Pikaia gracilens Walcott: stem chordate, or already specialized in the Cambrian?
- BiologyJournal of experimental zoology. Part B, Molecular and developmental evolution
A cladistic analysis showed the character interpretations of CMC are consistent with their wide-ranging evolutionary scenario, but that these interpretations leave unresolved the position of Pikaia within chordates.
Conclusion and Implications
- Biology, Psychology
This chapter summarizes the different aspects of the theory of increasing autonomy in evolution. The relationship of autonomy to adaptation and natural selection is described, and questions for…
SHOWING 1-8 OF 8 REFERENCES
The predictability of evolution: glimpses into a post-Darwinian world
It is argued that in sharp contradistinction to an orthodox Darwinian view, not only is evolution much more predictable than generally assumed but also investigation of its organizational substrates, including those of sensory systems, indicates that it is possible to identify a predictability to the process and outcomes of evolution.
Life's Solution: Inevitable Humans in a Lonely Universe
- ArtArtificial Life
This book suggests that, if the authors were to examine the evolutionary process on an imaginary earth-like planet, Threga IX, situated far away from us, possibly in another galaxy, they would probably find beings very much like us living there, in direct contrast to the belief of Stephen Jay Gould.
Reconstructing a Lost World: Ediacaran Rangeomorphs from Spaniard's Bay, Newfoundland
- Environmental Science
Abstract Ediacaran fronds at Spaniard's Bay on the Avalon Peninsula of Newfoundland exhibit exquisite, three-dimensional preservation with morphological features less than 0.05 mm in width visible on…
The earliest history of the deuterostomes: the importance of the Chengjiang Fossil-Lagerstätte
- GeographyProceedings of the Royal Society B: Biological Sciences
The known diversity of Chengjiang deuterostomes are reviewed and it is argued that the vetulicolians and yunnanozoans represent very primitive deuterOSTomes, as well as new data to indicate that the yunncozoans are unlikely to be any sort of chordate.
Early origin of the bilaterian developmental toolkit
- BiologyPhilosophical Transactions of the Royal Society B: Biological Sciences
It is suggested that placozoans and cnidarians represent a depauperate residue of a once more diverse assemblage of early animals, some of which may be represented in the Ediacaran fauna (c. 585–542 Myr ago).
Wonderful Life: The Burgess Shale and the Nature of History, Stephen Jay Gould. W. W. Norton, New York (1989), 347, Price $19.95 (U.S.A.), $27.95 (Canada)
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Life’s Solution: Inevitable Humans in a Lonely Universe (Cambridge