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114 results for “Hadrosaurid”
Data from: The 'duck-billed' dinosaurs of Careless Creek (Upper Cretaceous of Montana, USA), with comments on hadrosaurid ontogeny
The Careless Creek Quarry (CCQ) is a multitaxic bonebed in the Campanian Judith River Formation of south-central Montana (USA) that produced a diverse assemblage of vertebrates, including several dinosaurian clades. We describe the morphology of the CCQ hadrosaurid material and reevaluate its taxonomic affinities. Our osteological comparative observations, coupled with maximum parsimony phylogenetic analyses, indicate that the majority of the hadrosaurid material is referable to kritosaurin saurolophines. Only an ischium is unambiguously referable to Lambeosaurinae. Most of the kritosaurin specimens likely represent a taxon that forms a polytomy with species of Gryposaurus and Rhinorex condrupus Gates and Sheetz, 2015. This form may represent individuals of either G. latidens Horner, 1992 or G. notabilis Lambe, 1914, or a new species cogeneric or not with Gryposaurus. The juvenile material exemplifies several patterns of mandibular and appendicular osteological variation previously observed in other hadrosaurids. However, it also shows some departures from the common trends, supporting the fact that not all skeletal growth changes can be generalized to all hadrosaurids.
Figure 6 in Global historical biogeography of hadrosaurid dinosaurs
Figure 6. Distribution of the main hadrosaurid clades discussed in the text on a paleogeographic reconstruction of continental coastlines during the Campanian. Continental paleocoastlines redrawn after Smith et al. (1994), Hay et al. (1999), Blakey (2001), Pough et al. (2004), and Hedges (2006).
Figure 5 in Global historical biogeography of hadrosaurid dinosaurs
Figure 5. Distribution of the main hadrosaurid clades discussed in the text on a paleogeographic reconstruction of continental coastlines during the Santonian. Continental paleocoastlines redrawn after Smith, Smith & Funnell (1994), Hay et al. (1999), Blakey (2001), Pough et al. (2004), and Hedges (2006). The partial skull depicted to represent basal lambeosaurines is that of Jaxartosaurus ararlensis.
Figure 4 in Global historical biogeography of hadrosaurid dinosaurs
Figure 4. Time-calibrated phylogram of Lambeosaurinae based on the reduced strict consensus tree of Prieto-Márquez (2010). Letters at each node represent ancestral areas as inferred in the DIVA analysis; their meaning is as in Fig. 1. The colors of the stratigraphic ranges of taxa indicate the following areas: white = Europe; black = North America; light grey = Asia; dark grey = range of an entire clade. Black stars indicate vicariance. Arrows indicate the direction of dispersal events. Note that the stratigraphic ranges for each species are not point estimates, but just extend to indicate divisions of particular geochronological stages. Geochronological ages from Gradstein et al. (2004).
Figure 3 in Global historical biogeography of hadrosaurid dinosaurs
Figure 3. Time-calibrated phylogram of Saurolophinae based on the reduced strict consensus tree of Prieto-Márquez (2010). Letters at each node represent ancestral areas as inferred in the DIVA analysis; their meaning is as in Fig. 1. The colors of the stratigraphic ranges of taxa indicate the following areas: white = South America; black = North America; light grey = Asia; dark grey = range of an entire clade. Black stars indicate vicariance. Arrows indicate the direction of dispersal events. Note that the stratigraphic ranges for each species are not point estimates, but just extend to indicate divisions of particular geochronological stages. Geochronological ages from Gradstein et al. (2004).
Figure 2 in Global historical biogeography of hadrosaurid dinosaurs
Figure 2. Time-calibrated phylogram of Hadrosauroidea based on the reduced strict consensus tree of Prieto-Márquez (2010). Letters at each node represent ancestral areas as inferred in the dispersal–vicariance analysis; their meaning is as in Fig. 1. The colours of the stratigraphical ranges of taxa indicate the following areas: white, Europe; black, North America; light grey, Asia; dark grey, range of an entire clade. Black stars indicate vicariance. Arrows indicate the direction of dispersal events. Note that the stratigraphical ranges for each species are not point estimates, but just extend to indicate divisions of particular geochronological stages. Geochronological ages from Gradstein, Ogg, Smith (2004). Abbreviations: a, North America; b, South America; c, Europe; d, Asia; ab, North and South America; ac, North America and Europe; ad, North America and Asia; cd, Eurasia.
