Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Jonathan E. Jeffery"'
Autor:
Thomas J. Challands, Zerina Johanson, Jennifer A. Clack, Stephanie E. Pierce, Jonathan E. Jeffery
The Rhizodontida are a group of tetrapodomorph sarcopterygian fishes with a worldwide distribution in the Devonian and Carboniferous periods. Rhizodontids were first described in the U.K., with Carboniferous taxa such as Rhizodus, Strepsodus, and Arc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69f4658f37020d02e03ccfd3aa978e63
Autor:
Jonathan E. Jeffery
Publikováno v:
Journal of Systematic Palaeontology. 10:475-519
Well-preserved material is described of several specimens of Screbinodus ornatus, a small (approximately 1.5 metres long) rhizodontid sarcopterygian, from the Visean (Mississippian, Carboniferous) of Scotland. This species shows numerous ‘typical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::033721b1eccb29865cb8f0a12b7001cb
https://doi.org/10.1080/14772019.2011.595961
https://doi.org/10.1080/14772019.2011.595961
Autor:
Jonathan E. Jeffery
Publikováno v:
Palaeontology. 49:113-132
The Carboniferous genus Strepsodus contains several described species, but has been mired in taxonomic confusion for nearly 150 years. The little-known genus Archichthys (with two described species) is usually treated as a junior synonym of Strepsodu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::737226ca38947eb2557d43f71c0436e9
https://doi.org/10.1111/j.1475-4983.2005.00531.x
https://doi.org/10.1111/j.1475-4983.2005.00531.x
Publikováno v:
Systematic Biology. 54:230-240
Sequence heterochrony (changes in the order in which events occur) is a potentially important, but relatively poorly explored, mechanism for the evolution of development. In part, this is because of the inherent difficulties in inferring sequence het
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::668af9063838f84ec5adab08ace6cdf3
https://doi.org/10.1080/10635150590923227
https://doi.org/10.1080/10635150590923227
Publikováno v:
Proceedings of the Royal Society of London. Series B: Biological Sciences. 270:2507-2516
A genus-level supertree for early tetrapods is built using a matrix representation of 50 source trees. The analysis of all combined trees delivers a long-stemmed topology in which most taxonomic groups are assigned to the tetrapod stem. A second anal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c93e1ed4219f71ac7848926ea708c7c
https://doi.org/10.1098/rspb.2003.2524
https://doi.org/10.1098/rspb.2003.2524
Publikováno v:
Theory in Biosciences. 121:247-251
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f6d8dc4c56957c48333081c464623540
https://doi.org/10.1007/s12064-002-0012-9
https://doi.org/10.1007/s12064-002-0012-9
Autor:
Jonathan E. Jeffery
Publikováno v:
Transactions of the Royal Society of Edinburgh: Earth Sciences. 93:255-276
The Rhizodontida (Pisces: Sarcopterygii) is a clade of predatory fishes from the Upper Devonian (Aztecia; ?Givetian of Antarctica) through to the Upper Carboniferous (Strepsodus; Moscovian of northern Europe and North America). They form the most bas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c6b466fff166903c604c5931e8e4f5b2
https://doi.org/10.1017/s0263593300000432
https://doi.org/10.1017/s0263593300000432
Publikováno v:
Evolution and Development. 4:390-401
A broad phylogenetic review of fins, limbs, and girdles throughout the stem and base of the crown group is needed to get a comprehensive idea of transformations unique to the assembly of the tetrapod limb ground plan. In the lower part of the tetrapo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::304b86e1eac226936d17d8f6c5f101c8
https://doi.org/10.1046/j.1525-142x.2002.02026.x
https://doi.org/10.1046/j.1525-142x.2002.02026.x
Publikováno v:
Evolution and Development. 4:292-302
SUMMARY Heterochrony (differences in developmental timing between species) is a major mechanism of evolutionary change. However, the dynamic nature of development and the lack of a universal time frame makes heterochrony difficult to analyze. This ha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::804362e37ad421ec6fe23739841ed521
https://doi.org/10.1046/j.1525-142x.2002.02018.x
https://doi.org/10.1046/j.1525-142x.2002.02018.x
Publikováno v:
Systematic Biology. 51:478-491
Heterochronyisimportantasapotentialmechanism ofevolutionarychange.However,the analysis of developmental timing data within a phylogenetic framework to identify important shifts has proven difecult. In particular, analytical problems with sequence (ev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ab84099c90f78ca5cf622636987a1b5
https://doi.org/10.1080/10635150290069904
https://doi.org/10.1080/10635150290069904