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The transition itself can only be illustrated and corroborated by transitional fossils, which never demonstrate an exact half-way point between clearly divergent forms. [ 40 ] The fossil record is very uneven and, with few exceptions, is heavily slanted toward organisms with hard parts, leaving most groups of soft-bodied organisms with little ...
The Cambridge Encyclopedia of Human evolution. Cambridge University Press. ISBN 978-0-521-46786-5. (Note: this book contains very useful, information dense chapters on primate evolution in general, and human evolution in particular, including fossil history). Leakey, Richard & Lewin, Roger. Origins Reconsidered: In Search of What Makes us Human ...
A symbolic portrayal of human evolution, showing developmental stages as a matter of illustration. "Missing link" is a recently-discovered transitional fossil.It is often used in popular science and in the media for any new transitional form.
The complete transition occurred over a period of 30 million years beginning with the tetrapodomorph diversification in the Middle Devonian (380 myr). [ 2 ] By the Upper Devonian period, the fin-limb transition as well as other skeletal changes such as gill arch reduction, opercular series loss, mid-line fin loss, and scale reduction were ...
The history of the camel provides an example of how fossil evidence can be used to reconstruct migration and subsequent evolution. The fossil record indicates that the evolution of camelids started in North America (see figure 4e), from which, six million years ago, they migrated across the Bering Strait into Asia and then to Africa, and 3.5 ...
Panderichthys exhibits features transitional between lobe-finned fishes and early tetrapods. Trackway impressions made by something that resembles Ichthyostega's limbs were formed 390 Ma in Polish marine tidal sediments. This suggests tetrapod evolution is older than the dated fossils of Panderichthys through to Ichthyostega. 375-350 Ma Tiktaalik
The fossil record includes well documented examples of both phyletic gradualism and punctuational evolution. [17] As such, much debate persists over the prominence of stasis in the fossil record. [18] [19] Before punctuated equilibrium, most evolution biologists considered stasis to be rare or unimportant.
The following species are often understood to be transitional fossils, many of which can be found at List of transitional fossils. Subcategories.
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