https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0088640
" This exceptional specimen captures an articulated embryo in birth position, with its skull just emerged from the maternal pelvis. Its headfirst birth posture, which is unlikely to be a breech condition, strongly indicates a terrestrial origin of viviparity, in contrast to the traditional view."
OU:
http://www.wikiwand.com/en/Timeline_of_ichthyosaur_research
"Skeletal reconstruction of a Stenopterygius with young partially evacuated from the birth canal. These specimens may not reflect the preservation of mothers in the act of giving birth, but deceased feti being expelled from her by pressure resulting from gas build up in her bloating carcass."
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Heureusement qu'il y a une espèce bien documenté;
et pour la quelle les paramètre ne sont pas les même
https://www.ledauphine.com/france-monde/2018/04/02/un-foetus-ne-apres-l-enterrement-de-sa-mere
https://journals.openedition.org/bmsap/352
Je sais, c'est moins beau vu sous cet angle( Il y a eu un travail ou l'implosion était envisagé! Je vous rassure; uniquement pour les Ichtyosaure,,, )