Abstract
BackgroundPlacental research in carnivores has concentrated on domestic species, which have zonary, labyrinthine placentas with an endotheliochorial barrier. Although the coati, Nasua nasua, is a widely distributed species in South America, data on the development of the placenta and the fetal membranes in this species are very sparse.FindingsFour placentas from mid-gestation to near term were collected from wild individuals and were investigated based on gross morphology, histology, immunohistochemistry and electron microscopy. The available data support the concept that the ancestral condition of placentation in carnivores is phylogenetically characterized by a zonary and labyrinthine placental type with an endotheliochorial fetomaternal barrier, comprising extended epitheliochorial and haemochorial zones, such as hemophagous organs for iron supply and histiotrophe uptake and a yolk sac placenta.ConclusionsBecause of the foundational mechanisms that lead to the considerable complexity of fetomaternal contact zones in carnivores have not been studied, carnivores are interesting animal models for interhaemal barrier differentiation.
Highlights
Placental research in carnivores has concentrated on domestic species, which have zonary, labyrinthine placentas with an endotheliochorial barrier
Because of the foundational mechanisms that lead to the considerable complexity of fetomaternal contact zones in carnivores have not been studied, carnivores are interesting animal models for interhaemal barrier differentiation
Extended non-invasive, non-villous, fetomaternal contact zones similar to what is observed in epitheliochorial placentas are widespread in carnivores [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21] and are known as the polar zone of the paraplacenta [7]
Summary
Placental research in carnivores has concentrated on domestic species, which have zonary, labyrinthine placentas with an endotheliochorial barrier. Carnivores are regarded as having zonary, labyrinthine placentas with an endotheliochorial barrier. Placental research in carnivores has mainly concentrated on domestic dogs and cats [4,5,6,7,8,9,10,11], rather than other species (e.g., [12,13,14]). Especially on wildlife species, is essential to morphological and molecular phylogenetics [25,26]. We use the terminology of phylogenetic systematics [27] in differentiating between derived character conditions and ancestral ones, with special reference to ancient conditions or the stem species patterns of Carnivora
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
