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Reproductive Biology and Endocrinology
Published in: Reproductive Biology and Endocrinology 1/2007

Open Access 01-12-2007 | Research

Placentation in dolphins from the Amazon River Basin: the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis

Authors: Vera MF da Silva, Anthony M Carter, Carlos E Ambrosio, Ana F Carvalho, Marina Bonatelli, Marcelo C Lima, Maria Angelica Miglino

Published in: Reproductive Biology and Endocrinology | Issue 1/2007

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Abstract

A recent reassessment of the phylogenetic affinities of cetaceans makes it timely to compare their placentation with that of the artiodactyls. We studied the placentae of two sympatric species of dolphin from the Amazon River Basin, representing two distinct families. The umbilical cord branched to supply a bilobed allantoic sac. Small blood vessels and smooth muscle bundles were found within the stroma of the cord. Foci of squamous metaplasia occurred in the allanto-amnion and allantochorion. The interhemal membrane of the placenta was of the epitheliochorial type. Two different types of trophoblastic epithelium were seen. Most was of the simple columnar type and indented by fetal capillaries. However, there were also areolar regions with tall columnar trophoblast and these were more sparsely supplied with capillaries. The endometrium was well vascularised and richly supplied with actively secreting glands. These findings are consistent with the current view that Cetacea are nested within Artiodactyla as sister group to the hippopotamids.
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Metadata
Title
Placentation in dolphins from the Amazon River Basin: the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis
Authors
Vera MF da Silva
Anthony M Carter
Carlos E Ambrosio
Ana F Carvalho
Marina Bonatelli
Marcelo C Lima
Maria Angelica Miglino
Publication date
01-12-2007
Publisher
BioMed Central
Published in
Reproductive Biology and Endocrinology / Issue 1/2007
Electronic ISSN: 1477-7827
DOI
https://doi.org/10.1186/1477-7827-5-26

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