f, maxillary facet on jugal; j-qj f, quadratojugal facet on jugal; la-j r, ridge between lacrimal and jugal; ltf, lateral temporal fenestra; orb, orbit; po-p f, parietal facet on postorbital; po-sq f, squamosal facet on postorbital; sohc, supraorbital horn core. Diagonal lines indicate broken bone. Scale bar equal to 20 cm.
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