Document Detail

What fossils can tell us about the evolution of viviparity and placentation.
MedLine Citation:
PMID:  18774606     Owner:  NLM     Status:  MEDLINE    
Recently a fossil of one of the earliest jawed fishes was found with a fetal skeleton and the remains of a cord. It was from the Devonian period and takes the history of vertebrate placentation back to 380 million years ago. This and later fossil evidence for viviparity in marine reptiles and early mammals is reviewed. Of particular interest are the fossils of horses as they document that a reproductive strategy with a single precocial newborn was evolved early on. In one instance there is sufficient representation of soft tissue to imply that early horses had a diffuse placenta, much as had been predicted by phylogenetic analyses of placentation.
A M Carter
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Publication Detail:
Type:  Journal Article; Review     Date:  2008-09-06
Journal Detail:
Title:  Placenta     Volume:  29     ISSN:  0143-4004     ISO Abbreviation:  Placenta     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-10-30     Completed Date:  2009-01-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8006349     Medline TA:  Placenta     Country:  England    
Other Details:
Languages:  eng     Pagination:  930-1     Citation Subset:  IM    
Department of Physiology and Pharmacology, University of Southern Denmark, J. B. Winsloewvej 21, Third Floor, DK-5000 Odense, Denmark.
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MeSH Terms
Viviparity, Nonmammalian*

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