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Ryan C. McKellar
University of Regina
14Publications
5H-index
93Citations
Publications 14
Newest
Published on Jan 30, 2019in Scientific Reports4.01
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Ryan C. McKellar12
Estimated H-index: 12
(KU: University of Kansas)
+ 3 AuthorsLuis M. Chiappe45
Estimated H-index: 45
(Natural History Museum of Los Angeles County)
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. ...
Published on Jul 1, 2019in Current Biology9.19
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Jingmai K. O’Connor9
Estimated H-index: 9
(CAS: Chinese Academy of Sciences)
+ 5 AuthorsFuming Lei (CAS: Chinese Academy of Sciences)
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...
Published on Jan 29, 2019in Zootaxa0.99
Andris Bukejs8
Estimated H-index: 8
(Daugavpils University),
Vitalii I. Alekseev (Shirshov Institute of Oceanology)+ 2 AuthorsRyan C. McKellar5
Estimated H-index: 5
(KU: University of Kansas)
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...
Published on Jan 1, 2019in Cretaceous Research2.12
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Andrew J. Ross17
Estimated H-index: 17
(National Museum of Scotland)
+ 2 AuthorsRyan C. McKellar5
Estimated H-index: 5
(University of Regina)
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 ...
Published on Jan 1, 2019in Palaeontologia Electronica1.37
Andris Bukejs8
Estimated H-index: 8
(Daugavpils University),
Fabrizio Fanti1
Estimated H-index: 1
,
Ryan C. McKellar5
Estimated H-index: 5
Published on Dec 1, 2018in Scientific Reports4.01
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Benjamin Sames9
Estimated H-index: 9
(University of Vienna)
+ 3 AuthorsWANXiaoqiao14
Estimated H-index: 14
(China University of Geosciences)
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...
Published on Dec 1, 2018in Journal of Palaeogeography
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Pierre F.D. Cockx1
Estimated H-index: 1
(University of Regina)
+ 1 AuthorsJingmai K. O’Connor9
Estimated H-index: 9
(CAS: Chinese Academy of Sciences)
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...
Published on Dec 1, 2018
Anezka Popovski Kolaceke1
Estimated H-index: 1
(University of Regina),
Ryan C. McKellar12
Estimated H-index: 12
(KU: University of Kansas),
Mauricio Barbi1
Estimated H-index: 1
(University of Regina)
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...
Published on Oct 1, 2018in Geochimica et Cosmochimica Acta4.26
Gabriela González Arismendi (U of A: University of Alberta), Ralf Tappert16
Estimated H-index: 16
(U of A: University of Alberta)
+ 2 AuthorsKarlis Muehlenbachs41
Estimated H-index: 41
(U of A: University of Alberta)
Abstract Deuterium exchange experiments on modern and fossil plant resins (amber) were conducted to assess to what extent diagenetic alteration can overprint the stable hydrogen ( δ 2 H) and carbon ( δ 13 C) isotopic composition of these materials. Pairs of resins and amber fragments were placed together with deuterated water in sealed quartz-glass tubes to assure that all samples were exposed equally to the chosen experimental conditions. Experiments lasting up to one year were carried out at t...
Published on Sep 1, 2018in Palaeogeography, Palaeoclimatology, Palaeoecology2.62
Kaarel Mänd2
Estimated H-index: 2
(UT: University of Tartu),
Karlis Muehlenbachs41
Estimated H-index: 41
(U of A: University of Alberta)
+ 2 AuthorsKurt O. Konhauser48
Estimated H-index: 48
(U of A: University of Alberta)
Abstract Ambers—fossilized plant resins—are a rich and unique source of paleoecological data due to their ability to preserve soft body fossils. However, interpretations concerning their environmental context are often hampered by uncertainties in the relationship between assemblages of inclusions and geological context, particularly in the case of secondarily redeposited ambers such as those from the Paleogene of Central Europe. Here we use stable carbon and hydrogen isotope analyses, as well a...
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