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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.
FIGURE 3 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 3. Nasals of NHMUK R4948, Chasmosaurus belli in A–B, right lateral, C–D, left lateral, and E–F, dorsal view. Abbreviations: nhc, nasal horn core; n-pm f, premaxillary facet on nasal; n-pm p, premaxillary process of nasal. Diagonal lines indicate broken bone. Scale bars equal to 20 cm.
FIGURE 11 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 11. Braincase of NHMUK R4948, Chasmosaurus belli in A, dorsal, B, ventral, C, right lateral, D, left lateral and E, posterior view. Scale bar equals 10 cm.
FIGURE 1 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 1. Rostral and premaxillae of NHMUK R4948, Chasmosaurus belli in A–B, right lateral, C–D, left lateral, and E–F, dorsal view. Abbreviations: pm dp, premaxillary dorsal process; pm f, premaxillary fenestra; pm fl, premaxillary flange extending into external naris; pm-m f, maxillary facet on premaxilla; pm-n f, nasal facet on premaxilla; pm sf, small foramen ventral to premaxillary fenestra on premaxilla; r, rostral; r dp, dorsal process of rostral; r pp, posterior process of rostral. Diagonal lines indicate broken bone. Scale bars equal to 20 cm.
FIGURE 25 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 25. Right femur of NHMUK R4948, Chasmosaurus belli, in A, anterior, B, posterior, C, lateral, D, medial, E, dorsal and F, ventral view. Abbreviations: 4t, fourth trochanter; at, anterior trochanter; gt, greater trochanter; hd, femoral head. Scale bar equals 20 cm for A–D, 15 cm for E–F.
FIGURE 2 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 2. Maxillae of NHMUK R4948, Chasmosaurus belli. A–D, right maxilla in A, C, lateral, and B, D, medial view; E– H, left maxilla in E, G, lateral, and F, H, medial view. Abbreviations: aof, antorbital fossa; m-ecpt f, ectopterygoid facet on maxilla; m-la-j f, lacrimal and jugal facets on maxilla; m mf, medial foramen on maxilla; m-n f, nasal facet on maxilla; m-pm f, premaxillary facet on maxilla; m-pt f, pterygoid facet on maxilla; m r, maxillary ridge. Diagonal lines indicate broken bone. Scale bars equal to 20 cm.
FIGURE 16 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 16. Syncervical of NHMUK R4948, Chasmosaurus belli in A, right lateral and B, left lateral view. Abbreviations: III, cervical three; III dia, diapophysis of cervical three; III ns, neural spine of cervical three; III para, parapophysis of cervical three; at, atlas; at rf, atlas rib facet; ax, axis; ax dia, diapophysis of axis; ax na, neural arch of axis; ax ns, neural spine of axis; ax para, parapophysis of axis. Scale bar equals 20 cm.
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Allen Brain Atlas
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