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Ryan C. McKellar
University of Kansas
60Publications
13H-index
631Citations
Publications 64
Newest
#1Pierre F.D. Cockx (University of Regina)H-Index: 3
#2Ryan C. McKellar (KU: University of Kansas)H-Index: 13
Last.Karlis Muehlenbachs (U of A: University of Alberta)H-Index: 50
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Abstract Amber deposits and dinosaur bonebeds provide some of the most detailed sources of information on terrestrial ecosystems, but these sources have rarely been studied in tandem. The Pipestone Creek bonebed from the Campanian Wapiti Formation of Alberta, Canada, provides an opportunity to explore both data sources in the same deposit for the first time. The site has yielded an exceptional fauna dominated by abundant remains of the centrosaurine ceratopsian Pachyrhinosaurus. The initial camp...
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#2Stacey GibbH-Index: 7
Last.Ryan C. McKellarH-Index: 13
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Three new species of Cyphaspides are proposed: C. ammari, C. nicoleae , and C. pankowskiorum . These species are based on specimens obtained from Middle Devonian (Eifelian) strata of the Bou Tchrafine Group, near Erfoud, in the Province of Errachidia, southeastern Morocco. The present contribution enhances our knowledge of Cyphaspides by providing details of three new species that are based on well-preserved, complete, and articulated types. The genus Cyphaspides is discussed, and an emended dia...
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#1Ryan C. McKellar (KU: University of Kansas)H-Index: 13
#2Emma Jones (U of A: University of Alberta)H-Index: 1
Last.Philip J. Currie (U of A: University of Alberta)H-Index: 52
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Hadrosaurian dinosaurs were abundant in the Late Cretaceous of North America, but their habitats remain poorly understood. Cretaceous amber is also relatively abundant, yet it is seldom found in direct stratigraphic association with dinosaur remains. Here we describe an unusually large amber specimen attached to a Prosaurolophus jaw, which reveals details of the contemporaneous paleoforest and entomofauna. Fourier-transform Infrared spectroscopy and stable isotope composition (H and C) suggest t...
1 CitationsSource
#1Lida Xing (China University of Geosciences)H-Index: 19
#2Ryan C. McKellar (KU: University of Kansas)H-Index: 13
Last.Huijuan Mai (Yunnan University)
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Since the first skeletal remains of avians preserved in amber were described in 2016, new avian remains trapped in Cretaceous-age Burmese amber continue to be uncovered, revealing a diversity of skeletal and feather morphologies observed nowhere else in the Mesozoic fossil record. Here we describe a foot with digital proportions unlike any previously described enantiornithine or Mesozoic bird. No bones are preserved in the new specimen but the outline of the foot is recorded in a detailed skin s...
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#1Lida Xing (China University of Geosciences)H-Index: 19
#2Ryan C. McKellar (KU: University of Kansas)H-Index: 13
Last.Luis M. Chiappe (Natural History Museum of Los Angeles County)H-Index: 47
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Over the last three years, Burmese amber (~99 Ma, from Myanmar) has provided a series of immature enantiornithine skeletal remains preserved in varying developmental stages and degrees of completeness. These specimens have improved our knowledge based on compression fossils in Cretaceous sedimentary rocks, adding details of three-dimensional structure and soft tissues that are rarely preserved elsewhere. Here we describe a remarkably well-preserved foot, accompanied by part of the wing plumage. ...
3 CitationsSource
#1Vitalii I. Alekseev (Shirshov Institute of Oceanology)
#2Andris Bukejs (Daugavpils University)H-Index: 9
Last.Ryan C. McKellar (KU: University of Kansas)H-Index: 13
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Abstract. A new fossil species of the silvanid flat bark beetle genus Cathartosilvanus Grouvelle is described and illustrated from Baltic amber. Cathartosilvanus siteiterralevis sp. nov. differs from recent and fossil congeners in the distinct, sharp denticle found along its posterior pronotal angle. The phenomenon of specific body parts becoming disconnected, and the compression of specimens is briefly discussed and interpreted in the context of amber taphonomy. The specimen under study appears...
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#1Lida Xing (China University of Geosciences)H-Index: 19
#2Donghao Wang (China University of Geosciences)H-Index: 1
Last.Susan E. Evans (UCL: University College London)H-Index: 38
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ABSTRACTThe eggs of fish, amphibians, and many invertebrates are soft, delicate structures that are only rarely preserved in the fossil record. Here we report egg masses preserved as inclusions in ...
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#1Lida Xing (China University of Geosciences)H-Index: 19
#2Jingmai K. O’Connor (CAS: Chinese Academy of Sciences)H-Index: 26
Last.Fuming Lei (CAS: Chinese Academy of Sciences)
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Summary Recent discoveries of vertebrate remains trapped in middle Cretaceous amber from northern Myanmar [ 1 , 2 ] have provided insights into the morphology of soft-tissue structures in extinct animals [ 3 , 4 , 5 , 6 , 7 ], in particular, into the evolution and paleobiology of early birds [ 4 , 8 , 9 ]. So far, five bird specimens have been described from Burmese amber: two isolated wings, an isolated foot with wing fragment, and two partial skeletons [ 4 , 8 , 9 , 10 ]. Most of these specime...
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#1Andris Bukejs (Daugavpils University)H-Index: 9
#2Vitalii I. Alekseev (Shirshov Institute of Oceanology)
Last.Ryan C. McKellar (KU: University of Kansas)H-Index: 13
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Based on a well-preserved specimen from Eocene Baltic amber, the second fossil species belonging to the genus Pycnomerus Erichson (Coleoptera: Zopheridae: Zopherinae), P . agtsteinicus Bukejs, Alekseev & McKellar sp. nov. is described and illustrated using synchrotron X-ray micro-CT observations. The new species adds to the sparse fossil record of Pycnomerus , which consists of the Baltic amber discoveries, and only four subfossil records in sediments that are less than one million years old. As...
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#1Lida Xing (China University of Geosciences)H-Index: 19
#2Andrew J. Ross (National Museum of Scotland)H-Index: 18
Last.Ryan C. McKellar (University of Regina)H-Index: 13
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Abstract Gastropods are generally rare in amber. In this paper we describe an example of exceptional soft-bodied preservation in a fossil terrestrial mollusk-a snail shell with some tissue, including part of the cephalic region (head) with a tentacle and inferred eye stalk, and potentially part of the foot and operculum. The snail, a probable juvenile, is preserved in Burmese amber (Burmite) from Myanmar, of earliest Cenomanian age. Morphological evidence suggests a cyclophoroidean ancestry and ...
4 CitationsSource
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