Placentation in species of phylogenetic importance: the Afrotheria.

Details

Serval ID
serval:BIB_A1AC2994A2DC
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Placentation in species of phylogenetic importance: the Afrotheria.
Journal
Animal Reproduction Science
Author(s)
Carter A.M., Enders A.C., Künzle H., Oduor-Okelo D., Vogel P.
ISSN
0378-4320 (Print)
ISSN-L
0378-4320
Publication state
Published
Issued date
2004
Volume
82-83
Pages
35-48
Language
english
Abstract
Afrotheria, one of four mammalian superorders, comprises elephants, sea cows, hyraxes, aardvark, elephant shrews, tenrecs and golden moles. Their placentas either form an equatorial band or are discoid in shape. The interhemal region, separating fetal and maternal blood, is endotheliochorial in elephants, aardvark and possibly the sea cows, but hemochorial in the remaining orders. There is a secondary epitheliochorial placenta in elephant shrews while a similar structure in tenrecs erodes maternal tissues. Specialized hemophagous regions are a striking characteristic of some of these placentas yet absent in hyraxes, elephant shrews, and golden moles. It is possible that the common ancestor of the Afrotheria had an endotheliochorial placenta. Establishment of a hemochorial condition, as seen in rock hyraxes, elephant shrews, tenrecs, and golden moles, would be a more recent development. The elephant, manatee, and aardvark all have circumferential placentas. Thus the formation of a discoid placenta with a more or less extensive secondary placenta in elephant shrews and tenrecs would also be a derived state.
Keywords
Animals, Biological Evolution, Dugong, Elephants, Female, Hyraxes, Insectivora, Mammals, Moles, Placenta/anatomy & histology, Placenta/physiology, Placentation, Pregnancy, Shrews, Xenarthra
Pubmed
Web of science
Create date
24/01/2008 17:32
Last modification date
20/08/2019 15:07
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