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- W1972799287 abstract "We reevaluate a recent suggestion that the extra-embryonic membranes of the amniotic egg do not constitute an adaptation to reproduction on land, but rather appeared in an embryo-retaining ancestor, in which they facilitated interactions between the embryo and the mother. On the basis of a revised data set on the distribution of extended embryo retention in sarcopterygians, we suggest that stem-amniotes probably did not retain their eggs in utero for a great proportion of the embryonic development. Therefore, we tentatively reject the hypothesis that the initial function of the extra-embryonic membranes was to facilitate embryo-mother interactions. However, current controversies on amniote phylogeny render our conclusions tentative. Nous évaluons une hypothèse récente selon laquelle les membranes extra-embryonnaires de l'œuf amniotique ne constituent pas une adaptation à la reproduction en milieu terrestre, mais qu'elles sont plutôt apparues chez un ancêtre qui pondait ses œufs à un stade de développement relativement tardif, chez qui elles auraient facilité des interactions entre l'embryon et sa mère. Une optimisation basée sur une nouvelle compilation de données sur la rétention d'embryons parmi les sarcoptérygiens suggère que les amniotes-souches pondaient probablement leurs œufs à des stades précoces de développement. L'hypothèse selon laquelle le rôle initial des membranes extra-embryonnaires était de faciliter des interactions entre la mère et l'embryon est donc rejetée. Cependant, des controverses actuelles sur la phylogénie des amniotes rendent ces conclusions incertaines." @default.
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- W1972799287 date "1999-07-01" @default.
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- W1972799287 title "Embryo retention in sarcopterygians, and the origin of the extra-embryonic membranes of the amniotic egg" @default.
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- W1972799287 doi "https://doi.org/10.1016/s0003-4339(00)86974-9" @default.
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