Placentation in dolphins from the Amazon River Basin

the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis

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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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.
OriginalsprogEngelsk
TidsskriftReproductive Biology and Endocrinology
Vol/bind5
Sider (fra-til)26
ISSN1477-7827
DOI
StatusUdgivet - 2007

Fingeraftryk

Dolphins
Placentation
Placenta
Cetacea
Sympatry
Amnion
Umbilical Cord
Trophoblasts
Endometrium
Smooth Muscle
Epithelium
Membranes

Citer dette

da Silva, Vera M F ; Carter, Anthony M ; Ambrosio, Carlos E ; Carvalho, Ana F ; Bonatelli, Marina ; Lima, Marcelo C ; Miglino, Maria Angelica. / Placentation in dolphins from the Amazon River Basin : the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis. I: Reproductive Biology and Endocrinology. 2007 ; Bind 5. s. 26.
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title = "Placentation in dolphins from the Amazon River Basin: the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis",
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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Placentation in dolphins from the Amazon River Basin : the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis. / da Silva, Vera M F; Carter, Anthony M; Ambrosio, Carlos E; Carvalho, Ana F; Bonatelli, Marina; Lima, Marcelo C; Miglino, Maria Angelica.

I: Reproductive Biology and Endocrinology, Bind 5, 2007, s. 26.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Placentation in dolphins from the Amazon River Basin

T2 - the Boto, Inia geoffrensis, and the Tucuxi, Sotalia fluviatilis

AU - da Silva, Vera M F

AU - Carter, Anthony M

AU - Ambrosio, Carlos E

AU - Carvalho, Ana F

AU - Bonatelli, Marina

AU - Lima, Marcelo C

AU - Miglino, Maria Angelica

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

KW - Allantois

KW - Amnion

KW - Animals

KW - Brazil

KW - Capillaries

KW - Dolphins

KW - Endometrium

KW - Epithelium

KW - Female

KW - Phylogeny

KW - Placenta

KW - Placental Circulation

KW - Pregnancy

KW - Umbilical Cord

U2 - 10.1186/1477-7827-5-26

DO - 10.1186/1477-7827-5-26

M3 - Journal article

VL - 5

SP - 26

JO - Reproductive Biology and Endocrinology

JF - Reproductive Biology and Endocrinology

SN - 1477-7827

ER -