Figure 1 in Global historical biogeography of hadrosaurid dinosaurs
Figure 1. Reduced strict consensus tree derived from parsimony analysis of hadrosauroid dinosaurs by Prieto-Márquez (2010), showing ancestral area reconstructions for all the nodes. Words between quotation marks are informal names created to facilitate the reference to specific clades throughout the text. Abbreviations: a, North America; b, South America; c, Europe; d, Asia; ab, North and South America; ac, North America and Europe; ad, North America and Asia; cd, Eurasia.
Figure 7 in Global historical biogeography of hadrosaurid dinosaurs
Figure 7. Distribution of the main hadrosaurid clades discussed in the text on a paleogeographic reconstruction of continental coastlines during the Maastrichtian. Continental paleocoastlines redrawn after Smith et al. (1994), Hay et al. (1999), Blakey (2001), Pough et al. (2004), and Hedges (2006).
Figure 6 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 6. Articulated maxilla and ectopterygoid of ROM 702 in lateral (A) and medial (B) views. Jugal of ROM 702 in lateral (C) and medial (D) views. See text for list of anatomical abbreviations. Scale bar: 5 cm.
Figure 17 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 17. Holotype skull of Hypacrosaurus stebingeri, MOR 549, in lateral view. See text for list of anatomical abbreviations. Scale bar: 10 cm.
Figure 9 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 9. Incomplete squamosal of Hypacrosaurus altispinus (AMNH 5248) in caudal (A), lateral (B), and medial (C) views. See text for list of anatomical abbreviations. Scale bar: 3 cm.
Figure 12 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 12. Left dentary of Hypacrosaurus altispinus, ROM 702, in medial view (A); detailed view of dentary teeth from inset (B). Scale bars: 5 cm in (A); 1 cm in (B).
Figure 7 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 7. Cranial bones of Hypacrosaurus altispinus. A, incomplete jugal of CMN 8674 in lateral view. B and C, incomplete quadratojugal of ROM 702 in lateral and medial views. D, vomer of CMN 2246 in?labial view. Scale bars: 2 cm.
Figure 8 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 8. Incomplete pterygoid of Hypacrosaurus altispinus (ROM 702), in lateral (A), medial (B), and caudal (C) views. Scale bar: 5 cm.
Figure 14 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 14. Bivariate plots of cranial growth exclusive of the cranial crest in lambeosaurine hadrosaurids. Blue (dotted) lines represent regression for Corythsaurus, red (solid) lines represent regression for Hypacrosaurus, and green (dashed) lines represent regression for Lambeosaurus. The log of skull length is the standard variable (x) in all comparisons. •, Corythosaurus casuarius; O, Corythosaurus intermedius morph; ¥, Hypacrosaurus altispinus; +, Hypacrosaurus stebingeri,
Figure 16 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 16. Results of phylogenetic analyses conducted in this study using a modified version of the data matrix presented in Evans & Reisz (2007). Top: strict consensus of three most parsimonious trees (MPTs) recovered from the phylogenetic analysis of Lambeosaurinae. The data resulted in three MPTs of 112 steps, each with a consistency index of 0.9, a rescaled consistency index of 0.83, and a retention index of 0.92. See Evans & Reisz (2007) for a character list. Bottom: majority rule consensus tree resulting from Bayesian analysis (Mk+gamma model) of the same data matrix. Abbreviations: bd, bremer decay value; bs, bootstrap value; us, unambiguous synamorphies; prob, posterior probability values.
Figure 15 in Cranial anatomy and systematics of Hypacrosaurus altispinus, and a comparative analysis of skull growth in lambeosaurine hadrosaurids (Dinosauria: Ornithischia)
Figure 15. Bivariate plots of cranial crest variables in lambeosaurine hadrosaurids. The log of skull length is the standard variable (x) in all comparisons. Blue (dotted) lines represent regression for Corythsaurus, red (solid) lines represent regression for Hypacrosaurus, and green (dashed) lines represent regression for Lambeosaurus. •, Corythosaurus casuarius; O, Corythosaurus intermedius morph; ¥, Hypacrosaurus altispinus; +, Hypacrosaurus stebingeri,, Lambeosaurus lambei, Z, Lambeosaurus clavinitialis morph; °, Lambeosaurus magnicristatus; z, Parasaurolophus walkeri.
Data from: The ‘duck-billed’ dinosaurs of Careless Creek (Upper Cretaceous of Montana, USA), with comments on hadrosaurid ontogeny
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Data from: Examination of a historic collection of isolated cranial and appendicular hadrosaurid material from the lower Kirtland Formation of the San Juan Basin, New Mexico
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Data from: Trace fossils of possible parasites inside the gut contents of a hadrosaurid dinosaur, Upper Cretaceous Judith River Formation, Montana
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