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Ryan C. McKellar
University of Kansas
40Publications
12H-index
448Citations
Publications 40
Newest
Published on Jan 30, 2019in Scientific Reports 4.12
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Ryan C. McKellar12
Estimated H-index: 12
(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. ...
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Published on Jan 29, 2019in Zootaxa 0.93
Andris Bukejs8
Estimated H-index: 8
(Daugavpils University),
Vitalii I. Alekseev (Shirshov Institute of Oceanology)+ 2 AuthorsRyan C. McKellar12
Estimated H-index: 12
(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...
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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
(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...
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Published on Dec 1, 2018
Anezka Popovski Kolaceke1
Estimated H-index: 1
(University of Regina),
Ryan C. McKellar12
Estimated H-index: 12
(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...
1 Citations Source Cite
Published on Oct 1, 2018in Geochimica et Cosmochimica Acta 4.69
Gabriela González Arismendi (University of Alberta), Ralf Tappert16
Estimated H-index: 16
(University of Alberta)
+ 2 AuthorsKarlis Muehlenbachs41
Estimated H-index: 41
(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...
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Published on Feb 1, 2018in Chinese Science Bulletin
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Jingmai K. O'Connor22
Estimated H-index: 22
(Chinese Academy of Sciences)
+ 7 AuthorsLIGang16
Estimated H-index: 16
(Chinese Academy of Sciences)
Abstract Cretaceous amber from Myanmar (∼99 Ma Burmese amber) has become a valuable supplement to the traditional skeletal record of small theropod dinosaurs preserved in sedimentary rocks, particularly for coelurosaurs and enantiornithines. The specimens recovered from this deposit preserve skeletal material and soft tissues in unmatched detail. This provides opportunities to study three-dimensional preservation of soft tissues, microstructure, and pigmentation patterns that are seldom availabl...
3 Citations Source Cite
Published on Sep 1, 2017in Gondwana Research 5.66
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Jingmai K. O'Connor22
Estimated H-index: 22
(Chinese Academy of Sciences)
+ 4 AuthorsMing Bai15
Estimated H-index: 15
(Chinese Academy of Sciences)
Abstract Burmese amber has recently provided some detailed glimpses of plumage, soft tissues, and osteology of juvenile enantiornithine birds, but these insights have been restricted to isolated wing apices. Here we describe nearly half of a hatchling individual, based on osteological and soft tissue data obtained from the skull, neck, feet, and wing, and identified as a member of the extinct avian clade Enantiornithes. Preserved soft tissue provides the unique opportunity to observe the externa...
19 Citations Source Cite
Published on Dec 1, 2016in Cretaceous Research 1.93
Pierre F.D. Cockx1
Estimated H-index: 1
(University of Rennes),
Ryan C. McKellar12
Estimated H-index: 12
,
Vincent Perrichot17
Estimated H-index: 17
(University of Rennes)
Abstract Two new genera and species of fossil chrysidoid wasps belonging to the families Chrysididae and Bethylidae are described from Charentese (Fouras Bois-Vert and Archingeay) lower Upper Cretaceous amber of France. New taxa include: Sphaerocleptes neraudeaui n. gen. et sp., and Nucifrangibulum carentonensis n. gen. et sp. A new bethylid wasp is also described but left in open nomenclature. These findings are the first records of the subfamilies Cleptinae and Bethylinae in these deposits and...
3 Citations Source Cite
Published on Jul 26, 2016in Zootaxa 0.93
Andris Bukejs8
Estimated H-index: 8
(Daugavpils University),
Vitalii I. Alekseev3
Estimated H-index: 3
(Kaliningrad State Technical University),
Ryan C. McKellar12
Estimated H-index: 12
Based on two relatively well-preserved specimens from Eocene Baltic amber, Passandra septentrionaria sp. nov. is described and illustrated. It is the first formally described species of Passandridae from Baltic amber, and the first known European representative of the family. The global distribution of extant Passandra Dalman is mapped, and the historical distribution of the group is briefly discussed.
1 Citations Source Cite
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