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Ryan C. McKellar
University of Regina
20Publications
5H-index
98Citations
Publications 20
Newest
#1Lida Xing (China University of Geosciences)H-Index: 18
#2Ryan C. McKellar (KU: University of Kansas)H-Index: 12
Last.Luis M. Chiappe (Natural History Museum of Los Angeles County)H-Index: 45
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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. ...
#1Lida Xing (China University of Geosciences)H-Index: 18
#2Donghao Wang (China University of Geosciences)
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 ...
#1Lida Xing (China University of Geosciences)H-Index: 18
#2Jingmai K. O’Connor (CAS: Chinese Academy of Sciences)H-Index: 9
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...
#1Andris Bukejs (Daugavpils University)H-Index: 8
#2Vitalii I. Alekseev (Shirshov Institute of Oceanology)
Last.Ryan C. McKellar (KU: University of Kansas)H-Index: 5
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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...
#1Lida Xing (China University of Geosciences)H-Index: 18
#2Andrew J. Ross (National Museum of Scotland)H-Index: 17
Last.Ryan C. McKellar (University of Regina)H-Index: 5
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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 ...
#1Lida Xing (China University of Geosciences)H-Index: 18
#2Benjamin Sames (University of Vienna)H-Index: 9
Last.WANXiaoqiao (China University of Geosciences)H-Index: 14
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The mid-Cretaceous Burmese amber (~99 Ma, Myanmar), widely known for exquisite preservation of theropods, also yields microfossils, which can provide important contextual information on paleoenvironment and amber formation. We report the first Cretaceous ostracod in amber—the gigantic (12.9 mm) right valve of an exclusively marine group (Myodocopa: Myodocopida) preserved in Burmese amber. Ostracods are usually small (0.5–2 mm), with well-calcified carapaces that provide an excellent fossil recor...
#1Lida Xing (China University of Geosciences)H-Index: 18
#2Pierre F.D. Cockx (University of Regina)H-Index: 1
Last.Jingmai K. O’Connor (CAS: Chinese Academy of Sciences)H-Index: 9
view all 4 authors...
Over the last 20 years, compression fossils of feathers surrounding dinosaurs have greatly expanded our understanding of the origin and evolution of feathers. One of the most peculiar feather morphotypes discovered to date are rachis dominated feathers (RDFs), which have also been referred to as proximally ribbon-like pennaceous feathers (PRPFs). These elongate feathers are only found in the tail plumage, typically occurring in pairs with both streamer (not proximally ribbon-like) and racket-plu...
#1Anezka Popovski Kolaceke (University of Regina)H-Index: 1
#2Ryan C. McKellar (KU: University of Kansas)H-Index: 12
Last.Mauricio Barbi (University of Regina)H-Index: 1
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Synchrotron-based techniques offer a wealth of elemental, molecular, and structural insights in biological samples, but the application of these techniques to fossils is a relatively new development. Here we examine how synchrotron radiation micro X-ray fluorescence (SR µXRF) may be used to investigate the chemical composition of insects trapped in amber, while leaving the inclusions unaltered. Elemental distribution data could provide important information on tissue preservation in insect inclu...
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