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The origin and early radiation of terrestrial vertebrates
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ABSTRACT-The origin of tetrapods from sarcopterygian fish in the Late Devonian is one of the best known major transitions in the history of vertebrates. Unfortunately, extensive gaps in the fossil record of the Lower Carboniferous and Triassic make it very difficult to establish the nature of relationships among Paleozoic tetrapods, or their specific affinities with modern amphibians. The major lineages of Paleozoic labyrinthodonts and lepospondyls are not adequately known until after a 20-30...
Related newspaper, magazine, and journal articles from HighBeam Research
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New fossils threaten an extinction theory.(Famennian stage questioned)(Brief Article)
Science News
; Recent discoveries of long-gone marine invertebrates call into question the occurrence of a catastrophic global extinction hundreds of millions of years ago. The loss of diversity wasn't as widespread and didn't last as long as paleontologists had previously thought, several researchers now
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The Primate Fossil Record
Journal of Paleontology
; Walter C. Hartwig (ed 2002. The Primate Fossil Record. Cambridge University Press, Cambridge, 503 p., cloth, ISBN 0-52166315-6. During the last half of the twentieth century, paleontological knowledge of primate evolution grew tremendously and continues today to expand al a (positively) alarmingly
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Inferring natural selection in a fossil threespine stickleback
Paleobiology
; Abstract.-Inferring the causes for change in the fossil record has been a persistent problem in evolutionary biology. Three independent lines of evidence indicate that a lineage of the fossil stickleback fish Gasterosteus doryssus experienced directional natural selection for reduction of armor.
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Bee fossil and orchid origins.(Headline Science)
The Science Teacher
; ... they began to flourish shortly after the mass extinction at the so-called 'K/T boundary' between the Cretaceous and Tertiary periods, which decimated many of Earth's species. (Harvard University) www.news.harvard.edu/gazette/2007/09.13/99-orchid.html
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Bees and orchids.(In The News: Short news items of interest to the scientific community)
Science and Children
; ... began to flourish shortly after the mass extinction at the so-called 'K/T boundary' between the Cretaceous and Tertiary periods, which decimated many of Earth's species. Harvard University (www.news. harvard.edu/gazette/2007/09.13/ 99-orchid.html)
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