The serial transformation hypothesis of vertebrate origins: comment on "The new head hypothesis revisited"

Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
A B Butler

Abstract

In "The New Head Hypothesis Revisited," R.G. Northcutt (2005. J Exp Zool (Mol Dev Evol) 304B:274-297) evaluates the original postulates of this hypothesis (Northcutt and Gans, 1983. Quart Rev Biol 58:1-28). One of these postulates is that the brain-particularly the forebrain-evolved at essentially the same time as many neural crest and neurogenic placode derivatives-including sensory ganglia, dermal skeleton and sensory capsules of the head, and branchial arches. Northcutt's subsequent paper in 1996 concluded with the idea that transitional forms might not have occurred at the origin of vertebrates. Butler proposed a "Serial Transformation" hypothesis in 2000, which disputed the latter idea in that paired eyes and an enlarged brain (but lacking telencephalon) were envisioned to have been gained before elaboration of most neural crest and neurogenic placodal derivatives. In 2003, J. Mallatt and J.-Y. Chen analyzed fossils of the Cambrian animal Haikouella, which strongly support its affinity to craniates and aspects of several hypotheses, including Butler's transformational model, because although branchial bars are present, most other neural crest and placodal derivatives are absent, while paired eyes and an enlarged brain (but...Continue Reading

References

Aug 1, 1989·Biological Reviews of the Cambridge Philosophical Society·C Gans
Mar 1, 1983·The Quarterly Review of Biology·R G Northcutt, C Gans
Nov 18, 2000·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·A B Butler
Jul 20, 2002·Zoological Science·Rebecca F Furlong, Peter W H Holland
Aug 9, 2003·Journal of Morphology·Jon Mallatt, Jun-yuan Chen
Oct 8, 2004·Nature·William R JefferyYoshiyuki Yamamoto
Jul 9, 2005·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·R Glenn Northcutt
Apr 15, 1983·Science·C Gans, R G Northcutt

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Citations

Sep 12, 2009·Current Gerontology and Geriatrics Research·Deborah M SlobodaMark H Vickers
Feb 11, 2009·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Philip C J Donoghue, Mark A Purnell
Nov 22, 2014·Molecular Biology and Evolution·Martin Sebastijan Šestak, Tomislav Domazet-Lošo
Nov 13, 2008·Genesis : the Journal of Genetics and Development·Jun-Yuan Chen

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