Skip to main content
main-content

01.12.2012 | Research | Ausgabe 1/2012 Open Access

Reproductive Biology and Endocrinology 1/2012

Placentation in the anteaters Myrmecophaga tridactyla and Tamandua tetradactyla (Eutheria, Xenarthra)

Zeitschrift:
Reproductive Biology and Endocrinology > Ausgabe 1/2012
Autoren:
Andrea M Mess, Phelipe O Favaron, Christiane Pfarrer, Christine Osmann, Allan PF Melo, Rosangela F Rodrigues, Carlos E Ambrósio, Estela Bevilacqua, Maria A Miglino
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1477-7827-10-102) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors' contributions

MAM devised the study and participated in its design. AMM analyzed the material and wrote the manuscript, supported by POF and CP. All other authors were involved in the acquisition and procession of this rare material. All authors read and approved the final manuscript.

Abstract

Background

Since Xenarthra are serious candidates for being basal to Eutheria, their characteristics, e.g. the placental system, influence perceptions of evolution. However, in the subgroup containing the anteaters, data are very limited. The present study aims to elucidate the nature of the feto-maternal interface in the anteater placenta and to interpret these data within an evolutionary context.

Methods

Placentas of two species were investigated with histology, immunohistochemistry and transmission electron microscopy.

Results

Remnants of the maternal vessel endothelium were absent, resulting in a fully haemochorial barrier throughout the placenta. Two structurally different parts, the villous and trabecular areas were complex and intermingled. In particular, the trabeculae which consisted of cellular, proliferative trophoblast, associated with connective tissue, were attached to the decidua. The villi contained fetal capillaries and hypertrophied mesenchymal cells that occured near the surface near the end of gestation. The surface of the villi consisted of flat, syncytial trophoblast, interspersed with proliferative trophoblast cells.

Conclusions

Based on fundamental differences between anteaters and armadillos, we inferred that placental evolution was more complex than previously thought. The haemochorial pattern of anteaters was likely an ancient condition of xenarthrans. Consequently, villous placentation may be attributed, at least in part, by convergent evolution, but was also characterized by some features that were widespread among xenarthrans.
Zusatzmaterial
Authors’ original file for figure 1
12958_2012_1030_MOESM1_ESM.tiff
Authors’ original file for figure 2
12958_2012_1030_MOESM2_ESM.tiff
Authors’ original file for figure 3
12958_2012_1030_MOESM3_ESM.tiff
Authors’ original file for figure 4
12958_2012_1030_MOESM4_ESM.tiff
Authors’ original file for figure 5
12958_2012_1030_MOESM5_ESM.tiff
Literatur
Über diesen Artikel

Weitere Artikel der Ausgabe 1/2012

Reproductive Biology and Endocrinology 1/2012 Zur Ausgabe

Neu im Fachgebiet Gynäkologie und Geburtshilfe

Meistgelesene Bücher aus dem Fachgebiet

2014 | Buch

Perikonzeptionelle Frauenheilkunde

Fertilitätserhalt, Prävention und Management von Schwangerschaftsrisiken

Ein Praxisbuch für alle, die in der Beratung und Betreuung von Schwangeren und Paaren mit Kinderwunsch tätig sind. Die Herausgeber und Autoren haben alle wichtigen Informationen zusammengetragen, um Frauen sicher zu beraten, zu betreuen und kompetent Verantwortung zu übernehmen.

Herausgeber:
Christian Gnoth, Peter Mallmann

2014 | Buch

Praxisbuch Gynäkologische Onkologie

Das Nachschlagewerk für alle Ärzte in Klinik und Praxis, die Patientinnen mit bösartigen Tumoren des Genitales und der Mamma behandeln. Dieses Buch gibt in kompakter Weise einfach umsetzbare Handlungsanweisungen zum diagnostischen und therapeutischen Vorgehen und Hilfestellungen für die optimale Versorgung der Patientinnen.

Herausgeber:
Edgar Petru, Walter Jonat, Daniel Fink, Ossi R. Köchli

Mail Icon II Newsletter

Bestellen Sie unseren kostenlosen Newsletter Update Gynäkologie und bleiben Sie gut informiert – ganz bequem per eMail.

Bildnachweise