1,721,049 research outputs found
A new long-tailed basal bird from the Early Cretaceous of northeastern China
No full textA new basal Avialae, Jeholornis curvipes sp. nov., from the Yixian Formation (Lower Cretaceous) of Liaoning Province (north-eastern China) is described. A revision of long-tailed birds from China and a phylogenetic analysis of basal Avialae suggest that Jeholornithiformes were paraphyletic, with Jixiangornis orientalis being the sister-taxon of pygostylia. The phylogenetic analysis also recovered that the tail reduction is a unique event in the evolution of birds. Jeholornis species were cursorial, nonperching, and seed-eating birds
Figure 2 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
No full textFigure 2. Lithological logs and biochronological/magnetostratigraphical correlations of the Vitrolles-La Plaine and La Cairanne Highway sections. MAAST., Maastrichtian.Published as part of Tabuce, Rodolphe, Tortosa, Thierry, Vianey-Liaud, Monique, Garcia, Géraldine, Lebrun, Renaud, Godefroit, Pascal, Dutour, Yves, Berton, Sévérine, Valentin, Xavier & Cheylan, Gilles, 2013, New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France, pp. 653-672 in Zoological Journal of the Linnean Society 169 (3) on page 656, DOI: 10.1111/zoj.12074, http://zenodo.org/record/529065
Figure 5 in New specimens of Allodaposuchus precedens from France: intraspecific variability and the diversity of European Late Cretaceous eusuchians
No full textFigure 5. Posterior views of adult (A, MMS/VBN-12-10A; B, associated line drawing) and juvenile (C, MMS/VBN- 12-42) specimens of Allodaposuchus precedens Nopcsa, 1928 from the Campanian of Velaux-La Bastide Neuve, France. Abbreviations: boc, basioccipital; cqg, cranioquadrate groove; exo, exoccipital; fm, foramen magnum; fv, foramen vagus; meu, median Eustachian foramen; oc, occipital condyle; p, parietal; pt, pterygoid; q, quadrate; qj, quadratojugal; soc, supraoccipital; socs, supraoccipital spine; sq, squamosal; XII, foramen for cranial nerve XII. Oblique hatching denotes sediment.Published as part of Martin, Jeremy E., Delfino, Massimo, Garcia, Géraldine, Godefroit, Pascal, Berton, Stéphane & Valentin, Xavier, 2016, New specimens of Allodaposuchus precedens from France: intraspecific variability and the diversity of European Late Cretaceous eusuchians, pp. 607-631 in Zoological Journal of the Linnean Society 176 (3) on page 613, DOI: 10.1111/zoj.12331, http://zenodo.org/record/535897
Figure 8 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
No full textFigure 8. Mistralestes arcensis gen. et sp. nov. from La Cairanne Highway, holotype MHNAix-PV.2008.1.1, right dentary fragment with p5 to m3 and roots of p4. A, lingual; B, labial; C, occlusal (stereoscopic) views; mental foramina are highlighted by black dotted lines; D, p5; E, m1 in occlusal view.Published as part of Tabuce, Rodolphe, Tortosa, Thierry, Vianey-Liaud, Monique, Garcia, Géraldine, Lebrun, Renaud, Godefroit, Pascal, Dutour, Yves, Berton, Sévérine, Valentin, Xavier & Cheylan, Gilles, 2013, New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France, pp. 653-672 in Zoological Journal of the Linnean Society 169 (3) on page 664, DOI: 10.1111/zoj.12074, http://zenodo.org/record/529065
Figure 3 in New specimens of Allodaposuchus precedens from France: intraspecific variability and the diversity of European Late Cretaceous eusuchians
No full textFigure 3. An adult skull of Allodaposuchus precedens Nopcsa, 1928 (MMS/VBN-12-10A) from the Campanian of Velaux-La Bastide Neuve, France in dorsal view: A, photograph and B, associated line drawing. Abbreviations: bo, basioccipital; en, external nares; exo, exoccipital; fa, foramen aëreum; fr, frontal; j, jugal; l, lacrimal; ltf, lower temporal fenestra; mx, maxilla; n, nasal; or, orbit; p, parietal; pfr, prefrontal; pmx, premaxilla; po, postorbital; pob, postorbital bar; q, quadrate; qj, quadratojugal; soc, supraoccipital; sq, squamosal; stf, supratemporal fenestra.Published as part of Martin, Jeremy E., Delfino, Massimo, Garcia, Géraldine, Godefroit, Pascal, Berton, Stéphane & Valentin, Xavier, 2016, New specimens of Allodaposuchus precedens from France: intraspecific variability and the diversity of European Late Cretaceous eusuchians, pp. 607-631 in Zoological Journal of the Linnean Society 176 (3) on page 612, DOI: 10.1111/zoj.12331, http://zenodo.org/record/535897
Figure 7 in New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France
No full textFigure 7. Valentinella vitrollense from Vitrolles-La Plaine. UM-VLP-3, probable right?P3 or?P4; A, occlusal; B, labial stereoviews. UP-VLP-07-04, fragment of a left upper molar; C, occlusal; D, distal stereoviews. Yellow, white, and red dotted lines indicate, respectively, the broken parts of the crown, the slope of the protocone, and the lingual slope of the hypocone on the postcingulum.Published as part of Tabuce, Rodolphe, Tortosa, Thierry, Vianey-Liaud, Monique, Garcia, Géraldine, Lebrun, Renaud, Godefroit, Pascal, Dutour, Yves, Berton, Sévérine, Valentin, Xavier & Cheylan, Gilles, 2013, New eutherian mammals from the Late Cretaceous of Aix-en-Provence Basin, south-eastern France, pp. 653-672 in Zoological Journal of the Linnean Society 169 (3) on page 661, DOI: 10.1111/zoj.12074, http://zenodo.org/record/529065
A euenantiornithine bird from the Late Cretaceous Ha?eg Basin of Romania
No full textWe present the first record of a euenantiornithine bird from Romania. A small collection of fossil remains from the Maastrichtian add to the known distribution of large euenantiornithines and descriptions of birds from the Ha?eg Basin augment the known vertebrate fauna from this famous region of Translyvania. The new specimens referred here to an indeterminate taxon of euenantiornithine further demonstrate that the larger members of this diverse Cretaceous lineage were globally distributed, as many birds are today
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Iguanodontian taxa (dinosauria: Ornithischia) from the lower Cretaceous of England and Belgium
No full textThis review summarizes current understanding of the history, anatomy, and taxonomy of British and Belgian iguanodontian dinosaurs. The earliest iguanodontian from this circumscribed region is Berriasian in age and represented by a well-preserved but crushed dentary with many teeth in situ; originally named Iguanodon hoggii Owen, 1874, this specimen has been studied and reassessed several times, and decisions concerning its taxonomic status and systematic position have proved to be consistently inconclusive. I. hoggii has recently been renamed Owenodon hoggii; however, the diagnostic anatomical characters that form the foundation for this new name are few and not taxonomically or systematically robust. It is considered appropriate to regard this undoubtedly important taxonomic entity as indicative of a basal (ankylopollexian) iguanodontian and to encourage new exploration for additional skeletal remains from Berriasian-aged deposits in England. Wealden iguanodontian taxonomy in England has also begun to be scrutinized more thoroughly. Difficulties encountered when trying to diagnose the original (Valanginian) type genus (Iguanodon Mantell, 1825) and species (Iguanodon anglicus Holl, 1829) created problems that were resolved using a rather unfortunate workaround that involved the use of a Barremian-Lower Aptian species: I. bernissartensis Boulenger in Van Beneden 1881. With regard to remains collected from numerous Wealden localities in southern England, it was recognized that known iguanodontians can be subdivided into anatomically and chronologically distinct groupings: an earlier (Valanginian) \"fauna\" represented by Barilium dawsoni (Lydekker, 1888) and Hypselospinus fittoni (Lydekker, 1889), and a later (Barremian-Lower Aptian) \"fauna\" comprising Iguanodon bernissartensis Boulenger in Van Beneden, 1881, and Mantellisaurus atherfieldensis (Hooley, 1925). The Belgian locality at Bernissart, assigned to the Sainte-Barbe Clays Formation (late Barremian-Lower Aptian) has yielded two taxa that have been recognized as anatomically similar to those identified in the contemporaneous Wealden deposits of southern England (the Weald Clay Group of the Wealden District and the Wealden Group of the Isle of Wight). Recent suggestions that further taxa can be diagnosed within the English and Belgian Wealden sequences are assessed (and rejected) on the basis of the evidence presented. © 2012 by Indiana University Press. All rights reserved
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